ATC

User Manual: atc

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ATC-1
AUTOMATIC AIR CONDITIONER
J AIR CONDITIONER
CONTENTS
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AUTOMATIC AIR CONDITIONER
PRECAUTIONS .......................................................... 5
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” .................................................................. 5
Precautions for Working with HFC-134a (R-134a) ..... 5
CONTAMINATED REFRIGERANT ....................... 5
General Refrigerant Precautions .............................. 7
Lubricant Precautions .............................................. 7
Precautions for Refrigerant Connection ................... 8
ABOUT ONE-TOUCH JOINT ................................ 8
FEATURES OF NEW TYPE REFRIGERANT
CONNECTION .................................................... 10
O-RING AND REFRIGERANT CONNECTION ....11
Precautions for Servicing Compressor ................... 13
Precautions for Service Equipment ........................ 13
RECOVERY/RECYCLING EQUIPMENT ............ 13
ELECTRONIC LEAK DETECTOR ...................... 13
VACUUM PUMP ................................................. 14
MANIFOLD GAUGE SET .................................... 14
SERVICE HOSES ............................................... 14
SERVICE COUPLERS ........................................ 15
REFRIGERANT WEIGHT SCALE ...................... 15
CALIBRATING ACR4 WEIGHT SCALE .............. 15
CHARGING CYLINDER ...................................... 15
Precautions for Leak Detection Dye ....................... 16
IDENTIFICATION ................................................ 16
IDENTIFICATION LABEL FOR VEHICLE ........... 16
Wiring Diagrams and Trouble Diagnosis ................ 16
PREPARATION ......................................................... 17
Special Service Tools ............................................. 17
HFC-134a (R-134a) Service Tools and Equipment ... 18
Commercial Service Tools ...................................... 20
REFRIGERATION SYSTEM ..................................... 21
Refrigerant Cycle ................................................... 21
REFRIGERANT FLOW ....................................... 21
FREEZE PROTECTION ..................................... 21
Refrigerant System Protection ............................... 21
REFRIGERANT PRESSURE SENSOR ............. 21
PRESSURE RELIEF VALVE ............................... 21
V-6 Variable Displacement Compressor ................. 22
GENERAL INFORMATION ................................. 22
DESCRIPTION .................................................... 23
Component Layout ................................................. 26
LUBRICANT .............................................................. 27
Maintenance of Lubricant Quantity in Compressor ... 27
LUBRICANT ........................................................ 27
LUBRICANT RETURN OPERATION .................. 27
LUBRICANT ADJUSTING PROCEDURE FOR
COMPONENTS REPLACEMENT EXCEPT
COMPRESSOR .................................................. 28
LUBRICANT ADJUSTING PROCEDURE FOR
COMPRESSOR REPLACEMENT ....................... 29
AIR CONDITIONER CONTROL ............................... 30
Description of Air Conditioner LAN Control System ... 30
System Construction .............................................. 30
OPERATION ........................................................ 30
TRANSMISSION DATA AND TRANSMISSION
ORDER ............................................................... 31
AIR MIX DOOR CONTROL (AUTOMATIC TEM-
PERATURE CONTROL) ..................................... 32
FAN SPEED CONTROL ...................................... 32
INTAKE DOOR CONTROL ................................. 32
OUTLET DOOR CONTROL ................................ 32
MAGNET CLUTCH CONTROL ........................... 32
SELF-DIAGNOSTIC SYSTEM ............................ 32
Description of Control System ................................ 33
Control Operation ................................................... 33
DISPLAY SCREEN .............................................. 34
AUTO SWITCH ................................................... 34
TEMPERATURE SWITCH (POTENTIO TEM-
PERATURE CONTROL) (DRIVER SIDE) ........... 34
TEMPERATURE SWITCH (POTENTIO TEM-
PERATURE CONTROL) (PASSENGER SIDE) ... 34
RECIRCULATION (REC) SWITCH ..................... 34
FRESH (FRE) SWITCH ...................................... 34
DEFROSTER (DEF) SWITCH ............................. 34
REAR WINDOW DEFOGGER SWITCH ............. 34
OFF SWITCH ...................................................... 34
A/C SWITCH ....................................................... 34
MODE SWITCH .................................................. 34
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FAN SWITCH ...................................................... 34
DUAL SWITCH (WITH LEFT AND RIGHT VEN-
TILATION TEMPERATURE SEPARATELY
CONTROL SYSTEM) .......................................... 34
Fail-safe Function ................................................... 35
Discharge Air Flow ................................................. 36
System Description ................................................. 37
SWITCHES AND THEIR CONTROL FUNCTION ... 37
CAN Communication System Description .............. 38
CAN Communication Unit ....................................... 38
TYPE 1/TYPE2 .................................................... 39
TYPE 3 ................................................................ 42
TYPE 4/TYPE5 .................................................... 45
TYPE 6 ................................................................ 48
TROUBLE DIAGNOSIS ............................................ 52
CONSULT-II ............................................................ 52
CONSULT-II BASIC OPERATION ....................... 52
DATA MONITOR .................................................. 53
How to Perform Trouble Diagnosis for Quick and
Accurate Repair ...................................................... 54
WORK FLOW ...................................................... 54
SYMPTOM TABLE .............................................. 54
Component Parts and Harness Connector Location ... 56
ENGINE COMPARTMENT .................................. 56
PASSENGER COMPARTMENT .......................... 57
Schematic ............................................................... 58
Wiring Diagram —A/C— ......................................... 59
Auto Amp. Terminals and Reference Value ............ 64
PIN CONNECTOR TERMINAL LAYOUT ............ 64
TERMINALS AND REFERENCE VALUE FOR
UNIFIED METER AND A/C AMP. ........................ 64
Self-diagnosis Function .......................................... 66
DESCRIPTION .................................................... 66
FUNCTION CONFIRMATION PROCEDURE ...... 67
AUXILIARY MECHANISM: TEMPERATURE
SETTING TRIMMER ........................................... 73
AUXILIARY MECHANISM: FOOT POSITION
SETTING TRIMMER ........................................... 74
AUXILIARY MECHANISM: INLET PORT MEM-
ORY FUNCTION ................................................. 74
Operational Check .................................................. 75
CHECKING MEMORY FUNCTION ..................... 75
CHECKING BLOWER ......................................... 75
CHECKING DISCHARGE AIR ............................ 75
CHECKING RECIRCULATION ............................ 76
CHECKING TEMPERATURE DECREASE ......... 76
CHECKING TEMPERATURE INCREASE .......... 76
CHECK A/C SWITCH .......................................... 76
CHECKING AUTO MODE ................................... 77
Power Supply and Ground Circuit for Auto Amp. ... 77
INSPECTION FLOW ........................................... 77
COMPONENT DESCRIPTION ............................ 78
DIAGNOSTIC PROCEDURE FOR A/C SYSTEM ... 78
LAN System Circuit ................................................ 80
DIAGNOSTIC PROCEDURE FOR LAN CIR-
CUIT .................................................................... 80
Mode Door Motor Circuit ........................................ 83
