Nissan 2010 Sentra Owners Manual SM0E 1B16U1(MTC)
2015-10-23
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AIR CONDITIONER SECTION MTC MANUAL AIR CONDITIONER A B C D E CONTENTS SERVICE INFORMATION ............................ 3 Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT PRE-TENSIONER" ................................................................... 3 Precaution Necessary for Steering Wheel Rotation After Battery Disconnect ..................................... 3 Precaution for Working with HFC-134a (R-134a)...... 4 Contaminated Refrigerant ......................................... 4 General Refrigerant Precaution ................................ 4 Precaution for Leak Detection Dye ........................... 5 A/C Identification Label ............................................. 5 Precaution for Refrigerant Connection ...................... 5 Precaution for Service of Compressor ...................... 9 Precaution for Service Equipment ............................. 9 Schematic ................................................................31 Wiring Diagram - HEATER - ....................................32 Wiring Diagram - A/C,M - ........................................34 Front Air Control Terminal and Reference Value ....36 Operational Check ...................................................38 Power Supply and Ground Circuit for Front Air Control .....................................................................39 LAN System Circuit .................................................41 Mode Door Motor Circuit .........................................43 Air Mix Door Motor Circuit .......................................45 Intake Door Motor Circuit .........................................47 Blower Motor Circuit ................................................48 Magnet Clutch Circuit (If Equipped) .........................53 Insufficient Cooling ..................................................56 Insufficient Heating ..................................................63 Noise .......................................................................64 PREPARATION ..................................................12 CONTROL UNIT ................................................ 66 HFC-134a (R-134a) Service Tool and Equipment.... 12 Commercial Service Tool ........................................ 14 Removal and Installation .........................................66 PRECAUTIONS ................................................... 3 REFRIGERATION SYSTEM ..............................16 FRONT BLOWER MOTOR ............................... 67 Removal and Installation .........................................67 Refrigerant Cycle .................................................... 16 Refrigerant System Protection ................................ 16 Component Part Location ....................................... 17 IN-CABIN MICROFILTER ................................. 68 OIL ......................................................................18 HEATER & COOLING UNIT ASSEMBLY ........ 70 Removal and Installation .........................................68 Maintenance of Oil Quantity in Compressor ........... 18 Removal and Installation .........................................70 AIR CONDITIONER CONTROL .........................21 HEATER CORE ................................................. 72 Overview Air Conditioner LAN Control System ....... 21 System Construction ............................................... 21 Overview of Control system .................................... 23 Control Operation .................................................... 24 Discharge Air Flow .................................................. 25 System Description ................................................. 25 TROUBLE DIAGNOSIS .....................................27 How to Perform Trouble Diagnosis for Quick and Accurate Repair ...................................................... 27 Component Parts and Harness Connector Location .......................................................................... 27 Revision: January 2010 F G H I MTC K L M N Removal and Installation .........................................72 INTAKE DOOR MOTOR ................................... 73 O Removal and Installation .........................................73 MODE DOOR MOTOR ...................................... 74 Removal and Installation .........................................74 AIR MIX DOOR MOTOR ................................... 75 Removal and Installation .........................................75 FAN CONTROL AMPLIFIER ............................ 76 Removal and Installation .........................................76 MTC-1 2010 Sentra P DUCTS AND GRILLES ...................................... 77 Removal and Installation ........................................ 77 REFRIGERANT LINES ...................................... 81 HFC-134a (R-134a) Service Procedure ................. 81 Component ............................................................. 83 Removal and Installation for Compressor MR20DE ................................................................. 85 Removal and Installation for Compressor QR25DE ................................................................. 86 Removal and Installation for Low-Pressure Flexible Hose and Muffler Pipe ...................................... 87 Removal and Installation for High-pressure Flexible Hose ................................................................. 87 Removal and Installation for High-pressure Pipe ... 87 Revision: January 2010 Removal and Installation for Refrigerant Pressure Sensor ..................................................................... 88 Removal and Installation for Condenser ................. 88 Removal and Installation for Evaporator ................. 89 Removal and Installation for Expansion Valve ........ 90 Checking of Refrigerant Leaks ................................ 90 Checking System for Leaks Using the Fluorescent Leak Detector .......................................................... 90 Dye Injection ........................................................... 91 Electronic Refrigerant Leak Detector ...................... 91 SERVICE DATA AND SPECIFICATIONS (SDS) ................................................................. 94 Service Data and Specification (SDS) .................... 94 MTC-2 2010 Sentra PRECAUTIONS < SERVICE INFORMATION > SERVICE INFORMATION A PRECAUTIONS Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT PRE-TENSIONER" B INFOID:0000000005602372 The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted. Information necessary to service the system safely is included in the SRS and SB section of this Service Manual. WARNING: • To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in the event of a collision which would result in air bag inflation, all maintenance must be performed by an authorized NISSAN/INFINITI dealer. • Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag Module, see the SRS section. • Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or harness connectors. C D E F G H PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS WARNING: • When working near the Airbag Diagnosis Sensor Unit or other Airbag System sensors with the IgniI tion ON or engine running, DO NOT use air or electric power tools or strike near the sensor(s) with a hammer. Heavy vibration could activate the sensor(s) and deploy the air bag(s), possibly causing serious injury. • When using air or electric power tools or hammers, always switch the Ignition OFF, disconnect the MTC battery, and wait at least 3 minutes before performing any service. Precaution Necessary for Steering Wheel Rotation After Battery Disconnect INFOID:0000000005602373 NOTE: • This Procedure is applied only to models with Intelligent Key system and NATS (NISSAN ANTI-THEFT SYSTEM). • Remove and install all control units after disconnecting both battery cables with the ignition knob in the ″LOCK″ position. • Always use CONSULT-III to perform self-diagnosis as a part of each function inspection after finishing work. If DTC is detected, perform trouble diagnosis according to self-diagnostic results. For models equipped with the Intelligent Key system and NATS, an electrically controlled steering lock mechanism is adopted on the key cylinder. For this reason, if the battery is disconnected or if the battery is discharged, the steering wheel will lock and steering wheel rotation will become impossible. If steering wheel rotation is required when battery power is interrupted, follow the procedure below before starting the repair operation. K L M N O OPERATION PROCEDURE 1. 2. 3. 4. Connect both battery cables. NOTE: Supply power using jumper cables if battery is discharged. Use the Intelligent Key or mechanical key to turn the ignition switch to the ″ACC″ position. At this time, the steering lock will be released. Disconnect both battery cables. The steering lock will remain released and the steering wheel can be rotated. Perform the necessary repair operation. Revision: January 2010 MTC-3 2010 Sentra P PRECAUTIONS < SERVICE INFORMATION > 5. When the repair work is completed, return the ignition switch to the ″LOCK″ position before connecting the battery cables. (At this time, the steering lock mechanism will engage.) 6. Perform a self-diagnosis check of all control units using CONSULT-III. Precaution for Working with HFC-134a (R-134a) INFOID:0000000005282755 WARNING: • CFC-12 (R-12) refrigerant and HFC-134a (R-134a) refrigerant are not compatible. If the refrigerants are mixed compressor failure is likely to occur. Refer to MTC-4, "Contaminated Refrigerant". To determine the purity of HFC-134a (R-134a) in the vehicle and recovery tank, use Refrigerant Recovery/Recycling Recharging equipment and Refrigerant Identifier. • Use only specified oil for the HFC-134a (R-134a) A/C system and HFC-134a (R-134a) components. If oil other than that specified is used, compressor failure is likely to occur. • The specified HFC-134a (R-134a) oil rapidly absorbs moisture from the atmosphere. The following handling precautions must be observed: - When removing refrigerant components from a vehicle, immediately cap (seal) the component to minimize the entry of moisture from the atmosphere. - When installing refrigerant components to a vehicle, do not remove the caps (unseal) until just before connecting the components. Connect all refrigerant loop components as quickly as possible to minimize the entry of moisture into system. - Only use the specified oil from a sealed container. Immediately reseal containers of oil. Without proper sealing, oil will become moisture saturated and should not be used. - Avoid breathing A/C refrigerant and oil vapor or mist. Exposure may irritate eyes, nose and throat. Remove HFC-134a (R-134a) from the A/C system using certified service equipment meeting requirements of SAE J2210 [HFC-134a (R-134a) recycling equipment], or J2209 [HFC-134a (R-134a) recycling equipment], If accidental system discharge occurs, ventilate work area before resuming service. Additional health and safety information may be obtained from refrigerant and oil manufacturers. - Do not allow A/C oil to come in contact with styrofoam parts. Damage may result. Contaminated Refrigerant INFOID:0000000005282756 If a refrigerant other than pure HFC-134a (R-134a) is identified in a vehicle, your options are: • Explain to the customer that environmental regulations prohibit the release of contaminated refrigerant into the atmosphere. • Explain that recovery of the contaminated refrigerant could damage your service equipment and refrigerant supply. • Suggest the customer return the vehicle to the location of previous service where the contamination may have occurred. • If you choose to perform the repair, recover the refrigerant using only dedicated equipment and containers. Do not recover contaminated refrigerant into your existing service equipment. If your facility does not have dedicated recovery equipment, you may contact a local refrigerant product retailer for available service. This refrigerant must be disposed of in accordance with all federal and local regulations. In addition, replacement of all refrigerant system components on the vehicle is recommended. • If the vehicle is within the warranty period, the air conditioner warranty is void. Please contact NISSAN Customer Affairs for further assistance. General Refrigerant Precaution INFOID:0000000005282757 WARNING: • Do not release refrigerant into the air. Use approved recovery/recycling equipment to capture the refrigerant every time an air conditioning system is discharged. • Always wear eye and hand protection (goggles and gloves) when working with any refrigerant or air conditioning system. • Do not store or heat refrigerant containers above 52°C (125°F). • Do not heat a refrigerant container with an open flame; if container warming is required, place the bottom of the container in a warm pail of water. • Do not intentionally drop, puncture, or incinerate refrigerant containers. • Keep refrigerant away from open flames: poisonous gas will be produced if refrigerant burns. • Refrigerant will displace oxygen, therefore be certain to work in well ventilated areas to prevent suffocation. Revision: January 2010 MTC-4 2010 Sentra PRECAUTIONS < SERVICE INFORMATION > • Do not pressure test or leak test HFC-134a (R-134a) service equipment and/or vehicle air conditioning systems with compressed air during repair. Some mixtures of air and HFC-134a (R-134a) have been shown to be combustible at elevated pressures. These mixtures, if ignited, may cause injury or property damage. Additional health and safety information may be obtained from refrigerant manufacturers. Precaution for Leak Detection Dye A B INFOID:0000000005282758 • The A/C system contains a fluorescent leak detection dye used for locating refrigerant leaks. An ultraviolet (UV) lamp is required to illuminate the dye when inspecting for leaks. • Always wear fluorescence enhancing UV safety goggles to protect your eyes and enhance the visibility of the fluorescent dye. • A compressor shaft seal should not be repaired because of dye seepage. The compressor shaft seal should only be repaired after confirming the leak with an electronic refrigerant leak detector (J-41995). • Always remove any dye from the leak area after repairs are complete to avoid a misdiagnosis during a future service. • Do not allow dye to come into contact with painted body panels or interior components. If dye is spilled, clean immediately with the approved dye cleaner. Fluorescent dye left on a surface for an extended period of time cannot be removed. • Do not spray the fluorescent dye cleaning agent on hot surfaces (engine exhaust manifold, etc.). • Do not use more than one refrigerant dye bottle (1/4 ounce / 7.4 cc) per A/C system. • Leak detection dyes for HFC-134a (R-134a) and CFC-12 (R-12) A/C systems are different. Do not use HFC134a (R-134a) leak detection dye in CFC-12 (R-12) A/C systems or CFC-12 (R-12) leak detection dye in HFC-134a (R-134a) A/C systems or A/C system damage may result. • The fluorescent properties of the dye will remain for over three (3) years unless a compressor failure occurs. A/C Identification Label INFOID:0000000005282759 C D E F G H Vehicles with factory installed fluorescent dye have this green identification label on the underside of hood. Precaution for Refrigerant Connection INFOID:0000000005282760 A new type refrigerant connection has been introduced to all refrigerant lines except the following locations. • Expansion valve to cooling unit • Evaporator pipes to evaporator (inside cooling unit) • Refrigerant pressure sensor I MTC FEATURES OF NEW TYPE REFRIGERANT CONNECTION K • The O-ring has been relocated. It has also been provided with a groove for proper installation. This eliminates the chance of the O-ring being caught in, or damaged by, the mating part. The sealing direction of the O-ring is now set vertically in relation to the contacting surface of the mating part to improve sealing characteristics. • The reaction force of the O-ring will not occur in the direction that causes the joint to pull out, thereby facilitating piping connections. L M N O P SHA815E Revision: January 2010 MTC-5 2010 Sentra PRECAUTIONS < SERVICE INFORMATION > O-RING AND REFRIGERANT CONNECTION MR20DE AWIIA1293GB 1. High-pressure pipe 2. Condenser 3. Liquid tank 4. High-pressure flexible hose 5. Compressor 6. Low-pressure flexible hose 7. Heater and cooling unit assembly 8. Drain hose W. Refrigerant leak checking order X. Tightening torque (A-C) Y. Wrench size Z. O-ring size Revision: January 2010 MTC-6 2010 Sentra PRECAUTIONS < SERVICE INFORMATION > QR25DE A B C D E F G H I MTC K L M N O AWIIA1294GB P 1. High-pressure pipe 2. Condenser 3. Liquid tank 4. High-pressure flexible hose 5. Compressor 6. Muffler pipe 7. Low-pressure flexible hose 8. Drain hose 9. Heater and cooling unit assembly W. Refrigerant leak checking order X. Tightening torque (A-C) Y. Wrench size Z. O-ring size CAUTION: Revision: January 2010 MTC-7 2010 Sentra PRECAUTIONS < SERVICE INFORMATION > The new and former refrigerant connections use different O-ring configurations. Do not confuse Orings since they are not interchangeable. If a wrong O-ring is installed, refrigerant will leak at, or around, the connection. O-Ring Part Numbers and Specifications Connection type O-ring size Part number* D New 8 92471 N8210 6.8 (0.268) 1.85 (0.0728) Former 10 J2476 89956 9.25 (0.3642) 1.78 (0.0701) 92472 N8210 10.9 (0.429) 2.43 (0.0957) 92475 71L00 11.0 (0.433) 2.4 (0.094) 92473 N8210 13.6 (0.535) 2.43 (0.0957) New Former New Former New SHA814E Former New 12 16 19 24 mm (in) W mm (in) 92475 72L00 14.3 (0.563) 2.3 (0.091) 92474 N8210 16.5 (0.650) 2.43 (0.0957) 92477 N8200 17.12 (0.6740) 1.78 (0.0701) 92195 AH300 21.8 (0.858) 2.4 (0.094) *: Always check with the Parts Department for the latest parts information. WARNING: Make sure all refrigerant is discharged into the recycling equipment and the pressure in the system is less than atmospheric pressure. Then gradually loosen the discharge side hose fitting and remove it. CAUTION: When replacing or cleaning refrigerant cycle components, observe the following. • When the compressor is removed, store it in the same position as it is when mounted on the car. Failure to do so will cause oil to enter the low pressure chamber. • When connecting tubes, always use a torque wrench and a back-up wrench. • After disconnecting tubes, immediately plug all openings to prevent entry of dirt and moisture. • When installing an air conditioner in the vehicle, connect the pipes as the final stage of the operation. Do not remove the seal caps of pipes and other components until just before required for connection. • Allow components stored in cool areas to warm to working area temperature before removing seal caps. This prevents condensation from forming inside A/C components. • Thoroughly remove moisture from the refrigeration system before charging the refrigerant. • Always replace used O-rings. • When connecting tube, apply oil to circle of the O-rings shown in illustration. Be careful not to apply oil to threaded portion. Oil name: NISSAN A/C System Oil Type S or equivalent • O-ring must be closely attached to grooved portion of tube. • When replacing the O-ring, be careful not to damage O-ring and tube. • Connect tube until you hear it click, then tighten the nut or bolt by hand until snug. Make sure that the O-ring is installed to tube correctly. Revision: January 2010 MTC-8 2010 Sentra PRECAUTIONS < SERVICE INFORMATION > • After connecting line, conduct leak test and make sure that there is no leakage from connections. When the gas leaking point is found, disconnect that line and replace the O-ring. Then tighten connections of seal seat to the specified torque. A B C D E F RHA861F Precaution for Service of Compressor INFOID:0000000005282761 G • Plug all openings to prevent moisture and foreign matter from entering. • When the compressor is removed, store it in the same position as it is when mounted on the car. H • When replacing or repairing compressor, follow “Maintenance of Oil Quantity in Compressor” exactly. Refer to MTC-18, "Maintenance of Oil Quantity in Compressor". • Keep friction surfaces between clutch and pulley clean. If the surface is contaminated, with oil, wipe I it off by using a clean waste cloth moistened with thinner. • After compressor service operation, turn the compressor shaft by hand more than 5 turns in both directions. This will equally distribute oil inside the compressor. After the compressor is installed, let the engine idle and operate the compressor for 1 hour. MTC • After replacing the compressor magnet clutch, apply voltage to the new one and check for normal operation. [Gap between clutch disc and pulley is 0.3 - 0.6 mm (0.012 - 0.024 in)] Precaution for Service Equipment INFOID:0000000005282762 K RECOVERY/RECYCLING EQUIPMENT Follow the manufacturer's instructions for machine operation and machine maintenance. Never introduce any refrigerant other than that specified into the machine. ELECTRONIC LEAK DETECTOR L M Follow the manufacturer's instructions for tester operation and tester maintenance. VACUUM PUMP N O P Revision: January 2010 MTC-9 2010 Sentra PRECAUTIONS < SERVICE INFORMATION > The oil contained inside the vacuum pump is not compatible with the specified oil for HFC-134a (R-134a) A/C systems. The vent side of the vacuum pump is exposed to atmospheric pressure so the vacuum pump oil may migrate out of the pump into the service hose. This is possible when the pump is switched off after evacuation (vacuuming) and hose is connected to it. To prevent this migration, use a manual valve situated near the hose-to-pump connection, as follows. • Usually vacuum pumps have a manual isolator valve as part of the pump. Close this valve to isolate the service hose from the pump. • For pumps without an isolator, use a hose equipped with a manual shut-off valve near the pump end. Close the valve to isolate the hose from the pump. • If the hose has an automatic shut off valve, disconnect the hose from the pump: as long as the hose is connected, the valve is open and lubricating oil may migrate. Some one-way valves open when vacuum is applied and close under a no vacuum condition. Such valves may restrict the pump's ability to pull a deep vacuum and are not recommended. RHA270D MANIFOLD GAUGE SET Be certain that the gauge face indicates R-134a or 134a. Make sure the gauge set has 1/2″-16 ACME threaded connections for service hoses. Confirm the set has been used only with refrigerant HFC134a (R-134a) along with specified oil. SHA533D SERVICE HOSES Be certain that the service hoses display the markings described (colored hose with black stripe). All hoses must include positive shutoff devices (either manual or automatic) near the end of the hoses opposite the manifold gauge. RHA272D SERVICE COUPLERS Revision: January 2010 MTC-10 2010 Sentra PRECAUTIONS < SERVICE INFORMATION > Never attempt to connect HFC-134a (R-134a) service couplers to a CFC-12 (R-12) A/C system. The HFC-134a (R-134a) couplers will not properly connect to the CFC-12 (R-12) system. However, if an improper connection is attempted, discharging and contamination may occur. Shut-off valve rotation A B A/C service valve Clockwise Open Counterclockwise Close C RHA273D D REFRIGERANT WEIGHT SCALE Verify that no refrigerant other than HFC134a (R-134a) and specified oils have been used with the scale. If the scale controls refrigerant flow electronically, the hose fitting must be 1/2”-16 ACME. E F G RHA274D CHARGING CYLINDER H Using a charging cylinder is not recommended. Refrigerant may be vented into air from cylinder's top valve when filling the cylinder with refrigerant. Also, the accuracy of the cylinder is generally less than that of an electronic scale or of quality recycle/recharge equipment. I MTC K L M N O P Revision: January 2010 MTC-11 2010 Sentra PREPARATION < SERVICE INFORMATION > PREPARATION HFC-134a (R-134a) Service Tool and Equipment INFOID:0000000005282763 Never mix HFC-134a refrigerant and/or its specified oil with CFC-12 (R-12) refrigerant and/or its oil. Separate and non-interchangeable service equipment must be used for handling each type of refrigerant/oil. Refrigerant container fittings, service hose fittings and service equipment fittings (equipment which handles refrigerant and/or oil) are different between CFC-12 (R-12) and HFC-134a (R-134a). This is to avoid mixed use of the refrigerants/oil. Adapters that convert one size fitting to another must never be used: refrigerant/oil contamination will occur and compressor failure will result. Tool number (Kent-Moore No.) Tool name Description — ( — ) Refrigerant HFC-134a (R-134a) Container color: Light blue Container marking: HFC-134a (R134a) Fitting size: Thread size • large container 1/2 in -16 ACME S-NT196 — ( — ) Genuine NISSAN A/C System Oil Type S Type: Poly alkaline glycol oil (PAG), type S Application: HFC-134a (R-134a) swash plate compressors (NISSAN only) Lubricity: 40 m (1.4 US fl oz, 1.4 Imp fl oz) S-NT197 Refrigerant recovery, recycling and recharging K991J0130 (ACR2005-NI) ACR A/C Service Center WJIA0293E — (J-41995) Electronic refrigerant leak detector Power supply: DC 12V (Battery terminal) AHA281A Revision: January 2010 MTC-12 2010 Sentra PREPARATION < SERVICE INFORMATION > Tool number (Kent-Moore No.) Tool name Description — (J-43926) Refrigerant dye leak detection kit Kit includes: (J-42220) UV lamp and UV safety goggles (J-41459) Refrigerant dye injector (J-41447) qty. 24 HFC-134a (R-134a) refrigerant dye (J-43872) Refrigerant dye cleaner Power supply: DC 12V (Battery terminal) A B C D ZHA200H — (J-42220) Fluorescent dye leak detector Power supply: DC 12V (Battery terminal) For checking refrigerant leak when fluorescent dye is installed in A/C system. Includes: UV lamp and UV safety goggles E F G SHA438F Application: For HFC-134a (R-134a) PAG oil Container: 1/4 ounce (7.4cc) bottle (Includes self-adhesive dye identification labels for affixing to vehicle after charging system with dye.) — (J-41447) HFC-134a (R-134a) Fluorescent leak detection dye (Box of 24, 1/4 ounce bottles) H I SHA439F — (J-41459) HFC-134a (R-134a) Dye injector Use with J-41447, 1/4 ounce bottle For injecting 1/4 ounce of fluorescent leak detection dye into A/C system. MTC K L SHA440F — (J-43872) Refrigerant dye cleaner For cleaning dye spills. M N SHA441F — (J-39183-C) Manifold gauge set (with hoses and couplers) Identification: • The gauge face indicates R-134a. Fitting size: Thread size • 1/2 in -16 ACME O P RJIA0196E Revision: January 2010 MTC-13 2010 Sentra PREPARATION < SERVICE INFORMATION > Tool number (Kent-Moore No.) Tool name Description Service hoses • (J-39500-72B) High side hose • (J-39500-72R) Low side hose • (J-39500-72Y) Utility hose Hose color: • Low side hose: Blue with black stripe • High side hose: Red with black stripe • Utility hose: Yellow with black stripe or green with black stripe Hose fitting to gauge: • 1/2 in -16 ACME S-NT201 Service couplers • (J-39500-20A) High side coupler • (J-39500-24A) Low side coupler Hose fitting to service hose: • M14 x 1.5 fitting is optional or permanently attached. S-NT202 — (J-39649) Vacuum pump (Including the isolator valve) Capacity: • Air displacement: 4 CFM • Micron rating: 20 microns • Oil capacity: 482 g (17 oz) Fitting size: Thread size • 1/2 in -16 ACME S-NT203 — ( J-46534 ) Trim tool set For removing trim AWJIA0483ZZ — (J-41425-NIS) Aluminum tube repair kit Repairing leaks in A/C tubes ALIIA0390ZZ Commercial Service Tool Revision: January 2010 INFOID:0000000005282764 MTC-14 2010 Sentra PREPARATION < SERVICE INFORMATION > Tool number Tool name Description J-41810-NI Refrigerant identifier equipment HFC 134a (R-134a) Checking refrigerant purity and system contamination A B C D RJIA0197E Power tool Removing bolts and nuts E F PIIB1407E G H I MTC K L M N O P Revision: January 2010 MTC-15 2010 Sentra REFRIGERATION SYSTEM < SERVICE INFORMATION > REFRIGERATION SYSTEM Refrigerant Cycle INFOID:0000000005282765 REFRIGERANT FLOW WJIA2295E 1. Pressure relief valve 2. Compressor 3. Refrigerant pressure sensor 4. Condenser (with liquid tank) 5. Expansion valve 6. Evaporator 7. Front blower motor A. High-pressure gas B. High-pressure liquid C. Low-pressure liquid D. Low-pressure gas E. Outside air The refrigerant flows in the standard pattern, that is, through the compressor, the condenser with liquid tank, through the evaporator, and back to the compressor. The refrigerant evaporation through the evaporator coil is controlled by an externally equalized expansion valve, located inside the evaporator case. Refrigerant System Protection INFOID:0000000005282766 REFRIGERANT PRESSURE SENSOR The refrigerant system is protected against excessively high or low pressures by the refrigerant pressure sensor, located on the liquid tank. If the system pressure rises above or falls below the specifications, the refrigerant pressure sensor detects the pressure inside the refrigerant line and sends the voltage signal to the ECM. The ECM then signals the BCM (via CAN communication lines) to cease suppling power to the A/C relay which disengages and stops the compressor. This occurs when pressure on the high pressure side (as detected by refrigerant pressure sensor) is over approximately 2,746 kPa (28 kg/cm2, 398 psi), or below approximately 120 kPa (1.22 kg/cm2, 17.4 psi). PRESSURE RELIEF VALVE The refrigerant system is also protected by a pressure relief valve, located in the rear head of the compressor. When the refrigerant pressure in the system increases to an abnormal level [more than 3,600 kPa (36.7 kg/ cm2, 522 psi)], the release port on the pressure relief valve automatically opens and releases refrigerant into the atmosphere. Revision: January 2010 MTC-16 2010 Sentra REFRIGERATION SYSTEM < SERVICE INFORMATION > Component Part Location INFOID:0000000005282767 A B C D E F G H I MTC K L M N O P BJIA0023E 1. Defroster nozzle 2. Side ventilator duct (LH) 3. Side defroster duct (LH) 4. Front foot duct (LH) 5. Rear floor connector duct (Canada only) 6. Rear floor duct (LH) (Canada only) 7. Rear floor duct (RH) (Canada only) 8. Front foot duct (RH) 9. Heater and cooling unit assembly 10. Side defroster duct (RH) Revision: January 2010 11. Side ventilator duct (RH) MTC-17 2010 Sentra OIL < SERVICE INFORMATION > OIL Maintenance of Oil Quantity in Compressor INFOID:0000000005282768 The oil in the compressor circulates through the system with the refrigerant. Add oil to compressor when replacing any component or after a large refrigerant leakage has occurred. It is important to maintain the specified amount. If oil quantity is not maintained properly, the following malfunctions may result: • Lack of oil: May lead to a seized compressor • Excessive oil: Inadequate cooling (thermal exchange interference) OIL • Oil type: NISSAN A/C System Oil Type S or equivalent CHECKING AND ADJUSTING CAUTION: If excessive oil leakage is noted, do not perform the oil return operation. Start the engine and set the following conditions: Test Condition • Engine speed: Idling to 1,200 rpm • A/C switch: On • Blower fan speed: Max. position • Temp. control: Optional [Set so that intake air temperature is 25° to 30° C (77° to 86°F).] • Intake position: Recirculation ( ) • Perform oil return operation for about ten minutes Adjust the oil quantity according to the following table. Oil Adjusting Procedure for Components Replacement Except Compressor After replacing any of the following major components, add the correct amount of oil to the system. Amount of Oil to be Added Oil to be added to system Part replaced m Amount of oil (US fl oz, Imp fl oz) Remarks Evaporator 75 (2.5, 2.6) — Condenser 75 (2.5, 2.6) — Liquid tank 5 (0.2, 0.2) Add if compressor is not replaced. 