INSPECTION FLOW ........................................... 83
SYSTEM DESCRIPTION .................................... 84
COMPONENT DESCRIPTION ............................85
DIAGNOSTIC PROCEDURE FOR MODE
DOOR MOTOR ....................................................85
Air Mix Door Motor Circuit .......................................86
INSPECTION FLOW ............................................86
SYSTEM DESCRIPTION .....................................87
COMPONENT DESCRIPTION ............................88
DIAGNOSTIC PROCEDURE FOR AIR MIX
DOOR ..................................................................88
Air Mix Door Motor PBR Circuit ..............................88
DIAGNOSTIC PROCEDURE FOR AIR MIX
DOOR PBR ..........................................................88
Intake Door Motor Circuit ........................................89
INSPECTION FLOW ............................................89
SYSTEM DESCRIPTION .....................................90
COMPONENT DESCRIPTION ............................91
DIAGNOSTIC PROCEDURE FOR INTAKE
DOOR MOTOR ....................................................91
Blower Motor Circuit ................................................92
INSPECTION FLOW ............................................92
SYSTEM DESCRIPTION .....................................93
COMPONENT DESCRIPTION ............................94
DIAGNOSTIC PROCEDURE FOR BLOWER
MOTOR ................................................................94
COMPONENT INSPECTION ...............................97
Magnet Clutch Circuit ..............................................98
INSPECTION FLOW ............................................98
SYSTEM DESCRIPTION .....................................99
DIAGNOSTIC PROCEDURE FOR MAGNET
CLUTCH ..............................................................99
COMPONENT INSPECTION .............................103
Insufficient Cooling ................................................104
INSPECTION FLOW ..........................................104
PERFORMANCE TEST DIAGNOSES ..............105
PERFORMANCE CHART ..................................107
TROUBLE DIAGNOSIS FOR UNUSUAL PRES-
SURE .................................................................108
DIAGNOSTIC PROCEDURE FOR INSUFFI-
CIENT COOLING ...............................................110
Insufficient Heating ...............................................112
INSPECTION FLOW ..........................................112
Noise .....................................................................113
INSPECTION FLOW ..........................................113
Self-diagnosis .......................................................114
INSPECTION FLOW ..........................................114
Memory Function ..................................................115
INSPECTION FLOW ..........................................115
Ambient Sensor Circuit .........................................116
COMPONENT DESCRIPTION ..........................116
AMBIENT TEMPERATURE INPUT PROCESS .116
DIAGNOSTIC PROCEDURE FOR AMBIENT
SENSOR ............................................................116
COMPONENT INSPECTION .............................118
In-vehicle Sensor Circuit .......................................119
COMPONENT DESCRIPTION ..........................119
DIAGNOSTIC PROCEDURE FOR IN-VEHICLE
SENSOR ............................................................120
COMPONENT INSPECTION .............................121
Sunload Sensor Circuit .........................................122
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COMPONENT DESCRIPTION ......................... 122
SUNLOAD INPUT PROCESS .......................... 122
DIAGNOSTIC PROCEDURE FOR SUNLOAD
SENSOR ........................................................... 122
COMPONENT INSPECTION ............................ 124
Intake Sensor Circuit ............................................ 125
COMPONENT DESCRIPTION ......................... 125
DIAGNOSTIC PROCEDURE FOR INTAKE SEN-
SOR .................................................................. 125
COMPONENT INSPECTION ............................ 126
CONTROLLER ....................................................... 127
Removal and Installation of A/C and AV Switch ... 127
REMOVAL ......................................................... 127
INSTALLATION ................................................. 127
AUTO AMP ............................................................. 128
Removal and Installation of Unified Meter and A/C
Amp. ..................................................................... 128
REMOVAL ......................................................... 128
INSTALLATION ................................................. 128
AMBIENT SENSOR ................................................ 129
Removal and Installation ...................................... 129
REMOVAL ......................................................... 129
INSTALLATION ................................................. 129
IN-VEHICLE SENSOR ............................................ 130
Removal and Installation ...................................... 130
REMOVAL ......................................................... 130
INSTALLATION ................................................. 130
SUNLOAD SENSOR .............................................. 131
Removal and Installation ...................................... 131
REMOVAL ......................................................... 131
INSTALLATION ................................................. 131
INTAKE SENSOR ................................................... 132
Removal and Installation ...................................... 132
REMOVAL ......................................................... 132
INSTALLATION ................................................. 133
BLOWER UNIT ....................................................... 134
Removal and Installation ...................................... 134
REMOVAL ......................................................... 134
INSTALLATION ................................................. 134
Disassembly and Assembly ................................. 135
BLOWER MOTOR .................................................. 136
Removal and Installation ...................................... 136
REMOVAL ......................................................... 136
INSTALLATION ................................................. 136
INTAKE DOOR MOTOR ......................................... 137
Removal and Installation ...................................... 137
REMOVAL ......................................................... 137
INSTALLATION ................................................. 137
HEATER & COOLING UNIT ASSEMBLY .............. 138
Removal and Installation ...................................... 138
REMOVAL ......................................................... 138
INSTALLATION ................................................. 139
Disassembly and Assembly ................................. 140
MODE DOOR MOTOR ........................................... 142
Removal and Installation ...................................... 142
REMOVAL ......................................................... 142
INSTALLATION ................................................. 142
AIR MIX DOOR MOTOR .........................................143
Removal and Installation ......................................143
REMOVAL .........................................................143
INSTALLATION .................................................143
HEATER CORE .......................................................144
Removal and Installation ......................................144
REMOVAL .........................................................144
INSTALLATION .................................................144
DUCTS AND GRILLES ...........................................145
Removal and Installation ......................................145
REMOVAL .........................................................145
INSTALLATION .................................................148