30 (1.0, 1.1) Large leak — Small leak *1 In case of refrigerant leak *1: If refrigerant leak is small, no addition of oil is needed. Oil Adjustment Procedure for Compressor Replacement Revision: January 2010 MTC-18 2010 Sentra OIL < SERVICE INFORMATION > A B C D E F G H I WJIA1716E 1. New compressor 2. Old compressor 3. Recovery/recycling equipment 4. Measuring cup X 5. Measuring cup Y 6. New oil A. Drain oil from the new compressor into clean container B. Record amount of oil recovered C. Add an additional 5 m (0.2 US fl oz, 0.2 Imp fl oz) of new oil when replacing liquid tank D. 1. 2. 3. 4. 5. 6. 7. 8. 9. MTC K Install new oil equal to recorded amounts in measuring cups X plus Y Before connecting recovery/recycling equipment to vehicle, check recovery/recycling equipment gauges. No refrigerant pressure should be displayed. If NG, recover refrigerant from equipment lines. Connect recovery/recycling equipment to vehicle. Confirm refrigerant purity in supply tank using recovery/ recycling equipment and refrigerant identifier. If NG, refer to MTC-4, "Contaminated Refrigerant". Confirm refrigerant purity in vehicle A/C system using recovery/recycling equipment and refrigerant identifier. If NG, refer to MTC-4, "Contaminated Refrigerant". Discharge refrigerant into the refrigerant recovery/recycling equipment. Measure oil discharged into the recovery/recycling equipment. Drain the oil from the “old” (removed) compressor into a graduated container and recover the amount of oil drained. Drain the oil from the “new” compressor into a separate, clean container. Measure an amount of new oil installed equal to amount drained from “old” compressor. Add this oil to “new” compressor through the suction port opening. Measure an amount of new oil equal to the amount recovered during discharging. Add this oil to “new” compressor through the suction port opening. If the liquid tank also needs to be replaced, add an additional 5 m (0.2 US fl oz, 0.2 Imp fl oz) of oil at this time. CAUTION: Revision: January 2010 MTC-19 2010 Sentra L M N O P OIL < SERVICE INFORMATION > Do not add this 5 m (0.2 US fl oz, 0.2 Imp fl oz) of oil if only replacing the compressor and not the liquid tank. Revision: January 2010 MTC-20 2010 Sentra AIR CONDITIONER CONTROL < SERVICE INFORMATION > AIR CONDITIONER CONTROL Overview Air Conditioner LAN Control System A INFOID:0000000005282769 The LAN (local area network) system consists of front air control, air mix door motor, intake door motor, and mode door motor. A configuration of these components is shown in the diagram below. B C D E WJIA0876E System Construction INFOID:0000000005282770 F A small network is constructed between the front air control, air mix door motor, intake door motor, and mode door motor. The front air control and motors are connected by data transmission lines and motor power supply G lines. The LAN network is built through the ground circuits of the two motors. Addresses, motor opening angle signals, motor stop signals and error checking messages are all transmitted through the data transmission lines connecting the front air control and each motor. The following functions are contained in LCUs built into the air mix door motor, intake door motor, and the H mode door motor. • Address • Motor opening angle signals I • Data transmission • Motor stop and drive decision • Opening angle sensor (PBR function) MTC • Comparison • Decision (front air control indicated value and motor opening angle comparison) K L M WJIA0877E Operation The front air control receives signals from its various dials and switches. The front air control then sends air mix door, mode door and intake door opening angle data to the air mix door motor LCU, mode door motor LCU and intake door motor LCU. The air mix door motor, mode door motor and intake door motor read their respective signals according to the address signal. Opening angle indication signals received from the front air control and each of the motor position sensors are compared by the LCUs in each motor with the existing decision and opening angles. Subse- N O P Revision: January 2010 MTC-21 2010 Sentra AIR CONDITIONER CONTROL < SERVICE INFORMATION > quently, HOT/COLD, DEFROST/VENT or FRESH/RECIRCULATION operation is selected. The new selection data is returned to the front air control. WJIA0878E Transmission Data and Transmission Order Front air control data is transmitted consecutively to each of the door motors following the form shown in figure below. Start: Initial compulsory signal sent to each of the door motors. Address: Data sent from the front air control is selected according to data-based decisions made by the air mix door motor, mode door motor and intake door motor. If the addresses are identical, the opening angle data and error check signals are received by the door motor LCUs. The LCUs then make the appropriate error decision. If the opening angle data is normal, door control begins. If an error exists, the received data is rejected and corrected data received. Finally, door control is based upon the corrected opening angle data. Opening angle: Data that shows the indicated door opening angle of each door motor. Error check: Procedure by which sent and received data is checked for errors. Error data is then compiled. The error check prevents corrupted data from being used by the air mix door motor, mode door motor and intake door motor. Error data can be related to the following problems. • Abnormal electrical frequency • Poor electrical connections • Interference from other signal transmission lines • Signal level fluctuation Stop signal: At the end of each transmission, a stop operation, in-operation, or internal problem message is delivered to the front air control. This completes one data transmission and control cycle. WJIA0882E Air Mix Door Control The air mix door is controlled by the front air control based on input from the temperature dial setting. Blower Speed Control Blower speed is controlled by the front air control based on the position of the blower control dial. With the blower control dial set to any position except OFF, the blower will begin to operate. Intake Door Control Revision: January 2010 MTC-22 2010 Sentra AIR CONDITIONER CONTROL < SERVICE INFORMATION > The intake door is controlled by the front air control based on input from the recirculation switch setting, and the MAX A/C switch setting. A Mode Door Control The mode door is controlled by the front air control based on input from the mode dial setting. B Magnet Clutch Control C D E F G WJIA2307E The ECM controls compressor operation using input signals from the throttle position sensor and front air control. Overview of Control system H INFOID:0000000005282771 I The control system consists of an input sensor, switches, the front air control and outputs. The relationship of these components is shown in the diagram below: MTC K L M N O P BJIA0003E Revision: January 2010 MTC-23 2010 Sentra AIR CONDITIONER CONTROL < SERVICE INFORMATION > Control Operation INFOID:0000000005282772 BJIA0004E 1. Temperature dial 2. Blower control dial 3. Recirculation switch 4. A/C switch (if equipped) 5. Rear window defogger switch 6. Mode dial AIR CONDITIONER (A/C) SWITCH (IF EQUIPPED) The air conditioner switch controls the A/C system. When the switch is pressed with the blower ON, the compressor will turn ON. The indicator lamp will also illuminate. The air conditioner cooling function operates only when the engine is running. TEMPERATURE DIAL (Potentio Temperature Control) Increases or decreases the set temperature. BLOWER CONTROL DIAL/OFF SWITCH Manually controls the blower speed. In the off position, the compressor and blower are OFF, the intake door is set to the chosen position, and the air mode doors are set to the chosen position. RECIRCULATION ( ) SWITCH OFF position: Outside air is drawn into the passenger compartment. ON position: Interior air is recirculated inside the vehicle. DEFROSTER SWITCH Positions the air mode doors to the defrost position. Also positions the intake doors to the outside air position. The compressor remains ON until the ignition is turned OFF or if the customer turns the mode to a non-defrost mode and turns the A/C button to OFF. MODE DIAL Controls the air discharge through control of mode door, also controls MAX A/C function. REAR WINDOW DEFOGGER SWITCH This switch turns the rear window defogger ON and OFF. Revision: January 2010 MTC-24 2010 Sentra AIR CONDITIONER CONTROL < SERVICE INFORMATION > Discharge Air Flow INFOID:0000000005282773 A B C D BJIA0006E E Air outlet/distribution Mode door position Vent Foot Defroster 100% — — 60% 40% — 10% 60% 30% 11% 50% 39% 15% — 85% F G H Airflow always present at driver and passenger side demisters System Description INFOID:0000000005282774 I SWITCHES AND THEIR CONTROL FUNCTION MTC K L M N RHA044GA O P Revision: January 2010 MTC-25 2010 Sentra AIR CONDITIONER CONTROL < SERVICE INFORMATION > WJIA2294E Revision: January 2010 MTC-26 2010 Sentra TROUBLE DIAGNOSIS < SERVICE INFORMATION > TROUBLE DIAGNOSIS A How to Perform Trouble Diagnosis for Quick and Accurate Repair INFOID:0000000005282775 WORK FLOW B C D E SHA900E *1: MTC-38, "Operational Check" F SYMPTOM TABLE Reference Page Symptom • A/C system does not come on. • Go to Trouble Diagnosis Procedure for A/C system. MTC-39 H • Air outlet does not change. • Mode door motor does not operate normally. • Discharge air temperature does not change. • Air mix door motor does not operate normally. G • Go to Trouble Diagnosis Procedure for Mode Door Motor. (LAN) MTC-43 I • Go to Trouble Diagnosis Procedure for Air Mix Door Motor. (LAN) MTC-45 MTC • Intake door does not change. • Intake door motor does not operate normally. • Go to Trouble Diagnosis Procedure for Intake Door Motor. (LAN) MTC-47 • Blower motor operation is malfunctioning. • Go to Trouble Diagnosis Procedure for Blower Motor. MTC-48 • Magnet clutch does not engage. • Go to Trouble Diagnosis Procedure for Magnet Clutch. MTC-53 • Insufficient cooling. • Go to Trouble Diagnosis Procedure for Insufficient Cooling. MTC-56 • Insufficient heating. • Go to Trouble Diagnosis Procedure for Insufficient Heating. MTC-63 • Noise. • Go to Trouble Diagnosis Procedure for Noise. MTC-64 Component Parts and Harness Connector Location K L M INFOID:0000000005282776 N ENGINE COMPARTMENT - QR25DE O P Revision: January 2010 MTC-27 2010 Sentra TROUBLE DIAGNOSIS < SERVICE INFORMATION > WJIA2303E 1. A/C relay (internal to the IPDM E/R) 2. A/C Compressor F3 3. Refrigerant pressure sensor E35 (view with grille removed) ENGINE COMPARTMENT - MR20DE Revision: January 2010 MTC-28 2010 Sentra TROUBLE DIAGNOSIS < SERVICE INFORMATION > A B C D E F G H I MTC K L M N AWIIA1310ZZ 1. A/C Compressor F3 (if equipped) 2. Refrigerant pressure sensor E35 (if equipped), (view with grille removed) 3. A/C relay (if equipped), (internal to the IPDM E/R) PASSENGER COMPARTMENT Revision: January 2010 O P MTC-29 2010 Sentra TROUBLE DIAGNOSIS < SERVICE INFORMATION > BJIA0012E 1. Front blower motor M62 2. Fan control amp. M52 3. Mode door motor M51 4. Front blower motor relay J1 5. Front air control M33 6. Air mix door motor M34 7. Intake door motor M48 Revision: January 2010 MTC-30 2010 Sentra TROUBLE DIAGNOSIS < SERVICE INFORMATION > Schematic INFOID:0000000005282777 A B C D E F G H I MTC K L M N O P WJWA0490E Revision: January 2010 MTC-31 2010 Sentra TROUBLE DIAGNOSIS < SERVICE INFORMATION > Wiring Diagram - HEATER - INFOID:0000000005282778 ABIWA0047GB Revision: January 2010 MTC-32 2010 Sentra TROUBLE DIAGNOSIS < SERVICE INFORMATION > A B C D E F G H I MTC K L M N O WJWA0501E P Revision: January 2010 MTC-33 2010 Sentra TROUBLE DIAGNOSIS < SERVICE INFORMATION > Wiring Diagram - A/C,M - INFOID:0000000005282779 ABIWA0050GB Revision: January 2010 MTC-34 2010 Sentra TROUBLE DIAGNOSIS < SERVICE INFORMATION > A B C D E F G H I MTC K L M N O WJWA0502E P Revision: January 2010 MTC-35 2010 Sentra TROUBLE DIAGNOSIS < SERVICE INFORMATION > AAIWA0069GB Front Air Control Terminal and Reference Value INFOID:0000000005282780 INSPECTION OF FRONT AIR CONTROL Revision: January 2010 MTC-36 2010 Sentra TROUBLE DIAGNOSIS < SERVICE INFORMATION > • Measure voltage between each terminal and body ground by following Terminals and Reference Value for front air control. A B C WJIA0909E D FRONT AIR CONTROL HARNESS CONNECTOR TERMINAL LAYOUT E F G BJIA0005E TERMINAL AND REFERENCE VALUES FOR FRONT AIR CONTROL H Terminal No. Wire color Item Ignition switch Condition Voltage (V) (Approx.) 1 W Power supply for BAT — — 12 2 BR Power supply for IGN — 12 3 B Ground — 0 18 P A/C LAN signal (with A/C) — 5.5 19 Y A/C PD Cut (with A/C) — 5 20 GR Sensor ground — 0 21 Y Power supply for IGN — 12 22 O Power supply for mode door motor, intake door motor, and air mix door motor — 12 23 R Light (+) 24 V Light (-) 36 R Blower motor feed back — Lighting switch Fan speed 37 L Fan control AMP. control signal 38 LG Rear defrost ON signal Defroster switch 39 SB Fan ON signal Fan Revision: January 2010 MTC-37 MTC K L OFF 0 1st position 12 — I M N 0 Low 7 - 10 Any speed except high 2.5 - 3 High 9- 10 ON 0 OFF 5 ON 0 OFF 5 O P 2010 Sentra TROUBLE DIAGNOSIS < SERVICE INFORMATION > Terminal No. 40 Wire color Item G Compressor ON signal (with A/C) Ignition switch Voltage (V) (Approx.) Condition Compressor ON 0 OFF 5 Operational Check INFOID:0000000005282781 The purpose of the operational check is to confirm that the system operates properly. Conditions : Engine running at normal operating temperature CHECKING BLOWER 1. 2. Turn blower control dial clockwise, blower should operate on low speed. Continue turning blower control dial clockwise, and continue checking blower speeds until all speeds are checked. 3. Leave blower on Maximum speed. If NG, go to MTC-48, "Blower Motor Circuit". If OK, continue the check. CHECKING DISCHARGE AIR 1. Turn mode door control dial to each position. 2. Confirm that discharge air comes out according to the air distribution table. Refer to MTC-25, "Discharge Air Flow". NOTE: Confirm that the compressor clutch is engaged (audio or visual inspection) and intake door is in the fresh ( ) position when the DEF is selected. Intake door position is checked in the next step. If NG, go to MTC-43, "Mode Door Motor Circuit", MTC-74, "Removal and Installation". If OK, continue the check. CHECKING RECIRCULATION 1. Press REC switch. Recirculation indicator should illuminate. 2. Press REC switch a second time. Recirculation indicator should turn off. 3. Listen for intake door position change (you should hear blower sound change slightly). If NG, go to MTC-47, "Intake Door Motor Circuit". If OK, continue with the check. CHECKING TEMPERATURE DECREASE 1. Turn temperature control dial counterclockwise to full cold position. 2. Check for cold air at discharge air outlets. If NG, go to MTC-56, "Insufficient Cooling". If OK, continue the check. CHECKING TEMPERATURE INCREASE 1. Turn temperature control dial clockwise to full hot position. 2. Check for hot air at discharge air outlets. If NG, go to MTC-63, "Insufficient Heating". If OK, continue the check. CHECKING A/C SWITCH (IF EQUIPPED) 1. Turn blower control dial to the desired position and push the air conditioner switch (if equipped) to turn ON the air conditioner. Revision: January 2010 MTC-38 2010 Sentra TROUBLE DIAGNOSIS < SERVICE INFORMATION > 2. Confirm that the A/C indicator lamp illuminates and that the compressor clutch engages (audio or visual inspection). If NG, go to MTC-39, "Power Supply and Ground Circuit for Front Air Control", then if necessary, MTC-53, "Magnet Clutch Circuit (If Equipped)". If all operational checks are OK (symptom can not be duplicated), go to GI-26, "How to Perform Efficient Diagnosis for an Electrical Incident" and perform tests as outlined to simulate driving condition environment. If symptom appears, refer to MTC-27, "How to Perform Trouble Diagnosis for Quick and Accurate Repair" and perform applicable trouble diagnosis procedures. Power Supply and Ground Circuit for Front Air Control A B C INFOID:0000000005282782 D SYMPTOM: • Heater and A/C system (if equipped) does not come on. INSPECTION FLOW E 1.CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK 1. Turn blower control dial to any speed. 2. Turn mode dial to vent ( ) position, and press A/C switch (if equipped). 3. Confirm that the compressor clutch engages (sound or visual inspection). Can a symptom be duplicated? YES >> GO TO 3. NO >> GO TO 2. F G 2.PERFORM COMPLETE OPERATIONAL CHECK Perform a complete operational check and check for any symptoms. Refer to MTC-38, "Operational Check". Can a symptom be duplicated? YES >> Refer to MTC-27, "How to Perform Trouble Diagnosis for Quick and Accurate Repair". NO >> System OK. H I 3.CHECK FOR SERVICE BULLETINS MTC Check for any service bulletins. >> GO TO 4. K 4.CHECK POWER AND GROUND CIRCUIT Check main power supply and ground circuit. Refer to "DIAGNOSTIC PROCEDURE". OK or NG OK >> System OK. NG >> Replace front air control. Refer to MTC-66, "Removal and Installation". L M COMPONENT DESCRIPTION FRONT AIR CONTROL The front air control has a built-in microcomputer which processes information sent from the temperature control dial, and various switches needed for air conditioner operation. The air mix door motor, mode door motor, intake door motor, blower motor and compressor are then controlled. N O P WJIA0917E POTENTIO TEMPERATURE CONTROL (PTC) The PTC is built into the front air control. DIAGNOSTIC PROCEDURE Revision: January 2010 MTC-39 2010 Sentra TROUBLE DIAGNOSIS < SERVICE INFORMATION > SYMPTOM: • Heater and A/C system (if equipped) does not come on. BJIA0007E 1.CHECK POWER SUPPLY CIRCUIT FOR FRONT AIR CONTROL 1. 2. 3. Disconnect front air control connector M33. Turn ignition switch ON. Check voltage between front air control connector M33 terminals 1, 2, and 21, and ground. Terminals (+) (-) Voltage (V) (Approx.) Body ground 12V Connector - Terminal M33-1 M33-2 M33-21 BJIA0008E OK or NG OK >> GO TO 2. NG >> Check the following. • 10A fuse [Nos. 12 and 19, located in the fuse block (J/B)] and 15A fuses [Nos. 10 and 11, located in the fuse block (J/B)]. • If fuses are OK, check for open circuit in wiring harness. Repair or replace as necessary. • If fuses are NG, replace fuse and check wiring harness for short circuit. Repair or replace as necessary. 2.CHECK BODY GROUND CIRCUIT FOR FRONT AIR CONTROL 1. 2. Turn ignition switch OFF. Check continuity between front air control connector M33 terminal 3 and ground. Terminal (+) Connector - Terminal M33-3 (-) Body ground Continuity Yes OK or NG OK >> • Replace front air control. Refer to MTC-66, "Removal and Installation". • Inspection End. NG >> Repair or replace harness. Revision: January 2010 MTC-40 BJIA0009E 2010 Sentra TROUBLE DIAGNOSIS < SERVICE INFORMATION > LAN System Circuit INFOID:0000000005282783 A SYMPTOM: Mode door motor, intake door motor and/or air mix door motor do not operate normally. B C D WJIA0883E DIAGNOSTIC PROCEDURE E 1.CHECK POWER SUPPLY FOR DOOR MOTORS 1. 2. Turn ignition switch ON. Check voltage between front air control connector M33 terminal 22 and ground. F Terminals (-) Voltage (V) (Approx.) Body ground 12V (+) Connector M33-22 OK or NG OK >> GO TO 2. NG >> Replace front air control. Refer to MTC-66, "Removal and Installation". G H BJIA0010E 2.CHECK SIGNAL FOR DOOR MOTORS I MTC Check voltage between front air control connector M33 terminal 18 and ground. K Terminals (+) Connector M33-18 (-) Voltage (V) (Approx.) Ground 5.5V OK or NG OK >> GO TO 3. NG >> Replace front air control. Refer to MTC-66, "Removal and Installation". L M BJIA0011E N 3.CHECK POWER SUPPLY FOR MOTOR Check voltage between mode door motor connector M51 terminal 1 and ground, between air mix door motor connector M34 terminal 1 and ground, and between intake door motor connector M48 terminal 1 and ground. O P WJIA0038E Revision: January 2010 MTC-41 2010 Sentra TROUBLE DIAGNOSIS < SERVICE INFORMATION > Terminals Door motors (+) Connector Mode M51-1 Air mix M34-1 Intake M48-1 Voltage (V) (Approx.) (-) Body ground 12V OK or NG OK >> GO TO 4. NG >> Replace harness or connector. 4.CHECK SIGNAL FOR MOTOR Check voltage between mode door motor connector M51 terminal 3 and ground, between air mix door motor connector M34 terminal 3 and ground, and between intake door motor connector M48 terminal 3 and ground. Terminals Door motors (-) Voltage (V) (Approx.) Body ground 5.5V (+) Connectors Mode M51-3 Air mix M34-3 Intake M48-3 WJIA1188E OK or NG OK >> GO TO 5. NG >> Replace harness or connector. 5.CHECK MOTOR GROUND CIRCUIT 1. 2. 3. Turn ignition switch OFF. Disconnect door motor connectors. Check continuity between mode door motor connector M51 terminal 2 and ground, between air mix door motor connector M34 terminal 2 and ground, and between intake door motor connector M48 terminal 2 and ground. Terminals Door motors (+) Connector Mode M51-2 Air mix M34-2 Intake M48-2 Continuity (-) Body ground Yes WJIA0884E OK or NG OK >> GO TO 6. NG >> Replace harness or connector. 6.CHECK MOTOR OPERATION Disconnect and reconnect the motor connectors and confirm the motor operation. OK or NG OK >> (Returns to normal operation.) • Motor connector contacts dirty or damaged NG >> (Does not operate normally.) • GO TO 7. Revision: January 2010 MTC-42 2010 Sentra TROUBLE DIAGNOSIS < SERVICE INFORMATION > 7.CHECK MODE DOOR MOTOR AND AIR MIX DOOR MOTOR OPERATION 1. 2. Disconnect the intake door motor connector. Reconnect the mode door motor connector and air mix door motor connector, confirm the mode door motor and air mix door motor operation. OK or NG OK >> (Mode door motor and air mix door motor operate normally.) • Replace the intake door motor. Refer to MTC-73, "Removal and Installation". NG >> (Mode door motor and air mix door motor do not operate normally.) • GO TO 8. 8.CHECK AIR MIX DOOR MOTOR AND INTAKE DOOR MOTOR OPERATION A B C D 1. 2. Disconnect mode door motor connector. Reconnect the intake door motor connector, confirm the air mix door motor and intake door motor operation. OK or NG OK >> (Air mix door motor and intake door motor operate normally.) • Replace mode door motor. Refer toMTC-74, "Removal and Installation". NG >> (Air mix door motor and intake door motor do not operate normally.) • GO TO 9. 9.CHECK INTAKE DOOR MOTOR AND MODE DOOR MOTOR OPERATION E F G 1. Disconnect air mix door motor connector. 2. Reconnect mode door motor connector, confirm the intake door motor and mode door motor operation. OK or NG OK >> (Intake door motor and mode door motor operate normally.) • Replace air mix door motor. Refer to MTC-75, "Removal and Installation". NG >> (Intake door motor and mode door motor do not operate normally.) • Replace front air control. Refer to MTC-66, "Removal and Installation". H I MTC Mode Door Motor Circuit INFOID:0000000005282784 K SYMPTOM: • Air outlet does not change. • Mode door motor does not operate normally. L INSPECTION FLOW 1.CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - DISCHARGE AIR M 1. 2. Turn mode dial to all five positions. Confirm that discharge air comes out according to the air distribution table. Refer to MTC-25, "Discharge Air Flow". Can a symptom be duplicated? YES >> GO TO 3. NO >> GO TO 2. N O 2.PERFORM COMPLETE OPERATIONAL CHECK Perform a complete operational check and check for any symptoms. Refer to MTC-38, "Operational Check". Can a symptom be duplicated? YES >> Refer to MTC-27, "How to Perform Trouble Diagnosis for Quick and Accurate Repair". NO >> System OK. 3.CHECK FOR SERVICE BULLETINS Check for any service bulletins. Revision: January 2010 MTC-43 2010 Sentra P TROUBLE DIAGNOSIS < SERVICE INFORMATION > >> GO TO 4. 4.CHECK MODE DOOR OPERATION Check and verify mode door mechanism for smooth operation in each mode. OK or NG OK >> GO TO 5. NG >> Repair as necessary. 5.CHECK LAN SYSTEM CIRCUIT Perform diagnostic procedure for the LAN system. Refer to MTC-41, "LAN System Circuit". OK or NG OK >> If the symptom still exists, perform a complete operational check. Refer to MTC-38, "Operational Check". If no other symptom exists replace front air control. Refer to MTC-66, "Removal and Installation". NG >> Repair as necessary. SYSTEM DESCRIPTION Component Parts Mode door control system components are: • Front air control • Mode door motor (LCU) System Operation The front air control receives signals from its various dials and switches. The front air control then sends air mix door, mode door and intake door motor opening angle data to the air mix door motor LCU, mode door motor LCU and intake door motor LCU. The mode door motor reads their respective signals according to the address signal. Opening angle indication signals received from the front air control and each of the motor position sensors are compared by the LCU's in each motor with the existing decision and opening angles. Subsequently, HOT/COLD or DEFROST/VENT or FRESH/RECIRCULATION operation is selected. The new selection data is returned to the front air control. WJIA0920E COMPONENT DESCRIPTION Mode Door Motor Revision: January 2010 MTC-44 2010 Sentra TROUBLE DIAGNOSIS < SERVICE INFORMATION > The mode door motor (1) is attached to the heater and cooling unit assembly. It rotates so that air is discharged from the outlet set by the front air control. Motor rotation is conveyed to a link which activates the mode door. A B C WJIA2282E D DIAGNOSTIC PROCEDURE E SYMPTOM: Mode door motor and/or air mix door motor does not operate normally. Perform diagnostic procedure for LAN system circuit. Refer to MTC-41, "LAN System Circuit". F Air Mix Door Motor Circuit INFOID:0000000005282785 SYMPTOM: H • Discharge air temperature does not change. • Air mix door motor does not operate. INSPECTION FLOW 1.CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE INCREASE 1. 2. G Turn the temperature control dial clockwise. Check for hot air at discharge air outlets. I MTC >> GO TO 2. 2.CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE DECREASE 1. Turn the temperature control dial counterclockwise. 2. Check for cold air at discharge air outlets. Can a symptom be duplicated? YES >> GO TO 4. NO >> GO TO 3. K L M 3.PERFORM COMPLETE OPERATIONAL CHECK Perform a complete operational check and check for any symptoms. Refer to MTC-38, "Operational Check". Can a symptom be duplicated? YES >> Refer to MTC-27, "How to Perform Trouble Diagnosis for Quick and Accurate Repair". NO >> System OK. 4.CHECK FOR SERVICE BULLETINS N O Check for any service bulletins. P >> GO TO 5. 5.CHECK AIR MIX DOOR OPERATION Check and verify air mix door mechanism for smooth operation in each mode. OK or NG OK >> GO TO 6. NG >> Repair as necessary. Revision: January 2010 MTC-45 2010 Sentra TROUBLE DIAGNOSIS < SERVICE INFORMATION > 6.CHECK LAN SYSTEM CIRCUIT Perform diagnostic procedure for the LAN system. Refer to MTC-41, "LAN System Circuit". OK or NG OK >> If the symptom still exists, perform a complete operational check. Refer to MTC-38, "Operational Check". If no other symptom exists replace front air control. Refer to MTC-66, "Removal and Installation". NG >> Repair as necessary. SYSTEM DESCRIPTION Component Parts Air mix door control system components are: • Front air control • Air mix door motor (LCU) System Operation The front air control receives signals from its various dials and switches. The front air control then sends air mix door, mode door and intake door motor opening angle data to the air mix door motor LCU, mode door motor LCU and intake door motor LCU. The air mix door motor, mode door motor and intake door motor read their respective signals according to the address signal. Opening angle indication signals received from the front air control and each of the motor position sensors are compared by the LCUs in each motor with the existing decision and opening angles. Subsequently, HOT/COLD or DEFROST/VENT or FRESH/RECIRCULATION operation is selected. The new selection data is returned to the front air control. WJIA0922E COMPONENT DESCRIPTION Air Mix Door Motor The air mix door motor (1) is attached to the heater and cooling unit assembly. It rotates so that the air mix door is opened or closed to a position set by the front air control. Motor rotation is then conveyed through a shaft and the air mix door position is then fed back to the front air control by PBR built-in air mix door motor. WJIA2283E DIAGNOSTIC PROCEDURE SYMPTOM: Discharge air temperature does not change. Revision: January 2010 MTC-46 2010 Sentra TROUBLE DIAGNOSIS < SERVICE INFORMATION > Perform diagnostic procedure for LAN system circuit. Refer to MTC-41, "LAN System Circuit". A B Intake Door Motor Circuit INFOID:0000000005282786 SYMPTOM: C INSPECTION FLOW D • Intake door does not change. • Intake door motor does not operate normally. 1.CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - REC ( ) 1. Press REC ( ) switch. Recirculation indicator should illuminate. 