REFRIGERANT LINES ...........................................149
HFC-134a (R-134a) Service Procedure ...............149
SETTING OF SERVICE TOOLS AND EQUIP-
MENT ................................................................149
Components .........................................................151
VK45DE .............................................................151
VQ35DE ............................................................152
Removal and Installation of Compressor ..............152
REMOVAL .........................................................152
INSTALLATION .................................................154
Removal and Installation of Compressor Clutch ..155
REMOVAL .........................................................155
INSTALLATION .................................................157
Removal and Installation of Low-pressure Flexible
Hose .....................................................................159
REMOVAL .........................................................159
INSTALLATION .................................................160
Removal and Installation of High-pressure Flexible
Hose .....................................................................160
REMOVAL .........................................................160
INSTALLATION .................................................161
Removal and Installation of Low-pressure Pipe 1
(Engine Compartment) .........................................161
REMOVAL .........................................................161
INSTALLATION .................................................162
Removal and Installation of High-pressure Pipe 1
and 2 (Engine Compartment) ...............................162
REMOVAL .........................................................162
INSTALLATION .................................................163
Removal and Installation of Low-pressure Pipe 2
and High-pressure Pipe 3 .....................................163
REMOVAL .........................................................163
INSTALLATION .................................................164
Removal and Installation of Liquid Tank ...............165
REMOVAL .........................................................165
INSTALLATION .................................................165
Removal and Installation of Condenser ................166
REMOVAL .........................................................166
INSTALLATION .................................................166
Removal and Installation of Refrigerant Pressure
Sensor ..................................................................167
REMOVAL .........................................................167
INSTALLATION .................................................167
Removal and Installation of Evaporator ................167
REMOVAL .........................................................167
INSTALLATION .................................................167
Removal and Installation of Expansion Valve .......169
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REMOVAL .........................................................169
INSTALLATION ..................................................169
Checking for Refrigerant Leaks ............................170
Checking System for Leaks Using the Fluorescent
Leak Detector .......................................................170
Dye Injection .........................................................170
Electronic Refrigerant Leak Detector ....................171
PRECAUTIONS FOR HANDLING LEAK
DETECTOR .......................................................171
CHECKING PROCEDURE ................................172
SERVICE DATA AND SPECIFICATIONS (SDS) ....174
Compressor ..........................................................174
Lubricant ...............................................................174
Refrigerant ............................................................174
Engine Idling Speed ..............................................174
Belt Tension ..........................................................174
PRECAUTIONS
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PRECAUTIONS PFP:00001
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER” AJS001BM
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 Man-
ual.
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 per-
formed by an authorized NISSAN/INFINITI dealer.
●Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal 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.
Precautions for Working with HFC-134a (R-134a) AJS0013V
WARNING:
●CFC-12 (R-12) refrigerant and HFC-134a (R-134a) refrigerant are not compatible. If the refrigerants
are mixed and compressor malfunction is likely to occur, refer to “CONTAMINATED REFRIGER-
ANT” below. To determine the purity of HFC-134a (R-134a) in the vehicle and recovery tank, use
Refrigerant Recovery/Recycling Recharging equipment (ACR4) (J-39500-INF) and Refrigerant
Identifier.
●Use only specified lubricant for the HFC-134a (R-134a) A/C system and HFC-134a (R-134a) compo-
nents. If lubricant other than that specified is used, compressor malfunction is likely to occur.
●The specified HFC-134a (R-134a) lubricant rapidly absorbs moisture from the atmosphere. The fol-
lowing 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 possi-
ble to minimize the entry of moisture into system.
–Only use the specified lubricant from a sealed container. Immediately reseal containers of lubri-
cant. Without proper sealing, lubricant will become moisture saturated and should not be used.
–Avoid breathing A/C refrigerant and lubricant vapor or mist. Exposure may irritate eyes, nose and
throat. Remove HFC-134a (R-134a) from the A/C system, using certified service equipment meet-
ing requirements of SAE J2210 [HFC-134a (R-134a) recycling equipment], or J2209 [HFC-134a (R-
134a) recovery equipment]. If accidental system discharge occurs, ventilate work area before
resuming service. Additional health and safety information may be obtained from refrigerant and
lubricant manufacturers.
–Do not allow lubricant (Nissan A/C System Oil Type S) to come in contact with styrofoam parts.
Damage may result.
CONTAMINATED REFRIGERANT
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 refriger-
ant supply.
●Suggest the customer return the vehicle to the location of previous service where the contamination may
have occurred.
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●If you choose to perform the repair, recover the refrigerant using only dedicated equipment and contain-
ers. 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 avail-
able 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 Cus-
tomer Affairs for further assistance.
PRECAUTIONS
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General Refrigerant Precautions AJS0013W
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.
●Do not pressure test or leak test HFC-134a (R-134a) service equipment and/or vehicle air condi-
tioning 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 refriger-
ant manufacturers.
Lubricant Precautions AJS0013X
●Use only specified lubricant for the HFC-134a (R-134a) A/C system and HFC-134a (R-134a) components.
If lubricant other than that specified is used, compressor malfunction is likely to occur.
●The specified HFC-134a (R-134a) lubricant 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 con-
necting the components. Connect all refrigerant loop components as quickly as possible to minimize the
entry of moisture into system.
–Only use the specified lubricant from a sealed container. Immediately reseal containers of lubricant. With-
out proper sealing, lubricant will become moisture saturated and should not be used.
●Avoid breathing A/C refrigerant and lubricant 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 require-
ments of SAE J2210 [HFC-134a (R-134a) recycling equipment], or J2209 [HFC-134a (R-134a) recovery
equipment]. If accidental system discharge occurs, ventilate work area before resuming service. Addi-
tional health and safety information may be obtained from refrigerant and lubricant manufacturers.