2. Press REC ( ) switch again. The REC ( ) indicator should go out. 3. Listen for intake door position change (blower sound should change slightly). Can a symptom be duplicated? YES >> GO TO 3. NO >> GO TO 2. E F 2.PERFORM COMPLETE OPERATIONAL CHECK G Perform a complete operational check and check for any symptoms. Refer to MTC-38, "Operational Check". Can a symptom be duplicated? YES >> Refer to MTC-27, "How to Perform Trouble Diagnosis for Quick and Accurate Repair". NO >> System OK. H 3.CHECK FOR SERVICE BULLETINS I Check for any service bulletins. MTC >> GO TO 4. 4.CHECK INTAKE DOOR OPERATION Check and verify intake door mechanism for smooth operation in each mode. OK or NG OK >> GO TO 5. NG >> Repair as necessary. K L 5.CHECK LAN SYSTEM CIRCUIT Perform diagnostic procedure for the LAN system. Refer to MTC-41, "LAN System Circuit". OK or NG OK >> If the symptom still exists, perform a complete operational check. Refer to MTC-38, "Operational Check". If no other symptom exists replace front air control. Refer to MTC-66, "Removal and Installation". NG >> Repair as necessary. SYSTEM DESCRIPTION M N O Component Parts Intake door control system components are: P • Front air control • Intake door motor System Operation Revision: January 2010 MTC-47 2010 Sentra TROUBLE DIAGNOSIS < SERVICE INFORMATION > The intake door control determines intake door position based on the position of the recirculation switch. When the front air control is set to DEFROST, or OFF, the front air control sets the intake door at the fresh position. WJIA0924E COMPONENT DESCRIPTION Intake door motor The intake door motor (1) is attached to the intake unit. It rotates so that air is drawn from inlets set by the front air control. Motor rotation is conveyed to a lever which activates the intake door. Door position is then fed back to the front air control by PBR built-in air mix door motor. WJIA2284E DIAGNOSTIC PROCEDURE SYMPTOM: Intake door motor does not operate normally. Perform diagnostic procedure for LAN system circuit. Refer to MTC-41, "LAN System Circuit". Blower Motor Circuit INFOID:0000000005282787 SYMPTOM: • Blower motor operation is malfunctioning. INSPECTION FLOW 1.CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - FRONT BLOWER 1. Turn blower control dial clockwise one detent. Blower should operate on low speed. 2. Continue checking blower speed until all speeds are checked. 3. Leave blower on HI speed. Can the symptom be duplicated? YES >> GO TO 3. NO >> GO TO 2. 2.PERFORM COMPLETE OPERATIONAL CHECK Revision: January 2010 MTC-48 2010 Sentra TROUBLE DIAGNOSIS < SERVICE INFORMATION > Perform a complete operational check and check for any symptoms. Refer to MTC-38, "Operational Check". Can a symptom be duplicated? YES >> Refer to MTC-27, "How to Perform Trouble Diagnosis for Quick and Accurate Repair". NO >> System OK. 3.CHECK FOR SERVICE BULLETINS A B Check for any service bulletins. C >> GO TO 4. 4.CHECK BLOWER MOTOR CIRCUIT Perform diagnostic procedure for the blower motor circuit. Refer to "DIAGNOSTIC PROCEDURE". OK or NG OK >> If the symptom still exists, perform a complete operational check and check for other symptoms. Refer to MTC-38, "Operational Check". and check for other symptoms. Refer to MTC-27, "How to Perform Trouble Diagnosis for Quick and Accurate Repair". If no other symptom exists replace front air control. Refer to MTC-66, "Removal and Installation". NG >> Repair as necessary. D E F SYSTEM DESCRIPTION Component Parts G Fan speed control system components are: • • • • Front air control LAN system (PBR built-in mode door motor, air mix door motor and intake door motor) Blower motor Fan control amplifier H I System Operation MTC K L M N WJIA0926E COMPONENT DESCRIPTION O Fan Control Amplifier P Revision: January 2010 MTC-49 2010 Sentra TROUBLE DIAGNOSIS < SERVICE INFORMATION > The fan control amplifier (1) is located on the cooling unit. The fan control amp. receives a gate voltage from the front air control to smoothly maintain the blower fan motor voltage in the 5 to the 12V range (approx.). WJIA2285E DIAGNOSTIC PROCEDURE SYMPTOM: Blower motor is malfunctioning. BJIA0013E 1.CHECK POWER SUPPLY FOR FAN CONTROL AMP. 1. 2. 3. Disconnect fan control amp. connector. Turn ignition switch ON. Check voltage between fan control amp. harness connector M52 terminal 3 and ground. Terminal (+) Connector - Terminal M52-3 (-) Voltage (V) (Approx.) Body ground 12V WJIA0855E OK or NG OK >> GO TO 2. NG >> GO TO 7. 2.CHECK FAN FEEDBACK CIRCUIT Revision: January 2010 MTC-50 2010 Sentra TROUBLE DIAGNOSIS < SERVICE INFORMATION > 1. Disconnect front air control connector. 2. Check voltage between front air control harness connector M33 terminal 36 and ground. B (-) Voltage (V) (Approx.) Body ground 12V C Terminal (+) Connector - Terminal M33-18 A OK or NG OK >> GO TO 3. NG >> Check for open circuit in wiring harness. Repair or replace as necessary. BJIA0014E D 3.CHECK BODY GROUND CIRCUIT FOR FAN CONTROL AMP. 1. 2. E Turn ignition switch OFF. Check continuity between fan control amp. harness connector M52 terminal 1 and ground. F Terminal Connector - Terminal M52-1 Continuity Body ground Yes OK or NG OK >> Reconnect fan control amp. harness connector and GO TO 4. NG >> Repair harness or connector. G WJIA0856E 4.CHECK VOLTAGE FOR FAN CONTROL AMP. 1. 2. 3. I Turn ignition switch ON. Turn blower control dial to any position except OFF or AUTO. Check voltage between fan control amp. harness connector M52 terminal 2 and ground. MTC K Terminal (+) Connector - Terminal M52-2 (-) Voltage (V) (Approx.) Body ground 12V OK or NG OK >> 1. Replace fan control amp. Refer to MTC-76, "Removal and Installation". 2. Confirm that blower motor operation is normal. NG >> GO TO 5. L WJIA0847E M 5.CHECK FAN CONTROL AMP. CIRCUIT BETWEEN FAN CONTROL AMP. AND FRONT AIR CONTROL 1. 2. 3. Turn ignition switch OFF. Disconnect front air control and fan control amp. harness connectors. Check continuity between fan control amp. harness connector M52 (A) terminal 2 and front air control harness connector M33 (B) terminal 37. Terminals Connector - Terminal M52-2 M33-37 P Yes BJIA0015E If OK, check harness for short. Revision: January 2010 MTC-51 N O Continuity Connector - Terminal H 2010 Sentra TROUBLE DIAGNOSIS < SERVICE INFORMATION > OK or NG OK >> GO TO 6. NG >> Repair harness or connector. 6.CHECK POWER SUPPLY FOR FRONT AIR CONTROL 1. 2. Turn ignition switch ON. Check voltage between front air control harness connector M33 terminal 1 and ground. Terminal (+) Connector - Terminal M33-1 (-) Voltage (V) (Approx.) Body ground 12V OK or NG OK >> 1. NG Replace front air control. Refer to MTC-66, "Removal and Installation". 2. Confirm that blower motor operation is normal. >> • Check for open circuit in wiring harness. Repair or replace as necessary. • If OK, replace fuse and check wiring harness for short circuit. Repair or replace an necessary. BJIA0016E 7.CHECK POWER SUPPLY FOR BLOWER MOTOR 1. 2. 3. 4. Turn ignition OFF. Disconnect blower motor harness connector. Turn ignition switch ON. Check voltage between blower motor harness connector M62 terminal 1 and ground. Terminal (+) Connector - Terminal M62-1 (-) Voltage (V) (Approx.) Body ground 12V OK or NG OK >> GO TO 8. NG >> Check power supply circuit and 15A fuses [Nos. 10 and 11, located in the fuse block (J/B)]. • Check blower motor relay. Refer to PG-5, "Wiring Diagram - POWER -". Repair or replace as necessary. • If OK, check for open circuit in wiring harness. Repair or replace as necessary. • If OK, replace fuse and check wiring harness for short circuit. Repair or replace as necessary. WJIA0056E 8.CHECK CIRCUIT CONTINUITY BETWEEN BLOWER MOTOR AND FAN CONTROL AMP. 1. 2. 3. Turn ignition switch OFF. Disconnect front air control connector. Check continuity between blower motor harness connector M62 terminal 2 and fan control amp. harness connector M52 terminal 3. Terminals Connector - Terminal Connector - Terminal M62-2 M52-3 Continuity Yes OK or NG Revision: January 2010 WJIA0857E MTC-52 2010 Sentra TROUBLE DIAGNOSIS < SERVICE INFORMATION > OK >> Check blower motor. Refer to MTC-48, "Blower Motor Circuit". 1. If NG, replace blower motor. Refer to MTC-67, "Removal and Installation". 2. Confirm that blower motor operation is normal. NG >> Repair harness or connector. A COMPONENT INSPECTION B Blower Motor Confirm smooth rotation of the blower motor (1). • Ensure that there are no foreign particles inside the intake unit. C D E WJIA2286E Magnet Clutch Circuit (If Equipped) F INFOID:0000000005282788 SYMPTOM: Magnet clutch does not engage. G INSPECTION FLOW 1.CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - MAGNET CLUTCH H 1. Turn ignition switch ON. 2. Turn blower control dial to the desired position. 3. Press the A/C switch. A/C indicator will turn on. 4. Confirm that the compressor clutch engages (sound or visual inspection). Can the symptom be duplicated? YES >> GO TO 3. NO >> GO TO 2. I MTC 2.CHECK FOR ANY SYMPTOMS Perform a complete operational check for any symptoms. Refer to MTC-38, "Operational Check". Does another symptom exist? YES >> Refer to MTC-27, "How to Perform Trouble Diagnosis for Quick and Accurate Repair". NO >> System OK. K L 3.CHECK FOR SERVICE BULLETINS Check for any service bulletins. M >> GO TO 4. 4.CHECK COMPRESSOR BELT TENSION N Check compressor belt tension. Refer to EM-13, "Checking Drive Belts" (MR20DE) or EM-130, "Checking Drive Belts" (QR25DE). OK or NG OK >> GO TO 5. NG >> Adjust or replace A/C compressor belt. O 5.CHECK REFRIGERANT PRESSURE Check refrigerant pressure with manifold gauge connected. Refer to MTC-56, "Insufficient Cooling". OK or NG OK >> GO TO 6. NG >> Perform trouble diagnosis for unusual pressure. Refer to MTC-56, "Insufficient Cooling". 6.CHECK MAGNET CLUTCH CIRCUIT Revision: January 2010 MTC-53 2010 Sentra P TROUBLE DIAGNOSIS < SERVICE INFORMATION > Perform diagnostic procedure for the magnetic clutch. Refer to "DIAGNOSTIC PROCEDURE". OK or NG OK >> If the symptom still exists, perform a complete operational check. Refer to MTC-38, "Operational Check". If other symptoms exist, refer to MTC-27, "How to Perform Trouble Diagnosis for Quick and Accurate Repair". NG >> Repair as necessary. SYSTEM DESCRIPTION Front air control controls compressor operation by a signal from ECM. DIAGNOSTIC PROCEDURE SYMPTOM: Magnet clutch does not engage when A/C switch is ON. WJIA2305E 1.CHECK CIRCUIT CONTINUITY BETWEEN A/C RELAY IN IPDM E/R AND COMPRESSOR 1. 2. Disconnect IPDM E/R connector E43 and compressor connector. Check continuity between A/C compressor harness connector F3 (B) terminal 2 and IPDM E/R harness connector E43 (A) terminal 11. Terminals Continuity Connector - Terminal Connector - Terminal F3 (A) - 2 E43 (B) - 11 Yes If OK, check harness for short to ground. OK or NG OK >> GO TO 2. NG >> Repair harness or connector. WJIA2291E 2.CHECK POWER SUPPLY FOR COMPRESSOR Revision: January 2010 MTC-54 2010 Sentra TROUBLE DIAGNOSIS < SERVICE INFORMATION > 1. Reconnect IPDM E/R harness connectors. 2. Start engine and press A/C switch. 3. Check voltage between A/C compressor harness connector F3 terminal 2 and ground. A B Terminal (+) Connector - Terminal F3-2 (-) Voltage (V) (Approx.) Body ground 12V BJIA0019E OK or NG OK >> NG C Check magnet clutch coil. 1. If NG, replace magnet clutch. Refer to MTC-85, "Removal and Installation for Compressor MR20DE" or MTC-86, "Removal and Installation for Compressor - QR25DE". 2. If OK, check A/C compressor mounting points for looseness or corrosion and repair as necessary. >> GO TO 3. D E 3.CHECK FUSE IN IPDM E/R F Check 10A fuse [No. 42 located at the IPDM E/R]. OK or NG OK >> GO TO 4. NG >> Replace fuse and check IPDM E/R for short circuit. Replace if necessary. G 4.CHECK CONTINUITY BETWEEN BCM AND FRONT AIR CONTROL 1. 2. H Disconnect BCM connector M18 and front air control connector M33. Check continuity between BCM harness connector M18 (A) terminals 27, 28 and front air control connector M33 (B) terminals 40, 39. Terminals I MTC Continuity Connector - Terminal Connector - Terminal M18 (A) - 27 M33 (B) - 40 M18 (A) - 28 M33 (B) - 39 Yes OK or NG OK >> GO TO 5. NG >> Repair harness or connector. K BJIA0020E L 5.CHECK REFRIGERANT PRESSURE SENSOR INPUT SIGNAL M Check voltage between ECM harness connector F25 terminal 41 [*1(with MR20DE)], 39 [(*2 with QR25DE)] and ground. Terminal (+) (-) Voltage (V) (Approx.) Body ground 12V N Connector - Terminal F25 - 41 with MR20DE F25 - 39 with QR25DE OK or NG OK >> GO TO 6. NG >> 1. Repair harness or connector. 2. Confirm that magnet clutch operation is normal. O WJIA2306E 6.CHECK REFRIGERANT PRESSURE SENSOR Refer to EC-570, "Component Description"(MR20DE) or EC-1666, "Component Description" (QR25DE). OK or NG Revision: January 2010 MTC-55 2010 Sentra P TROUBLE DIAGNOSIS < SERVICE INFORMATION > OK >> GO TO 7. NG >> Replace refrigerant pressure sensor. Refer to MTC-88, "Removal and Installation for Refrigerant Pressure Sensor". 7.CHECK COMPRESSOR ON SIGNAL Check voltage between front air control connector M33 terminal 40 and ground, with A/C compressor ON and with A/C compressor OFF. Terminal (+) Connector - Terminal M33 - 40 Voltage (V) (Approx.) (-) Body ground A/C Compressor ON: 0V A/C Compressor OFF: 5V OK or NG BJIA0021E OK >> GO TO 8. NG >> • When A/C compressor is ON and voltage is not approx. 0V, Replace front air control. Refer to MTC-66, "Removal and Installation". • When A/C compressor is OFF and voltage is not approx. 5V, BCM is malfunctioning. 8.CHECK CAN COMMUNICATION CIRCUITS Check CAN communication circuits between BCM to ECM and between ECM to IPDM E/R. Refer to LAN-10, "Symptom When Error Occurs in CAN Communication System". OK or NG OK >> ECM malfunctioning. NG >> Repair or replace component based on the result of diagnosis. Insufficient Cooling INFOID:0000000005282789 SYMPTOM: Insufficient cooling INSPECTION FLOW 1.CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE DECREASE 1. Turn temperature control dial counterclockwise to maximum cold position. 2. Check for cold air at discharge air outlets. Can the symptom be duplicated? YES >> GO TO 3. NO >> GO TO 2. 2.CHECK FOR ANY SYMPTOMS Perform a complete operational check for any symptoms. Refer to MTC-38, "Operational Check". Does another symptom exist? YES >> Refer to MTC-27, "How to Perform Trouble Diagnosis for Quick and Accurate Repair". NO >> System OK. 3.CHECK FOR SERVICE BULLETINS Check for any service bulletins. >> GO TO 4. 4.CHECK COMPRESSOR DRIVE BELT TENSION Check compressor belt tension. Refer to EM-13, "Checking Drive Belts" (MR20DE) or EM-130, "Checking Drive Belts" (QR25DE). OK or NG OK >> GO TO 5. NG >> Adjust or replace compressor belt. Refer to EM-13, "Tension Adjustment" (MR20DE) or EM-13, "Tension Adjustment" (QR25DE). Revision: January 2010 MTC-56 2010 Sentra TROUBLE DIAGNOSIS < SERVICE INFORMATION > 5.CHECK AIR MIX DOOR OPERATION A Check and verify air mix door mechanism for smooth operation in each mode. Does air mix door operate correctly? YES >> GO TO 6. NO >> Repair or replace as necessary. B 6.CHECK COOLING FAN MOTOR OPERATION C Check and verify cooling fan motor for smooth operation. Refer to EC-436, "System Description". Does cooling fan motor operate correctly? YES >> GO TO 7. NO >> Check cooling fan motor. Refer to EC-436. D 7.CHECK RECOVERY/RECYCLING EQUIPMENT BEFORE USAGE Check recovery/recycling equipment before connecting to vehicle. Verify there is no pressure in the recovery/ recycling equipment by checking the gauges. If pressure exists, recover refrigerant from equipment lines. E F >> GO TO 8. 8.CHECK REFRIGERANT PURITY 1. Connect recovery/recycling equipment to vehicle. 2. Confirm refrigerant purity in supply tank using recovery/recycling and refrigerant identifier. OK or NG OK >> GO TO 9. NG >> Check contaminated refrigerant. Refer to MTC-4, "Contaminated Refrigerant". G Check refrigerant pressure with manifold gauge connected. Refer to "TEST READING". OK or NG OK >> Perform diagnostic work flow. Refer to "DIAGNOSTIC WORK FLOW". NG >> GO TO 10. I H 9.CHECK FOR REFRIGERANT PRESSURE MTC 10.CHECK FOR EVAPORATOR FREEZE UP Start engine and run A/C. Check for evaporator freeze up. Does evaporator freeze up? YES >> Perform diagnostic work flow. Refer to "DIAGNOSTIC WORK FLOW". NO >> GO TO 11. K L 11.CHECK AIR DUCTS Check ducts for air leaks. OK or NG OK >> If the symptom still exists, perform a complete operational check. Refer to MTC-38, "Operational Check". If other symptoms exist, refer to MTC-27, "How to Perform Trouble Diagnosis for Quick and Accurate Repair". NG >> Repair air leaks. DIAGNOSTIC WORK FLOW M N O P Revision: January 2010 MTC-57 2010 Sentra TROUBLE DIAGNOSIS < SERVICE INFORMATION > AWIIA0999GB *1 MTC-90, "Checking System for Leaks Using the Fluorescent Leak Detector" *2 MTC-85, "Removal and Installation *3 for Compressor - MR20DE" or MTC86, "Removal and Installation for Compressor - QR25DE" *4 "TROUBLE DIAGNOSIS FOR ABNORMAL PRESSURE" *5 MTC-45, "Air Mix Door Motor Circuit" Revision: January 2010 MTC-58 "PERFORMANCE CHART" 2010 Sentra TROUBLE DIAGNOSIS < SERVICE INFORMATION > A B C D E F G H I MTC K L M N AWIIA1000GB *1 MTC-67, "Removal and Installation" *2 MTC-48, "Blower Motor Circuit" *4 EM-13, "Checking Drive Belts" (MR20DE) or EM-130, "Checking Drive Belts" (QR25DE) *5 MTC-85, "Removal and Installation for Compressor - MR20DE" or MTC86, "Removal and Installation for Compressor - QR25DE" *3 MTC-85, "Removal and Installation for Compressor - MR20DE" or MTC86, "Removal and Installation for Compressor - QR25DE" PERFORMANCE CHART Test Condition Revision: January 2010 MTC-59 2010 Sentra O P TROUBLE DIAGNOSIS < SERVICE INFORMATION > Testing must be performed as follows: Vehicle location Indoors or in the shade (in a well-ventilated place) Doors Closed Door windows Open Hood Open TEMP. Max. COLD Mode switch (Ventilation) set Intake switch (Recirculation) set Max. speed set (fan) speed Engine speed Idle speed Operate the air conditioning system for 10 minutes before taking measurements. TEST READING Recirculating-to-discharge Air Temperature Table Inside air (Recirculating air) at blower assembly inlet Relative humidity % Discharge air temperature at center ventilator °C (°F) Air temperature °C (°F) 50 - 60 60 - 70 25 (77) 10.0 - 12.3 (50 - 54) 30 (86) 13.2 - 15.3 (56 - 60) 35 (95) 17.2 - 21.0 (63 - 70) 25 (77) 12.3 - 14.9 (54 - 59) 30 (86) 15.3 - 19.3 (60 - 67) 35 (95) 21.0 - 24.4 (70 - 76) Ambient Air Temperature-to-operating Pressure Table Ambient air Relative humidity % 50 - 70 High-pressure (Discharge side) kPa (kg/cm2, psi) Air temperature °C (°F) Low-pressure (Suction side) kPa (kg/cm2, psi) 30 (86) 1,220 - 1,500 (12.44 - 15.30, 176.9 - 217.5) 240 - 295 (2.45 - 3.01, 34.8 - 42.8) 35 (95) 1,360 - 1,690 (13.87 - 17.24, 197.2 - 245.1) 275 - 335 (2.81 - 3.42, 39.9 - 48.6) 40 (104) 1,500 - 1,830 (12.44 - 18.67, 176.9 - 265.4) 310 - 375 (3.16 - 3.83, 45.0 - 54.4) TROUBLE DIAGNOSIS FOR ABNORMAL PRESSURE Whenever system's high and/or low side pressure is abnormal, diagnose using a manifold gauge. The marker above the gauge scale in the following tables indicates the standard (normal) pressure range. Since the standard (normal) pressure differs from vehicle to vehicle, refer to Ambient Air Temperature-to-operating Pressure Table above. Both High- and Low-pressure Sides are Too High Revision: January 2010 MTC-60 2010 Sentra TROUBLE DIAGNOSIS < SERVICE INFORMATION > Gauge indication Both high and low-pressure sides are too high. Refrigerant cycle Probable cause Pressure is reduced soon after water is splashed on condenser. Excessive refrigerant charge in refrigeration cycle Reduce refrigerant until specified pressure is obtained. Air suction by cooling fan is insufficient. Insufficient condenser cooling performance ↓ 1. Condenser fins are clogged. 2. Improper fan rotation of cooling fan • Clean condenser. • Check and repair cooling fan as necessary. Poor heat exchange in condenser (After compressor operation stops, high pressure decreases too slowly.) ↓ Air in refrigeration cycle Evacuate and recharge system. Engine tends to overheat. Engine cooling systems malfunction. Check and repair each engine cooling system. • An area of the low-pressure pipe is colder than areas near the evaporator outlet. • Plates are sometimes covered with frost. • Excessive liquid refrigerant on low-pressure side • Excessive refrigerant discharge flow • Expansion valve is open a little compared with the specification. ↓ 1. Improper thermal valve installation 2. Improper expansion valve adjustment • Low-pressure pipe is not cold. • When compressor is stopped high-pressure value quickly drops by approximately 196 kPa (2 kg/cm2, 28 psi). It then decreases gradually thereafter. AC359A Corrective action A B C D E F G H Replace expansion valve. I MTC High-pressure Side is Too High and Low-pressure Side is Too Low Gauge indication Refrigerant cycle Probable cause Corrective action High-pressure side is too high and low-pressure side is too low. K L Upper side of condenser and high-pressure side are hot, however, liquid tank is not so hot. High-pressure tube or parts located between compressor and condenser are clogged or crushed. • Check and repair or replace malfunctioning parts. • Check oil for contamination. M N AC360A High-pressure Side is Too Low and Low-pressure Side is Too High O P Revision: January 2010 MTC-61 2010 Sentra TROUBLE DIAGNOSIS < SERVICE INFORMATION > Gauge indication Refrigerant cycle High-pressure side is too low and low-pressure side is too high. High and low-pressure sides become equal soon after compressor operation stops. Compressor pressure operation is improper. ↓ Damaged inside compressor pickings Replace compressor. No temperature difference between high and low-pressure sides Compressor pressure operation is improper. ↓ Damaged inside compressor pickings. Replace compressor. AC356A Probable cause Corrective action Both High- and Low-pressure Sides are Too Low Gauge indication Both high- and low-pressure sides are too low. Refrigerant cycle Probable cause Corrective action • There is a big temperature difference between liquid tank outlet and inlet. Outlet temperature is extremely low. • Liquid tank inlet and expansion valve are frosted. Liquid tank inside is slightly clogged. • Replace desiccant assembly. • Check oil for contamination. • Temperature of expansion valve inlet is extremely low as compared with areas near liquid tank. • Expansion valve inlet may be frosted. • Temperature difference occurs somewhere in highpressure side High-pressure pipe located between receiver drier and expansion valve is clogged. • Check and repair malfunctioning parts. • Check oil for contamination. Expansion valve and liquid tank are warm or only cool when touched. Low refrigerant charge ↓ Leaking fittings or components Check refrigerant for leaks. Refer to Checking Refrigerant Leaks, MTC-90, "Checking of Refrigerant Leaks" and MTC91, "Electronic Refrigerant Leak Detector". There is a big temperature difference between expansion valve inlet and outlet while the valve itself is frosted. Expansion valve closes a little compared with the specification. ↓ 1. Improper expansion valve adjustment 2. Malfunctioning thermal valve 3. Outlet and inlet may be clogged. • Remove foreign particles by using compressed air. • Check oil for contamination. An area of the low-pressure pipe is colder than areas near the evaporator outlet. Low-pressure pipe is clogged or crushed. • Check and repair malfunctioning parts. • Check oil for contamination. Air flow volume is not enough or is too low. Evaporator is frozen. • Check thermo control amp. and intake sensor operation. • Replace compressor. AC353A Low-pressure Side Sometimes Becomes Negative Revision: January 2010 MTC-62 2010 Sentra TROUBLE DIAGNOSIS < SERVICE INFORMATION > Gauge indication Refrigerant cycle Probable cause Corrective action Low-pressure side sometimes becomes negative. • Air conditioning system does not function and does not cyclically cool the compartment air. • The system constantly functions for a certain period of time after compressor is stopped and restarted. Refrigerant does not discharge cyclically. ↓ Moisture is frozen at expansion valve outlet and inlet. ↓ Water is mixed with refrigerant. • Drain water from refrigerant or replace refrigerant. • Replace desiccant assembly. A B C D AC354A Low-pressure Side Becomes Negative Gauge indication Refrigerant cycle Low-pressure side becomes negative. Liquid tank or front/rear side of expansion valve's pipe is frosted or dewed. Probable cause Corrective action High-pressure side is closed and refrigerant does not flow. ↓ Expansion valve or liquid tank is frosted. Leave the system at rest until no frost is present. Start it again to check whether or not the problem is caused by water or foreign particles. • If water is the cause, initially cooling is okay. Then the water freezes causing a blockage. Drain water from refrigerant or replace refrigerant. • If due to foreign particles, remove expansion valve and remove the particles with dry and compressed air (not shop air). • If either of the above methods cannot correct the problem, replace expansion valve. • Replace desiccant assembly. • Check oil for contamination. AC362A Insufficient Heating INFOID:0000000005282790 E F G H I MTC K L SYMPTOM: Insufficient heating INSPECTION FLOW 1.CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE INCREASE 1. Turn temperature control dial clockwise to maximum heat position. 2. Check for hot air at discharge air outlets. Can the symptom be duplicated? YES >> GO TO 3. NO >> GO TO 2. N O 2.CHECK FOR ANY SYMPTOMS Perform a complete operational check for any symptoms. Refer to MTC-38, "Operational Check". Does another symptom exist? YES >> Refer to MTC-27, "How to Perform Trouble Diagnosis for Quick and Accurate Repair". NO >> System OK. P 3.CHECK FOR SERVICE BULLETINS Check for any service bulletins. Revision: January 2010 MTC-63 M 2010 Sentra TROUBLE DIAGNOSIS < SERVICE INFORMATION > >> GO TO 4. 4.CHECK COOLANT SYSTEM 1. Check engine coolant level. Refer to CO-11, "Inspection" (MR20DE) or CO-39, "Inspection" (QR25DE). 2. Check hoses for leaks or kinks. 3. Check radiator cap. Refer to CO-11, "Inspection" (MR20DE) or CO-39, "Inspection" (QR25DE). OK or NG OK >> GO TO 5. NG >> Repair/replace as necessary. 5.CHECK AIR MIX DOOR OPERATION Check and verify air mix door mechanism for smooth operation in each mode. OK or NG OK >> GO TO 6. NG >> Adjust or replace air mix door. 6.CHECK AIR DUCTS Check ducts for air leaks. OK or NG OK >> GO TO 7. NG >> Repair air leaks. 7.CHECK HEATER HOSE TEMPERATURES 1. Start engine and warm it up to normal operating temperature. 2. Touch both the inlet and outlet heater hoses. Is the inlet hose hot and the outlet hose warm? YES >> GO TO 8. NO >> Both hoses warm: GO TO 9. 8.CHECK THERMOSTAT Check thermostat for smooth operation. OK or NG OK >> System OK. NG >> Repair or replace as necessary. Retest. 9.CHECK HEATER HOSES Check heater hoses for proper installation. OK or NG OK >> GO TO 10. NG >> Repair /replace as necessary. Retest GO TO 7. 10.BACK FLUSH HEATER CORE 1. 2. 3. Back flush heater core. Drain the water from the system. Refill system with new engine coolant. Refer to CO-12, "Changing Engine Coolant" (MR20DE) or CO-40, "Changing Engine Coolant" (QR25DE). 4. Start engine and warm it up to normal operating temperature. 5. Touch both the inlet and outlet heater hoses. Is the inlet hose hot and the outlet hose warm? YES >> System OK. NO >> Replace heater core and refill engine coolant. Refer to MTC-72, "Removal and Installation". Noise INFOID:0000000005282791 SYMPTOM: Noise INSPECTION FLOW Revision: January 2010 MTC-64 2010 Sentra TROUBLE DIAGNOSIS < SERVICE INFORMATION > A B C D E F G H I MTC K L M N AWIIA1001GB *1 MTC-38, "Operational Check" *2 EM-13, "Checking Drive Belts" (MR20DE) or EM-130, "Checking Drive Belts" (QR25DE) *4 MTC-90, "Removal and Installation for Expansion Valve" *5 MTC-85, "Removal and Installation *6 for Compressor - MR20DE" or MTC86, "Removal and Installation for Compressor - QR25DE" MTC-85, "Removal and Installation for Compressor - MR20DE" or MTC86, "Removal and Installation for Compressor - QR25DE" *7 MTC-85, "Removal and Installation *8 for Compressor - MR20DE" or MTC86, "Removal and Installation for Compressor - QR25DE" MTC-18, "Maintenance of Oil Quanti- *9 ty in Compressor" MTC-88, "Removal and Installation for Condenser" Revision: January 2010 MTC-65 *3 MTC-56, "Insufficient Cooling" 2010 Sentra O P CONTROL UNIT < SERVICE INFORMATION > CONTROL UNIT Removal and Installation INFOID:0000000005282792 FRONT AIR CONTROL Removal 1. 2. Remove controller finisher. Refer to IP-12, "Removal and Installation". Remove the five screws (A) and remove the front air control (1). BJIA0024E Installation Installation is in the reverse order of removal. Revision: January 2010 MTC-66 2010 Sentra FRONT BLOWER MOTOR < SERVICE INFORMATION > FRONT BLOWER MOTOR A Removal and Installation INFOID:0000000005282793 REMOVAL B 1. 2. 3. 4. 5. C Remove the instrument panel. Refer to IP-12, "Removal and Installation". Remove the BCM. Refer to BCS-18, "Removal and Installation of BCM". Disconnect the front blower motor connector (2). Remove the one screw (A) from the front blower motor (1). Turn the front blower motor (1) counterclockwise and remove it. • ⇐ : Front D E BJIA0025E F INSTALLATION Installation is in the reverse order of removal. G H I MTC K L M N O P Revision: January 2010 MTC-67 2010 Sentra IN-CABIN MICROFILTER < SERVICE INFORMATION > IN-CABIN MICROFILTER Removal and Installation INFOID:0000000005282794 FUNCTION Air inside passenger compartment is kept clean at either recirculation or fresh mode by installing in-cabin microfilter into heater and cooling unit assembly. LJIA0012E REPLACEMENT TIMING Replace the in-cabin microfilter as recommended. Refer to MA-9, "Schedule 1" and MA-12, "Schedule 2". REPLACEMENT PROCEDURES BJIA0027E 1. Heater and cooling unit assembly Revision: January 2010 2. In-cabin microfilter MTC-68 3. Filter cover 2010 Sentra IN-CABIN MICROFILTER < SERVICE INFORMATION > 1. Remove the filter cover. a. Release the filter cover tab (A) the pull the bottom of the filter cover out tilting it at an angle b. Pull down the filter cover to disengage the hook at the top and remove the filter cover. A B C BJIA0026E 2. 3. 