●Do not allow lubricant (Nissan A/C System Oil Type S) to come in contact with styrofoam parts. Damage
may result.
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Precautions for Refrigerant Connection AJS0013Y
A new type refrigerant connection has been introduced to all refrigerant lines except the following location.
●Expansion valve to evaporator
●Refrigerant pressure sensor to condenser
ABOUT ONE-TOUCH JOINT
Description
●One-touch joints are pipe joints which do not require tools during piping connection.
●Unlike conventional connection methods using union nuts and flanges, controlling tightening torque at
connection point is not necessary.
●When removing a pipe joint, use a disconnector.
COMPONENT PARTS
FUNCTIONS OF COMPONENT PARTS
NOTE:
●Garter spring cannot be removed from cage of male-side piping.
●Indicator ring remains near piping connection point, however, this is not a malfunction. (This is to check
piping connection during factory assembly.)
Pipe (Male side) ●Retains O-rings.
●Retains garter spring in cage.
Garter spring Anchors female side piping.
Indicator ring When connection is made properly, this is ejected from male-side piping. (This part is no longer neces-
sary after connection.)
O-ring Seals connection point. (Not reusable)
Pipe (Female side) ●Seals connection by compressing O-rings.
●Anchors piping connection using flare and garter spring.
RJIA0970E
PRECAUTIONS
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REMOVAL
1. Clean piping connection point, and set a disconnector.
2. Slide disconnector in axial direction of piping, and stretch garter spring with tapered point of disconnector.
3. Slide disconnector farther so that inside diameter of garter spring becomes larger than outside diameter of
female-side piping flare. Then male-side piping can be disconnected.
INSTALLATION
1. Clean piping connection points, and insert male-side piping into female-side piping.
2. Push inserted male-side piping harder so that female-side piping flare stretches garter spring.
3. If inside diameter of garter spring becomes larger than outside diameter of female-side piping flare, garter
spring seats on flare. Then, it fits in between male-side piping cage and female-side piping flare to anchor
piping connection point.
NOTICE:
When garter spring seats on flare, and fits in between male-side piping cage and female-side piping flare,
it clicks.
CAUTION:
●Female-side piping connection point is thin. So, when inserting male-side piping, take care not
to deform female-side piping. Slowly insert it in axial direction.
●Insert piping securely until a click is heard.
SJIA0106E
SJIA0107E
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●After piping connection is completed, pull male-side piping by hand to make sure connection
does not come loose.
NOTE:
One-touch joint connection is used in points below.
●Low-pressure pipe 1 to low-pressure pipe 2 (O-ring size: 16)
●High-pressure pipe 1 to high-pressure pipe 2 (O-ring size: 8)
●High-pressure pipe 2 to high-pressure pipe 3 (O-ring size: 8)
●Low-pressure flexible hose to low-pressure pipe 1 (O-ring size: 16)
●Condenser to high-pressure flexible hose (O-ring size: 12)
●Condenser to high-pressure pipe 1 (O-ring size: 8)
FEATURES OF NEW TYPE REFRIGERANT CONNECTION
●The O-ring has been relocated. It has also been provided with a groove for proper installation. This elimi-
nates 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 facil-
itating piping connections.
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PRECAUTIONS
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O-RING AND REFRIGERANT CONNECTION
VK45DE
VQ35DE
RJIA1954E
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CAUTION:
The new and former refrigerant connections use different O-ring configurations. Do not confuse O-
rings 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
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.
Malfunction to do so will cause lubricant 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 opera-
tion. 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 lubricant to circle of the O-rings shown in illustration. Be careful not
to apply lubricant to threaded portion.
Lubricant name: Nissan A/C System Oil Type S
Part number: KLH00-PAGS0
●O-ring must be closely attached to dented 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.
Connection type Piping connection point Part number QTY O-ring size
New
Low-pressure pipe 1 to low-pressure pipe 2 (One-touch joint) 92473 N8221 2 16
Low-pressure pipe 2 to expansion valve 92473 N8210 1 16
High-pressure pipe 1 to high-pressure pipe 2 (One-touch joint) 92471 N8221 2 8
High-pressure pipe 3 to expansion valve 92471 N8210 1 8
High-pressure pipe 2 to high-pressure pipe 3 (One-touch joint) 92471 N8221 2 8
Condenser to high-pressure flexible hose (One-touch joint) 92472 N8221 2 12
Condenser to high-pressure pipe 1 (One-touch joint) 92471 N8221 2 8
Low-pressure flexible hose to low-pressure pipe 1 (One-touch
joint) 92473 N8221 2 16
Compressor to low-pressure flexible hose 92474 N8210 1 19
Compressor to high-pressure flexible hose 92472 N8210 1 12
Liquid tank to condenser pipe Inlet 92471 N8210 18
Outlet 1
Former
Refrigerant pressure sensor to condenser J2476 89956 1 10
Expansion valve to evaporator Inlet 92475 71L00 1 12
Outlet 92475 72L00 1 16
PRECAUTIONS
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●After connecting line, perform 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 con-
nections of seal seat to the specified torque.
Precautions for Servicing Compressor AJS0013Z
●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.
●When replacing or repairing compressor, follow “Maintenance of Lubricant Quantity in Compres-
sor” exactly. Refer to ATC-27, "Maintenance of Lubricant Quantity in Compressor" .
●Keep friction surfaces between clutch and pulley clean. If the surface is contaminated, with lubri-
cant, wipe it off by using a clean waste cloth moistened with thinner.
●After compressor service operation, turn the compressor shaft by hand more than five turns in
both directions. This will equally distribute lubricant inside the compressor. After the compressor
is installed, let the engine idle and operate the compressor for one hour.
●After replacing the compressor magnet clutch, apply voltage to the new one and check for usual
operation.
Precautions for Service Equipment AJS00140
RECOVERY/RECYCLING EQUIPMENT
Be certain to follow the manufacturers instructions for machine operation and machine maintenance. Never
introduce any refrigerant other than that specified into the machine.
ELECTRONIC LEAK DETECTOR
Be certain to follow the manufacturer′s instructions for tester operation and tester maintenance.