4. a. b. D Remove the in-cabin microfilter. Install the new in-cabin microfilter. CAUTION: • Insert the new filter with the “UP” arrow in the correct orientation. • Insert the new filter with the “UP” arrow side of the filter facing the front of the vehicle. Install the filter cover. Insert the hook at the top of the filter cover into the heater and cooling unit case. Swing the filter cover into the heater and cooling unit case until the filter cover tab (A) snaps securely on the heater and cooling unit case. CAUTION: Check the filter cover to make sure it is securely fastened to the heater and cooling unit case. E F G H I BJIA0026E MTC K L M N O P Revision: January 2010 MTC-69 2010 Sentra HEATER & COOLING UNIT ASSEMBLY < SERVICE INFORMATION > HEATER & COOLING UNIT ASSEMBLY Removal and Installation INFOID:0000000005282795 BJIA0028E A. Steering member bolts B. Heater and cooling unit assembly bolts ⇐ Vehicle front REMOVAL 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. Discharge the refrigerant from the A/C system. Refer to MTC-81, "HFC-134a (R-134a) Service Procedure". Partially drain the engine coolant from the cooling system. Refer to CO-12, "Changing Engine Coolant". Reposition the lower dash insulator out of the way. Disconnect the heater hoses from the heater core pipes. CAUTION: Cap or wrap the joint of the pipe with suitable material such as vinyl tape to avoid entry of contaminants. Disconnect the refrigerant lines from the evaporator. Refer to MTC-83, "Component". CAUTION: Cap or wrap the joint of the pipe with suitable material such as vinyl tape to avoid entry of contaminants. Remove the steering column. Refer to PS-8. Remove the instrument panel assembly. Refer to IP-12, "Removal and Installation". Remove the lower steering member stays. Disconnect the following components. • Shift lock cable • Steering harness clips • SMJ • Fuse box • Door harness • Front pillar harness • CVT shift cable (if equipped) • M/T shift cable (if equipped) • A/C drain hose • Air bag module control unit Disconnect the evaporator drain hose. Remove the steering member bolt caps. Support both front doors with a suitable jack. Remove both front door upper hinge bolts. Refer to BL-130. Revision: January 2010 MTC-70 2010 Sentra HEATER & COOLING UNIT ASSEMBLY < SERVICE INFORMATION > 14. Remove the steering member bolts. 15. Temporarily install the front door upper hinge bolts. 16. Remove the heater and cooling unit and the steering member from the vehicle as one unit. CAUTION: Be careful not to damage the interior and seat trim when removing the heater and cooling unit assembly and steering member from the vehicle. 17. Disconnect the following components to separate the heater and cooling unit assembly from the steering member. • Front blower motor • Fan control amplifier • air mix door motor • Mode door motor • Intake door motor 18. Remove the heater and cooling unit assembly from the steering member. INSTALLATION Installation is in the reverse order of removal. • Fill the radiator with the specified water and coolant mixture. Refer to CO-12, "Changing Engine Coolant". • Recharge the A/C system. Refer to MTC-81, "HFC-134a (R-134a) Service Procedure". • Check and adjust the front door alignment as necessary. Refer to BL-130, "Fitting Adjustment". A B C D E F G H I MTC K L M N O P Revision: January 2010 MTC-71 2010 Sentra HEATER CORE < SERVICE INFORMATION > HEATER CORE Removal and Installation INFOID:0000000005282796 REMOVAL 1. 2. Remove the heater and cooling unit assembly. Refer to MTC-70, "Removal and Installation". Remove the heater core foam seal to access and remove the heater core pipe support screws (A) and then remove the heater core pipe support. BJIA0029E 3. Remove the heater core (1) from the heater and cooling unit assembly (2). BJIA0030E INSTALLATION Installation is in the reverse order of removal. Revision: January 2010 MTC-72 2010 Sentra INTAKE DOOR MOTOR < SERVICE INFORMATION > INTAKE DOOR MOTOR A Removal and Installation INFOID:0000000005282797 REMOVAL 1. 2. 3. B Remove the instrument panel assembly. Refer to IP-12, "Removal and Installation". Disconnect the intake door motor connector (B). Remove the screws (A) and then the intake door motor (1) from the heater and cooling unit assembly. C D E BJIA0031E INSTALLATION F Installation is in the reverse order of removal. G H I MTC K L M N O P Revision: January 2010 MTC-73 2010 Sentra MODE DOOR MOTOR < SERVICE INFORMATION > MODE DOOR MOTOR Removal and Installation INFOID:0000000005282798 REMOVAL 1. 2. 3. Remove the instrument lower cover (LH). Refer to IP-12, "Removal and Installation". Disconnect the mode door motor connector. Remove the two mode door motor screws (A) and then remove the mode door motor (1). BJIA0032E INSTALLATION Installation is in the reverse order of removal. Revision: January 2010 MTC-74 2010 Sentra AIR MIX DOOR MOTOR < SERVICE INFORMATION > AIR MIX DOOR MOTOR A Removal and Installation INFOID:0000000005282799 REMOVAL 1. 2. 3. B Remove the glove box assembly. Refer to IP-12, "Removal and Installation". Disconnect the air mix door motor connector (B). Remove the two air mix door motor screws (A) and then remove the air mix door motor (1). C D E BJIA0033E INSTALLATION F Installation is in the reverse order of removal. G H I MTC K L M N O P Revision: January 2010 MTC-75 2010 Sentra FAN CONTROL AMPLIFIER < SERVICE INFORMATION > FAN CONTROL AMPLIFIER Removal and Installation INFOID:0000000005282800 REMOVAL 1. 2. 3. 4. 5. Remove the instrument lower finisher. Refer to IP-12, "Removal and Installation". Remove the front foot duct (LH). Refer to MTC-77. Remove the accelerator pedal. Refer to ACC-4. Disconnect the fan control amplifier connector (B). Remove the two screws (A) from the fan control amplifier (1) and then remove the fan control amplifier (1). BJIA0034E INSTALLATION Installation is in the reverse order of removal. Revision: January 2010 MTC-76 2010 Sentra DUCTS AND GRILLES < SERVICE INFORMATION > DUCTS AND GRILLES A Removal and Installation INFOID:0000000005282801 Ducts B C D E F G H I MTC K L M N O P BJIA0023E 1. Defroster nozzle 2. Side ventilator duct (LH) 3. Side defroster duct (LH) 4. Front foot duct (LH) 5. Rear floor connector duct (Canada only) 6. Rear floor duct (LH) (Canada only) Revision: January 2010 MTC-77 2010 Sentra DUCTS AND GRILLES < SERVICE INFORMATION > 7. Rear floor duct (RH) (Canada only) 10. Side defroster duct (RH) 8. Front foot duct (RH) 9. Heater and cooling unit assembly 11. Side ventilator duct (RH) Grilles BJIA0035E 1. Upper defroster grille 2. Instrument panel assembly 3. Side defroster grille (LH) 6. Center ventilator grille (RH) 4. Side ventilator grille (LH) 5. Center ventilator grille (LH) 7. Side ventilator grille (RH) 8. Side defroster grille (RH) CENTER VENTILATOR GRILLE RH, LH Removal Release the tabs using a suitable tool and then remove the center ventilator grille. Installation Installation is in the reverse order of removal. UPPER DEFROSTER GRILLE Removal 1. 2. 3. Pry from the rear (farthest from windshield) edge to release the tabs using a suitable tool. Pry from the front (closest to windshield) edge to release the tabs using a suitable tool. Remove the upper defroster grille. Installation Installation is in the reverse order of removal. SIDE VENTILATOR GRILLE RH, LH Removal Release the tabs using a suitable tool and then remove the side ventilator grille. Installation Installation is in the reverse order of removal. Revision: January 2010 MTC-78 2010 Sentra DUCTS AND GRILLES < SERVICE INFORMATION > SIDE DEFROSTER GRILLE RH, LH A Removal Release the tabs using a suitable tool and then remove the side defroster grille. Installation Installation is in the reverse order of removal. B SIDE VENTILATOR DUCT RH, LH C Removal 1. 2. 3. Remove the instrument panel assembly. Refer to IP-12, "Removal and Installation". Remove the defroster nozzle. Remove the side ventilator duct. D Installation Installation is in the reverse order of removal. E DEFROSTER NOZZLE Removal 1. 2. F Remove the instrument panel assembly. Refer to IP-12, "Removal and Installation". Remove the defroster nozzle. G Installation Installation is in the reverse order of removal. SIDE DEFROSTER DUCT RH, LH H Removal 1. 2. 3. Remove the instrument panel assembly. Refer to IP-12, "Removal and Installation". Remove the defroster nozzle. Remove the side defroster duct. I Installation Installation is in the reverse order of removal. MTC FRONT FOOT DUCT RH K Removal 1. 2. Remove the glove box assembly. Refer to IP-12, "Removal and Installation". Remove the front foot duct. L Installation Installation is in the reverse order of removal. M FRONT FOOT DUCT LH Removal 1. 2. Remove the instrument lower finisher. Refer to IP-12, "Removal and Installation". Remove the front foot duct. N Installation Installation is in the reverse order of removal. O REAR FLOOR CONNECTOR DUCT Removal 1. 2. P Push up to disengage the rear floor connector duct from the rear floor duct (LH). Remove the rear floor connector duct. Installation Installation is in the reverse order of removal. REAR FLOOR DUCT RH Revision: January 2010 MTC-79 2010 Sentra DUCTS AND GRILLES < SERVICE INFORMATION > Removal 1. 2. 3. Remove the floor carpet from the front floor area and remove the front floor spacer. Refer to EI-39. Remove the rear floor duct bolt. Remove the rear floor duct. Installation Installation is in the reverse order of removal. REAR FLOOR DUCT LH Removal 1. 2. 3. 4. Remove the floor carpet from the front floor area and remove the front floor spacer. Refer to EI-39. Remove the rear floor connector duct. Remove the rear floor duct bolt. Remove the rear floor duct. Installation Installation is in the reverse order of removal. Revision: January 2010 MTC-80 2010 Sentra REFRIGERANT LINES < SERVICE INFORMATION > REFRIGERANT LINES A HFC-134a (R-134a) Service Procedure INFOID:0000000005282802 SETTING OF SERVICE TOOLS AND EQUIPMENT B Discharging Refrigerant C D E F G WJIA2195E 1. Shut-off valve A. Preferred (best) method 2. A/C service valve 3. H Recovery/recycling equipment I WARNING: Avoid breathing the A/C refrigerant and oil vapor or mist. Exposure may irritate eyes, nose, and throat. Remove the HFC-134a (R-134a) from the A/C system using certified service equipment meeting the MTC requirements of SAE J2210 HFC-134a (R-134a) recycling equipment or J2201 HFC-134a (R-134a) recovery equipment. If an accidental system discharge occurs, ventilate the work area before resuming service. Additional health and safety information may be obtained from the refrigerant and oil man- K ufacturers. Evacuating System and Charging Refrigerant L M N O P WJIA2196E 1. Shut-off valve 2. A/C service valve 3. Recovery/recycling equipment 4. Refrigerant container (HFC-134a) 5. Weight scale (J-39650) 6. Evacuating vacuum pump (J-39699) Revision: January 2010 MTC-81 2010 Sentra REFRIGERANT LINES < SERVICE INFORMATION > 7. Manifold gauge set (J-39183) C. For charging A. Preferred (best) method B. Alternative method Discharging, Evacuating, and Recharging the A/C System WJIA1923E *1 MTC-18, "Maintenance of Oil Quan- *3 tity in Compressor" MTC-90, "Checking of Refrigerant Leaks" *2 MTC-90, "Checking of Refrigerant Leaks" MTC-56, "Insufficient Cooling" Revision: January 2010 *4 MTC-82 *5 MTC-4, "Contaminated Refrigerant" 2010 Sentra REFRIGERANT LINES < SERVICE INFORMATION > Component INFOID:0000000005282803 A MR20DE B C D E F G H I MTC K L M N O P AWIIA1293GB 1. High-pressure pipe 2. Condenser 3. Liquid tank 4. High-pressure flexible hose 5. Compressor 6. Low-pressure flexible hose 7. Heater and cooling unit assembly 8. Drain hose W. Refrigerant leak checking order X. Tightening torque (A-C) Y. Wrench size Z. O-ring size Revision: January 2010 MTC-83 2010 Sentra REFRIGERANT LINES < SERVICE INFORMATION > QR25DE AWIIA1294GB 1. High-pressure pipe 2. Condenser 3. Liquid tank 4. High-pressure flexible hose 5. Compressor 6. Muffler pipe 7. Low-pressure flexible hose 8. Drain hose 9. Heater and cooling unit assembly W. Refrigerant leak checking order X. Tightening torque (A-C) Y. Wrench size Z. O-ring size NOTE: Refer to MTC-5, "Precaution for Refrigerant Connection". Revision: January 2010 MTC-84 2010 Sentra REFRIGERANT LINES < SERVICE INFORMATION > Removal and Installation for Compressor - MR20DE INFOID:0000000005282804 A B C D E F G H I BJIA0036E 1. MTC Compressor REMOVAL 1. 2. 3. 4. 5. 6. 7. K Discharge the refrigerant. Refer to MTC-81, "HFC-134a (R-134a) Service Procedure". Remove the engine undercover. Remove the splash shield RH. Refer to EI-22, "Removal and Installation". Remove the drive belt. Refer to EM-13. Disconnect the compressor connector. Disconnect the high-pressure flexible hose and low-pressure flexible hose. CAUTION: Cap or wrap the joint of the hose with a suitable material such as vinyl tape to avoid the entry of any contaminants. Remove the compressor bolts using power tool, then remove the compressor. INSTALLATION Installation is in the reverse order of removal. CAUTION: • Replace the O-ring of the low-pressure flexible hose and high-pressure flexible hose with new ones, then apply A/C oil to them for installation. • After charging the A/C refrigerant, check for leaks. Refer to MTC-90, "Checking of Refrigerant Leaks". High and low-pressure flexible hose and muffler pipe nuts and bolt : Refer to MTC-83, "Component". Revision: January 2010 MTC-85 2010 Sentra L M N O P REFRIGERANT LINES < SERVICE INFORMATION > Removal and Installation for Compressor - QR25DE INFOID:0000000005282805 WJIA0182E REMOVAL 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. Discharge the refrigerant. Refer to MTC-81, "HFC-134a (R-134a) Service Procedure". Partially drain the engine cooling system. Refer to CO-40, "Changing Engine Coolant". Disconnect the battery negative terminal. Remove the front RH wheel and tire. Remove the engine undercover. Remove the front air duct. Refer to EM-133, "Removal and Installation". Disconnect the upper radiator hose from the radiator. Disconnect the coolant reservoir hose from the radiator. Remove the electric cooling fan assembly. Refer to CO-46, "Removal and Installation". Remove the splash shield RH. Refer to EI-22, "Removal and Installation". Remove the drive belt. Refer to EM-130, "Removal and Installation". Remove the generator assembly. Refer to SC-33, "Removal and Installation QR25DE". Disconnect the compressor connector. Disconnect the high-pressure flexible hose and low-pressure flexible hose. CAUTION: Cap or wrap the joint of the hose with a suitable material such as vinyl tape to avoid the entry of any contaminants. 15. Remove the muffler pipe from the compressor. CAUTION: Cap or wrap the joint of the hose with a suitable material such as vinyl tape to avoid the entry of any contaminants. 16. Remove the compressor bolts using power tool, then remove the compressor. INSTALLATION Installation is in the reverse order of removal. CAUTION: • Replace the O-ring of the low-pressure flexible hose, muffler pipe and high-pressure flexible hose with new ones, then apply A/C oil to them for installation. • After charging the A/C refrigerant, check for leaks. Refer to MTC-90, "Checking of Refrigerant Leaks". High and low-pressure flexible hose and muffler pipe nuts and bolt Revision: January 2010 MTC-86 : Refer to MTC-83, "Component". 2010 Sentra REFRIGERANT LINES < SERVICE INFORMATION > Removal and Installation for Low-Pressure Flexible Hose and Muffler Pipe INFOID:0000000005282806 A NOTE: The QR25DE models are equipped with a two piece low-pressure flexible hose and muffler pipe. The MR20DE models are a one piece low-pressure flexible hose and muffler assembly. B REMOVAL 1. 2. 3. 4. 