RHA861F
ATC-14
PRECAUTIONS
Revision; 2004 April 2003 FX
VACUUM PUMP
The lubricant contained inside the vacuum pump is not compatible
with the specified lubricant for HFC-134a (R-134a) A/C systems.
The vent side of the vacuum pump is exposed to atmospheric pres-
sure. So the vacuum pump lubricant 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 placed 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 man-
ual 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.
MANIFOLD GAUGE SET
Be certain that the gauge face indicates HFC-134a (R-134a or
134a). Be sure the gauge set has 1/2″-16 ACME threaded connec-
tions for service hoses. Confirm the set has been used only with
refrigerant HFC-134a (R-134a) and specified lubricants.
SERVICE HOSES
Be certain that the service hoses display the markings described
(colored hose with black stripe). All hoses must include positive shut
-off devices (either manual or automatic) near the end of the hoses
opposite the manifold gauge.
RHA270DA
SHA533D
RHA272D
PRECAUTIONS
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SERVICE COUPLERS
Never attempt to connect HFC-134a (R-134a) service couplers to an
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.
REFRIGERANT WEIGHT SCALE
Verify that no refrigerant other than HFC-134a (R-134a) and speci-
fied lubricants have been used with the scale. If the scale controls
refrigerant flow electronically, the hose fitting must be 1/2″ -16
ACME.
CALIBRATING ACR4 WEIGHT SCALE
Calibrate the scale every three months.
To calibrate the weight scale on the ACR4 (J-39500-INF):
1. Press Shift/Reset and Enter at the same time.
2. Press 8787 . “A1 ” will be displayed.
3. Remove all weight from the scale.
4. Press 0 , then press Enter . “0.00 ” will be displayed and change to “A2 ”.
5. Place a known weight (dumbbell or similar weight), between 4.5 and 8.6 kg (10 and 19 lb.) on the center
of the weight scale.
6. Enter the known weight using four digits. (Example 10 lb. = 10.00, 10.5 lb. = 10.50)
7. Press Enter — the display returns to the vacuum mode.
8. Press Shift/Reset and Enter at the same time.
9. Press 6 — the known weight on the scale is displayed.
10. Remove the known weight from the scale. “0.00 ” will be displayed.
11. Press Shift/Reset to return the ACR4 to the program mode.
CHARGING CYLINDER
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.
Shut-off valve rotation A/C service valve
Clockwise Open
Counterclockwise Close
RHA273D
RHA274D
ATC-16
PRECAUTIONS
Revision; 2004 April 2003 FX
Precautions for Leak Detection Dye AJS00141
●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.
●The fluorescent dye leak detector is not a replacement for an electronic refrigerant leak detector. The fluo-
rescent dye leak detector should be used in conjunction with an electronic refrigerant leak detector to (J-
41995) pin-point refrigerant leaks.
●For your safety and your customer′s satisfaction, read and follow all manufacture′s operating instructions
and precautions prior to performing the work.
●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 remaining 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
HFC-134a (R-134a) leak detection dye in CFC-12 (R-12) A/C system or CFC-12 (R-12) leak detector 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 malfunction
occurs.
IDENTIFICATION
NOTE:
Vehicles with factory installed fluorescent dye have a green label.
Vehicles without factory installed fluorescent dye have a blue label.
IDENTIFICATION LABEL FOR VEHICLE
Vehicles with factory installed fluorescent dye have this identification
label on the front side of hood.
Wiring Diagrams and Trouble Diagnosis AJS00142
When you read wiring diagrams, refer to the following:
●GI-15, "How to Read Wiring Diagrams" in GI section.
●PG-4, "Wiring Diagram - POWER -" in PG section.
When you perform trouble diagnosis, refer to the following:
●GI-11, "How to Follow Trouble Diagnoses" in GI section.
●GI-27, "How to Perform Efficient Diagnosis for an Electrical Incident" in GI section.
SHA436FA
PREPARATION
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PREPARATION PFP:00002
Special Service Tools AJS00143
The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
Tool number
(Kent-Moore No.)
Tool name
Description
KV99106100
(J-41260)
Clutch disc wrench
Removing shaft nut and clutch disc
KV99232340
(J-38874)
or
KV992T0001
( - )
Clutch disc puller
Removing clutch disc
KV99106200
(J-41261)
Pulley installer
Installing pulley
92530 89908 (for high-pressure
pipe 1)
( - )
92530 89912 (for high-pressure
flexible hose)
( - )
92530 89916 (for low-pressure
pipe 1 and low-pressure flexible
hose)
( - )
Disconnector tool set
(J-45815)
Disconnect one-touch joint connection
S-NT232
RJIA0194E
S-NT376
S-NT235
SJIA0285E
ATC-18
PREPARATION
Revision; 2004 April 2003 FX
HFC-134a (R-134a) Service Tools and Equipment AJS00144
Never mix HFC-134a (R-134a) refrigerant and/or its specified lubricant with CFC-12 (R-12) refrigerant and/or
its lubricant.
Separate and non-interchangeable service equipment must be used for handling each type of refrigerant/lubri-
cant.
Refrigerant container fittings, service hose fittings and service equipment fittings (equipment which handles
refrigerant and/or lubricant) are different between CFC-12 (R-12) and HFC-134a (R-134a). This is to avoid
mixed use of the refrigerants/lubricant.
Adapters that convert one size fitting to another must never be used: refrigerant/lubricant contamination will
occur and compressor malfunction will result.
Tool number
(Kent-Moore No.)
Tool name
Description
HFC-134a (R-134a) refrigerant
Container color: Light blue
Container marking: HFC-134a (R-
134a)
Fitting size: Thread size
●Large container 1/2″ -16 ACME
KLH00-PAGS0
( - )
Nissan A/C System Oil Type S
(DH-PS)
Type: Poly alkylene glycol oil (PAG),
type S (DH-PS)
Application: HFC-134a (R-134a)
swash plate compressors (Nissan
only)
Lubricity: 40 m (1.4 US fl oz., 1.4
Imp fl oz.)
(J-39500-INF)
Recovery/Recycling/
Recharging equipment (ACR4)
Function: Refrigerant Recovery and
Recycling and Recharging
(J-41995)
Electrical leak detector
Power supply:
●DC 12V (Cigarette lighter)
S-NT196
S-NT197
RJIA0195E
AHA281A
PREPARATION
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(J-43926)
Refrigerant dye leak detection kit
Kit includes:
(J-42220)
UV lamp and UV safety goggles
(J-41459)
Refrigerant dye injector
(J-41447)
HFC-134a (R-134a) Fluorescent
leak detection dye
(Box of 24, 1/4 ounce bottles)
(J-43872)
Refrigerant dye cleaner
Power supply:
DC 12V (Battery terminal)
(J-42220)
UV lamp and UV safety goggles
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
(J-41447)
HFC-134a (R-134a) Fluorescent
leak detection dye
(Box of 24, 1/4 ounce bottles)
Application: For HFC-134a (R-134a)
PAG oil
Container: 1/4 ounce (7.4 cc) bottle
(Includes self-adhesive dye
identification labels for affixing to
vehicle after charging system with
dye.)
(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
(J-43872)
Refrigerant dye cleaner For cleaning dye spills
(J-39183)
Manifold gauge set (with hoses
and couplers)
Identification:
●The gauge face indicates HFC-134a
(R-134a).
Fitting size: Thread size
●1/2″ -16 ACME
Tool number
(Kent-Moore No.)
Tool name
Description
ZHA200H
SHA438F
SHA439F
SHA440F
SHA441F
RJIA0196E
ATC-20
PREPARATION
Revision; 2004 April 2003 FX
Commercial Service Tools AJS00145
Service hoses
●High-pressure side hose
(J-39501-72)
●Low-pressure side hose
(J-39502-72)
●Utility hose
(J-39476-72)
Hose color:
●Low hose: Blue with black stripe
●High hose: Red with black stripe
●Utility hose: Yellow with black stripe
or green with black stripe
Hose fitting to gauge:
●1/2″ -16 ACME
Service couplers
●High-pressure side coupler
(J-39500-20)
●Low-pressure side coupler
(J-39500-24)
Hose fitting to service hose:
●M14 x 1.5 fitting is optional or
permanently attached.
(J-39650)
Refrigerant weight scale
For measuring of refrigerant
Fitting size: Thread size
●1/2″ -16 ACME
(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″ -16 ACME
Tool number
(Kent-Moore No.)
Tool name
Description
S-NT201
S-NT202
S-NT200
S-NT203
Tool name Description
Refrigerant identifier equipment Checking for refrigerant purity and
system contamination
Power tool Loosening bolts and nuts
RJIA0197E
PBIC0190E
REFRIGERATION SYSTEM
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REFRIGERATION SYSTEM PFP:KA990
Refrigerant Cycle AJS00146
REFRIGERANT FLOW
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.
FREEZE PROTECTION
Under usual operating conditions, when the A/C is switched on, the compressor runs continuously, and the
evaporator pressure, and therefore, temperature is controlled by the compressor to prevent freeze up.
Refrigerant System Protection AJS00147
REFRIGERANT PRESSURE SENSOR
The refrigerant system is protected against excessively high- or low-pressure by the refrigerant pressure sen-
sor, located on the condenser. If the system pressure rises above, or falls below the specifications, the refrig-
erant pressure sensor detects the pressure inside the refrigerant line and sends the voltage signal to the ECM.
ECM makes the A/C relay go OFF and stops the compressor when pressure on the high-pressure side
detected by refrigerant pressure sensor is over about 2,746 kPa (28 kg/cm2 , 398 psi), or below about 134 kPa
(1.4 kg/cm2 , 20 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 pressure of refrigerant in the system increases to an unusual level [more than 3,727 kPa (38 kg/cm2
, 540 psi)], the release port on the pressure relief valve automatically opens and releases refrigerant into the
atmosphere.
RJIA0849E
ATC-22
REFRIGERATION SYSTEM
Revision; 2004 April 2003 FX
V-6 Variable Displacement Compressor AJS001BE
GENERAL INFORMATION
1. The V-6 variable compressor differs from previous units. The vent temperatures of the V-6 variable com-
pressor do not drop too far below 5°C (41°F) when:
Evaporator intake air temperature is less than 20°C (68°F).
Engine is running at speeds less than 1,500 rpm.
This is because the V-6 compressor provides a means of “capacity” control.
2. The V-6 variable compressor provides refrigerant control under varying conditions. During cold winters, it
may not produce high refrigerant pressure discharge (compared to previous units) when used with air
conditioning systems.
3. A “clanking” sound may occasionally be heard during refrigerant charge. The sound indicates that the tilt
angle of the wobble (swash) plate has changed and is not a malfunction.
4. For air conditioning systems with the V-6 compressor, the clutch remains engaged unless: the system
main switch, fan switch or ignition switch is turned OFF. When ambient (outside) temperatures are low or
when the amount of refrigerant is insufficient, the clutch is disengaged to protect the compressor.
REFRIGERATION SYSTEM
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DESCRIPTION
General
The variable compressor is basically a swash plate type that changes piston stroke in response to the required
cooling capacity.
The tilt of the wobble (swash) plate allows the piston′s stroke to change so that refrigerant discharge can be
continuously changed from 14.5 to 184 cm3 (0.885 to 11.228 cu. in).
RJIA1260E
ATC-24
REFRIGERATION SYSTEM
Revision; 2004 April 2003 FX
Operation
1. Operation Control Valve
–By changing high-pressure valve lift amount, built-in compressor control valve executes the following:
• Controls high-pressure valve discharge amount.
• Changes crankcase pressure in compressor.
• Changes angle of wobble (swash) plate.
–Amount of high-pressure valve loft is determined by factors below.
• Low-pressure applied to diaphragm
• Spring load of set spring
• Balance of magnetic force generated in magnet coil
–Electronic control valve (ECV) magnet coil receives electric signal (duty control) from auto amplifier. Then,
magnetic force generated by electric current is changed to control high-pressure valve lift amount.
2. Maximum Cooling
High-pressure valve is closed by magnetic force generated by electric signal sent from automatic ampli-
fier. At this time, cylinder moves full stroke due to pressure balance between inside crankcase (Pc) and
suction line (Ps).