5. Discharge the refrigerant. Refer to MTC-81, "HFC-134a (R-134a) Service Procedure". Remove the cowl extension panel (QR25DE only). Refer to EI-19, "Removal and Installation". Reposition the lower dash insulator. Remove the low-pressure flexible hose (with muffler on MR20DE only) and muffler pipe as an assembly (QR25DE only). Refer to MTC-83, "Component". CAUTION: Cap or wrap the joint of the hose with a suitable material such as vinyl tape to avoid the entry of contaminants. Separate the low-pressure flexible hose and muffler pipe as necessary (QR25DE only). Refer to MTC-83, "Component". CAUTION: Cap or wrap the joint of the hose with a suitable material such as vinyl tape to avoid the entry of contaminants. INSTALLATION Installation is in the reverse order of removal. CAUTION: • Replace the O-rings on the low-pressure flexible hose and muffler pipe with new ones, then apply A/ C oil to them for installation. • After recharging the refrigerant, check for leaks. Refer to MTC-90, "Checking of Refrigerant Leaks". Removal and Installation for High-pressure Flexible Hose INFOID:0000000005282807 C D E F G H I REMOVAL 1. 2. MTC Discharge the refrigerant. Refer to MTC-81, "HFC-134a (R-134a) Service Procedure". Remove the high-pressure flexible hose. Refer to MTC-83, "Component". CAUTION: Cap or wrap the joint of the hose with a suitable material such as vinyl tape to avoid the entry of K contaminants. INSTALLATION Installation is in the reverse order of removal. CAUTION: • Replace the O-ring of the high-pressure flexible hose with a new one, then apply A/C oil to it for installation. • After charging the refrigerant, check for leaks. Refer to MTC-90, "Checking of Refrigerant Leaks". Removal and Installation for High-pressure Pipe L M INFOID:0000000005282808 N REMOVAL 1. 2. 3. 4. 5. Discharge the refrigerant. Refer to MTC-81, "HFC-134a (R-134a) Service Procedure". Remove the cowl extension panel (QR25DE only). Refer to EI-19, "Removal and Installation". Reposition the lower dash insulator. Disconnect the low-pressure flexible hose bracket to reposition it out of the way. Remove the high-pressure pipe. Refer to MTC-83, "Component". CAUTION: Cap or wrap the joint of the pipe with suitable material such as vinyl tape to avoid the entry of air. INSTALLATION Installation is in the reverse order of removal. CAUTION: Revision: January 2010 MTC-87 2010 Sentra O P REFRIGERANT LINES < SERVICE INFORMATION > • Replace the O-ring of the high-pressure pipe with a new one, then apply compressor oil to it when installing it. • After charging the refrigerant, check for leaks. Refer to MTC-90, "Checking of Refrigerant Leaks". Removal and Installation for Refrigerant Pressure Sensor INFOID:0000000005282809 REMOVAL 1. 2. 3. Remove the front grille. Refer to EI-18. Reposition the LH air guide out of the way. Disconnect the refrigerant pressure sensor connector (1) and remove the refrigerant pressure sensor (2) from the liquid tank (3). CAUTION: Do not damage the condenser fins. BJIA0037E INSTALLATION Installation is in the reverse order of removal. CAUTION: Replace the O-ring of the refrigerant pressure sensor with a new one, then apply compressor oil to it when installing it. Removal and Installation for Condenser INFOID:0000000005282810 REMOVAL 1. 2. 3. 4. 5. 6. Discharge the refrigerant. Refer to MTC-81, "HFC-134a (R-134a) Service Procedure". Remove the radiator. Refer to CO-15, "Component". CAUTION: Be careful not to damage the core surface of the condenser and the radiator. Disconnect the high-pressure flexible hose and the high-pressure pipe from the condenser. CAUTION: Cap or wrap the joint of the pipe and hose with suitable material such as vinyl tape to avoid the entry of contaminants. Disconnect the refrigerant pressure sensor connector (1) and remove the refrigerant pressure sensor (2) from the liquid tank (3). CAUTION: Do not damage the condenser fins. Remove the condenser bracket bolts. Remove the condenser. BJIA0037E INSTALLATION Installation is in the reverse order of removal. CAUTION: • Replace the O-rings of the high-pressure pipe, refrigerant pressure sensor, and high-pressure flexible hose with new ones, then apply A/C oil to them after installing them. • When charging refrigerant, check for leaks. Refer to MTC-90, "Checking of Refrigerant Leaks". Revision: January 2010 MTC-88 2010 Sentra REFRIGERANT LINES < SERVICE INFORMATION > Removal and Installation for Evaporator INFOID:0000000005282811 A B C D E F G H I BJIA0038E 1. Air mix door motor 2. Evaporator cover A. MTC Screws Front K REMOVAL 1. 2. 3. 4. 5. Remove the expansion valve. Refer to MTC-90, "Removal and Installation for Expansion Valve". Remove the instrument lower cover RH. Refer to IP-11, "Component Parts". Remove the glove box. Refer to IP-12, "Removal and Installation". Remove the evaporator cover (1). Remove the evaporator (2). L M N O BJIA0039E INSTALLATION Installation is in the reverse order of removal. CAUTION: • Replace the O-rings with new ones, then apply compressor oil to them when installing them. Revision: January 2010 MTC-89 2010 Sentra P REFRIGERANT LINES < SERVICE INFORMATION > Removal and Installation for Expansion Valve INFOID:0000000005282812 REMOVAL 1. 2. 3. 4. 5. Evacuate and recover the A/C system refrigerant. Refer to MTC-81, "HFC-134a (R-134a) Service Procedure". Reposition the lower dash insulator out of the way. Remove the cowl extension panel (QR25DE only). Refer to EI-19, "Removal and Installation". Disconnect the low-pressure flexible hose and the high-pressure pipe from the expansion valve. CAUTION: Cap or wrap the joint of the pipe and hose with suitable material such as vinyl tape to avoid the entry of contaminants. Remove the expansion valve bolts (A) and then remove the expansion valve (1). SJIA0683E INSTALLATION Installation is in the reverse order of removal. Expansion valve bolts : 3.9 N·m (0.40 kg-m, 35 in-lb) CAUTION: • Replace the O-rings with new ones, then apply compressor oil to them when installing them. Checking of Refrigerant Leaks INFOID:0000000005282813 Perform a visual inspection of all refrigeration parts, fittings, hoses and components for signs of A/C oil leakage, damage and corrosion. A/C oil leakage may indicate an area of refrigerant leakage. Allow extra inspection time in these areas when using either an electronic refrigerant leak detector or fluorescent dye leak detector. If dye is observed, confirm the leak with an electronic refrigerant leak detector. It is possible a prior leak was repaired and not properly cleaned. When searching for leaks, do not stop when one leak is found but continue to check for additional leaks at all system components and connections. When searching for refrigerant leaks using an electronic leak detector, move the probe along the suspected leak area at 25 - 50 mm (1 - 2 in) per second and no further than 6 mm (1/4 in) from the component. CAUTION: Moving the electronic leak detector probe slower and closer to the suspected leak area will improve the chances of finding a leak. Checking System for Leaks Using the Fluorescent Leak Detector 1. 2. 3. 4. INFOID:0000000005282814 Check A/C system for leaks using the UV lamp and safety goggles (J-42220) in a low sunlight area (area without windows preferable). Illuminate all components, fittings and lines. The dye will appear as a bright green/yellow area at the point of leakage. Fluorescent dye observed at the evaporator drain opening indicates an evaporator core assembly (tubes, core or expansion valve) leak. If the suspected area is difficult to see, use an adjustable mirror or wipe the area with a clean shop rag or cloth, with the UV lamp for dye residue. After the leak is repaired, remove any residual dye using refrigerant dye cleaner (J-43872) to prevent future misdiagnosis. Perform a system performance check and verify the leak repair with an approved electronic refrigerant leak detector. Revision: January 2010 MTC-90 2010 Sentra REFRIGERANT LINES < SERVICE INFORMATION > NOTE: Other gases in the work area or substances on the A/C components, for example, anti-freeze, windshield washer fluid, solvents and oils, may falsely trigger the leak detector. Make sure the surfaces to be checked are clean. Clean with a dry cloth or blow off with shop air. Do not allow the sensor tip of the detector to contact with any substance. This can also cause false readings and may damage the detector. Dye Injection INFOID:0000000005282815 NOTE: This procedure is only necessary when recharging the A/C system or when the compressor has seized and has been replaced. 1. 2. 3. 4. 5. 6. 7. Check the A/C system static (at rest) pressure. Pressure must be at least 345 kPa (3.52 kg/cm2, 50 psi). Pour one bottle (1/4 ounce / 7.4 cc) of the A/C refrigerant dye into the injector tool (J-41459). CAUTION: If repairing the A/C system or replacing a component, pour the dye directly into the open system connection and proceed with the service procedures. Connect the injector tool to the A/C LOW PRESSURE side service valve. Start the engine and switch the A/C ON and fan ON. While the A/C is operating (compressor running), inject one bottle (1/4 ounce / 7.4 cc) of fluorescent dye through the low-pressure service valve using dye injector tool (J-41459), refer to the manufacturer's operating instructions. With the engine still running, disconnect the injector tool from the low-pressure service valve. Operate the A/C system for a minimum of 20 minutes to mix the dye with the system oil. Depending on the leak size, operating conditions and location of the leak, it may take from a few minutes to a few days for the dye to penetrate the leak and become visible. A B C D E F G H I Electronic Refrigerant Leak Detector INFOID:0000000005282816 PRECAUTIONS FOR HANDLING THE LEAK DETECTOR MTC When performing a refrigerant leak check, use a electronic refrigerant leak detector (J-41995) or equivalent. Ensure that the instrument is calibrated and set properly per the manufacturer's operating instructions. The leak detector is a delicate device. In order to use the leak detector properly, read the manufacturer's operating instructions and perform any specified maintenance. K L M AHA281A 1. Position the leak detector probe approximately 5 mm (3/16 in) away from the point to be checked. N O P SHA707EA Revision: January 2010 MTC-91 2010 Sentra REFRIGERANT LINES < SERVICE INFORMATION > 2. When testing, circle each fitting completely with the leak detector probe. SHA706E 3. Move the leak detector probe along the component at approximately 25 to 50 mm (1 to 2 in)/sec. SHA708EA CHECKING PROCEDURE NOTE: To prevent inaccurate or false readings, make sure there is no refrigerant vapor, shop chemicals, or cigarette smoke in the vicinity of the vehicle. Perform the leak test in a calm area (low air/wind movement) so that the leaking refrigerant is not dispersed. 1. Turn engine OFF. 2. Connect a suitable A/C manifold gauge set to the A/C service ports. 3. 4. 5. 6. Check if the A/C refrigerant pressure is at least 345 kPa (3.52 kg/cm2, 50 psi) above 16°C (61°F). If less than specification, recover/evacuate and recharge the system with the specified amount of refrigerant. NOTE: At temperatures below 16°C (61°F), leaks may not be detected since the system may not reach 345 kPa (3.52 kg/cm2, 50 psi) pressure. Conduct the leak test from the high side (compressor discharge to evaporator inlet) to the low side (evaporator drain hose to the compressor shaft seal). Refer to MTC-83, "Component". Clean the component to be checked and move the leak detector probe completely around the connection/component. Perform a leak check for the following areas: • Compressor • High and low-pressure hose fittings, relief valve and shaft seal. • Liquid tank • Refrigerant pressure sensor • Service valves - Check that all the service valve caps are secure on the service valves (to prevent leaks). - After removing A/C manifold gauge set from service valves, wipe any residue from the valves to prevent any false readings by the leak detector. • Evaporator - With engine OFF, turn blower fan on “High” for at least 15 seconds to dissipate any refrigerant trace around the evaporator. Wait a minimum of 10 minutes accumulation time (refer to the manufacturer's recommended procedure for actual wait time) before inserting the leak detector probe into the drain hose. - Keep the probe inserted for at least 10 seconds. Use caution not to contaminate the probe tip with water or dirt that may be in the drain hose. If a leak detector detects a leak, verify at least once by blowing compressed air into area of suspected leak, then repeat check as outlined above. Do not stop when one leak is found. Continue to check for additional leaks at all system components. Revision: January 2010 MTC-92 2010 Sentra REFRIGERANT LINES < SERVICE INFORMATION > If no leaks are found, perform steps 7 - 10. 7. Start engine. 8. Set the front air control as follows; a. A/C switch: ON b. Mode: Vent c. Intake position: Recirculation d. Temperature: MAX cold e. Blower fan speed: High 9. Run engine at 1,500 rpm for at least 2 minutes. 10. Turn engine off and perform leak check again following steps 4 through 6 above. Refrigerant leaks should be checked immediately after stopping the engine. Begin with the leak detector at the compressor. The pressure on the high pressure side will gradually drop after refrigerant circulation stops and pressure on the low pressure side will gradually rise, as shown in the graph. Some leaks are more easily detected when pressure is high. A B C D E F SHA839E G 11. Before connecting the recovery/recycling equipment to the A/C system, check the recovery/recycling equipment gauges. No refrigerant pressure should be displayed. If pressure is displayed, recover the H refrigerant from the equipment lines and then check the refrigerant purity. 12. Confirm the refrigerant purity in the supply tank using the recovery/recycling equipment and the refrigerant identifier equipment. I 13. Confirm the refrigerant purity in the A/C system using the recovery/recycling equipment and the refrigerant identifier equipment. 14. Discharge the A/C system using approved refrigerant recovery/recycling equipment. Repair the leaking fitMTC ting or component as necessary. 15. Evacuate and recharge the A/C system and perform the leak test to confirm there are no refrigerant leaks. 16. Conduct the A/C performance test to ensure that the system works properly. Refer to MTC-56, "InsuffiK cient Cooling". L M N O P Revision: January 2010 MTC-93 2010 Sentra SERVICE DATA AND SPECIFICATIONS (SDS) < SERVICE INFORMATION > SERVICE DATA AND SPECIFICATIONS (SDS) Service Data and Specification (SDS) INFOID:0000000005282817 COMPRESSOR Model Valeo Type DCS-171C Displacement 171 cm3 (10.43 in3) / revolution Cylinder bore × stroke 32 mm (1.260 in) x 30.5 mm (1.201 in) Direction of rotation Clockwise (viewed from drive end) Drive belt Poly V 6-grooves OIL Name Capacity Genuine NISSAN A/C System Oil Type S Total in system 150 m Compressor (service part) charging amount Refer to MTC-18, "Maintenance of Oil Quantity in Compressor". (5.03 US fl oz, 5.3 lmp fl oz) REFRIGERANT Type HFC-134a (R-134a) Capacity 0.50 ± 0.05 kg (1.10 ± 0.11 lb) Revision: January 2010 MTC-94 2010 Sentra
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