Under this condition, the wobble (swash) plate is set to the maximum stroke position.
3. Capacity Control
When no electric signal is sent from automatic amplifier (current: OFF), high-pressure valve is opened by
spring force.
Since suction pressure is low, it makes the suction port close and the discharge port open. Thus, crank-
case pressure becomes high as high-pressure enters the crankcase.
–The force acts around the journal pin near the wobble (swash) plate, and is generated by the pressure dif-
ference before and behind the piston.
–The drive lug and journal pin are located where the piston generates the highest pressure. Piston pres-
sure is between suction pressure Ps and discharge pressure Pd, which is near suction pressure Ps. If
crankcase pressure Pc rises due to capacity control, the force around the journal pin makes the wobble
(swash) plate angle decrease and also the piston stroke decrease. In other words, crankcase pressure
RJIA0851E
REFRIGERATION SYSTEM
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increase triggers pressure difference between the piston and the crankcase. The pressure difference
changes the angle of the wobble (swash) plate.
RJIA0852E
ATC-26
REFRIGERATION SYSTEM
Revision; 2004 April 2003 FX
Component Layout AJS00148
RJIA1956E
LUBRICANT
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LUBRICANT PFP:KLG00
Maintenance of Lubricant Quantity in Compressor AJS00149
The lubricant in the compressor circulates through the system with the refrigerant. Add lubricant to compres-
sor when replacing any component or after a large gas leakage occurred. It is important to maintain the speci-
fied amount.
If lubricant quantity is not maintained properly, the following malfunctions may result:
●Lack of lubricant: May lead to a seized compressor
●Excessive lubricant: Inadequate cooling (thermal exchange interference)
LUBRICANT
LUBRICANT RETURN OPERATION
Adjust the lubricant quantity according to the test group shown below.
1. CHECK LUBRICANT RETURN OPERATION
Can lubricant return operation be performed?
●A/C system works properly.
●There is no evidence of a large amount of lubricant leakage.
YES or NO
YES >> GO TO 2.
NO >> GO TO 3.
2. PERFORM LUBRICANT RETURN OPERATION, PROCEEDING AS FOLLOWS:
1. Start engine, and set the following conditions:
–Test condition
Engine speed: Idling to 1,200 rpm
A/C switch: ON
Blower speed: Max. position
Temp. control: Optional [Set so that intake air temperature is 25 to 30°C (77 to 86°F).]
Intake position: Recirculation (REC)
2. Perform lubricant return operation for about 10 minutes.
3. Stop engine.
CAUTION:
If excessive lubricant leakage is noted, do not perform the lubricant return operation.
>> GO TO 3.
3. CHECK COMPRESSOR
Should the compressor be replaced?
YES >> GO TO ATC-29, "LUBRICANT ADJUSTING PROCEDURE FOR COMPRESSOR REPLACE-
MENT" .
NO >> GO TO 4.
Name : NISSAN A/C System Oil Type S
Part number : KLH00-PAGS0
ATC-28
LUBRICANT
Revision; 2004 April 2003 FX
4. CHECK ANY PART
Is there any part to be replaced? (Evaporator, condenser, liquid tank or in case there is evidence of a large
amount of lubricant leakage.)
YES >> GO TO ATC-28, "LUBRICANT ADJUSTING PROCEDURE FOR COMPONENTS REPLACE-
MENT EXCEPT COMPRESSOR" .
NO >> Carry out the A/C performance test.
LUBRICANT ADJUSTING PROCEDURE FOR COMPONENTS REPLACEMENT EXCEPT COM-
PRESSOR
After replacing any of the following major components, add the correct amount of lubricant to the system.
Amount of lubricant to be added
*1: If refrigerant leak is small, no addition of lubricant is needed.
Part replaced
Lubricant to be added to system
Remarks
Amount of lubricant
m (US fl oz., Imp fl oz.)
Evaporator 75 (2.5, 2.6) -
Condenser 35 (1.2, 1.2) -
Liquid tank 10 (0.3, 0.4) -
In case of refrigerant leak 30 (1.0, 1.1) Large leak
- Small leak *1
LUBRICANT
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LUBRICANT ADJUSTING PROCEDURE FOR COMPRESSOR REPLACEMENT
1. Before connecting ACR4 to vehicle, check ACR4 gauges. No refrigerant pressure should be displayed. If
NG, recover refrigerant from equipment lines.
2. Connect ACR4 to vehicle. Confirm refrigerant purity in supply tank using ACR4 and refrigerant identifier. If
NG, refer to ATC-5, "CONTAMINATED REFRIGERANT" .
3. Confirm refrigerant purity in vehicle A/C system using ACR4 and refrigerant identifier. If NG, refer to ATC-
5, "CONTAMINATED REFRIGERANT" .
4. Discharge refrigerant into the refrigerant recovery/recycling equipment. Measure lubricant discharged into
the recovery/recycling equipment.
5. Drain the lubricant from the old (removed) compressor into a graduated container and recover the amount
of lubricant drained.
6. Drain the lubricant from the new compressor into a separate, clean container.
7. Measure an amount of new lubricant installed equal to amount drained from old compressor. Add this
lubricant to new compressor through the suction port opening.
8. Measure an amount of new lubricant equal to the amount recovered during discharging. Add this lubricant
to new compressor through the suction port opening.
9. 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 lubri-
cant at this time.
Do not add this 5 m (0.2 US fl oz., 0.2 Imp fl oz.) of lubricant if only replacing the compressor.
RHA065DD
ATC-30
AIR CONDITIONER CONTROL
Revision; 2004 April 2003 FX
AIR CONDITIONER CONTROL PFP:27500
Description of Air Conditioner LAN Control System AJS0014A
The LAN (Local Area Network) system consists of unified meter and A/C amp., mode door motor, air mix door
motor and intake door motor.
A configuration of these components is shown in the diagram below.
System Construction AJS0014B
A small network is constructed between the unified meter and A/C amp., air mix door motor, mode door motor
and intake door motor. The unified meter and A/C amp. and motors are connected by data transmission lines
and motor power supply lines. The LAN network is built through the ground circuits of the each door motor.
Addresses, motor opening angle signals, motor stop signals and error checking messages are all transmitted
through the data transmission lines connecting the unified meter and A/C amp. and each door motor.
The following functions are contained in LCUs built into the air mix door motor, mode door motor and intake
door motor.
●Address
●Motor opening angle signals
●Data transmission
●Motor stop and drive decision
●Opening angle sensor (PBR function)
●Comparison
●Decision (Unified meter and A/C amp. indicated value and motor opening angle comparison)
OPERATION
The unified meter and A/C amp. receives data from each of the sensors. The unified meter and A/C amp.
sends mode door, air mix door and intake door opening angle data to the mode door motor LCU, air mix door
motor LCU and intake door motor LCU.
The mode door motor, air mix door motor and intake door motor read their respective signals according to the
address signal. Opening angle indication signals received from the unified meter and A/C amp. 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, DEFROST/VENT or FRESH/RECIRCULATION operation is selected. The
new selection data is returned to the unified meter and A/C amp.
SJIA0262E
RJIA1747E
AIR CONDITIONER CONTROL
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TRANSMISSION DATA AND TRANSMISSION ORDER
Unified meter and A/C amp. 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 unified meter and A/C amp. 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 usual, 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 symptoms.
●Unusual electrical frequency
●Poor electrical connections
●Signal leakage from transmission lines
●Signal level fluctuation
Stop signal:
At the end of each transmission, a stop operation, in-operation, or internal error message is delivered to the
unified meter and A/C amp. This completes one data transmission and control cycle.
RJIA1748E
RJIA1749E
ATC-32
AIR CONDITIONER CONTROL
Revision; 2004 April 2003 FX
AIR MIX DOOR CONTROL (AUTOMATIC TEMPERATURE CONTROL)
The air mix door is automatically controlled so that in-vehicle temperature is maintained at a predetermined
value by: The temperature setting, ambient temperature, in-vehicle temperature and amount of sunload.
FAN SPEED CONTROL
Blower speed is automatically controlled based on temperature setting, ambient temperature, in-vehicle tem-
perature, intake temperature, amount of sunload and air mix door position.
When pressing AUTO switch, the blower motor starts to gradually increase air flow volume.
When engine coolant temperature is low, the blower motor operation is delayed to prevent cool air from flow-
ing.
INTAKE DOOR CONTROL
The intake doors are automatically controlled by: The temperature setting, ambient temperature, in-vehicle
temperature, intake temperature, amount of sunload and ON-OFF operation of the compressor.
OUTLET DOOR CONTROL
The outlet door is automatically controlled by: The temperature setting, ambient temperature, in-vehicle tem-
perature, intake temperature and amount of sunload.
MAGNET CLUTCH CONTROL
When A/C switch or DEF switch is pressed, unified meter and A/C amp. inputs compressor ON signal to BCM.
BCM sends compressor ON signal to ECM, via CAN communication line.
ECM judges whether compressor can be turned ON, based on each sensor status (refrigerant-pressure sen-
sor signal, throttle angle, etc.). If it judges compressor can be turned ON, it sends compressor ON signal to
IPDM E/R, via CAN communication line.
Upon receipt of compressor ON signal from ECM, IPDM E/R turns air conditioner relay ON to operate com-
pressor.
When sending compressor ON signal to IPDM E/R via CAN communication line, ECM simultaneously sends
compressor feedback signal to unified meter and A/C amp. via CAN communication line.
Unified meter and A/C amp, then, uses input compressor feedback signal to control air inlet.
SELF-DIAGNOSTIC SYSTEM
The self-diagnostic system is built into the unified meter and A/C amp. to quickly locate the cause of symp-
toms.
RJIA1957E
AIR CONDITIONER CONTROL
ATC-33
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ATC
Revision; 2004 April 2003 FX
Description of Control System AJS0014C
The control system consists of input sensors, switches, the unified meter and A/C amp. (microcomputer) and
outputs.
The relationship of these components is shown in the figure below:
Control Operation AJS0014D
RJIA1958E
RJIA1959E
ATC-34
AIR CONDITIONER CONTROL
Revision; 2004 April 2003 FX
DISPLAY SCREEN
Displays the operational status of the system.
AUTO SWITCH
●The compressor, intake doors, air mix doors, outlet doors and blower speed are automatically controlled
so that the in-vehicle temperature will reach, and be maintained at the set temperature selected by the
operator.
●When pressing AUTO switch, air inlet, air outlet, fan speed, and discharge air temperature are automati-
cally controlled.
TEMPERATURE SWITCH (POTENTIO TEMPERATURE CONTROL) (DRIVER SIDE)
Increases or decreases the set temperature.
TEMPERATURE SWITCH (POTENTIO TEMPERATURE CONTROL) (PASSENGER SIDE)
●Increases or decreases the set temperature.
●When the temperature switch is pressed, the dual switch indicator will automatically illuminate.
RECIRCULATION (REC) SWITCH
●When REC switch is ON, REC switch indicator turns ON, and air inlet is fixed to REC.
●When REC switch is ON and is pressed for approximately 1.5 seconds or longer, REC and FRE switch
indicators blink twice. Then, automatic control mode is entered. Inlet status is displayed even during auto-
matically controlled.
●When FRE switch is turned ON, or when compressor is turned from ON to OFF, REC switch is automati-
cally turned OFF (fixed to FRE mode). REC mode can be re-entered by pressing REC switch again.
●REC switch is not operated when DEF switch is turned ON, or at the D/F position.
FRESH (FRE) SWITCH
●When FRE switch is ON, FRE switch indicator turns ON, and air inlet is fixed to FRE.
●When FRE switch is ON and is pressed for approximately 1.5 seconds or longer, REC and FRE switch
indicators blink twice. Then, automatic control mode is entered. Inlet status is displayed even during auto-
matically controlled.
●When REC switch is turned ON, FRE switch is automatically turned OFF (fixed to REC mode). FRE mode
can be re-entered by pressing FRE switch again.
DEFROSTER (DEF) SWITCH
Positions the air outlet doors to the defrost position. Also positions the intake doors to the fresh air position.
REAR WINDOW DEFOGGER SWITCH
When illumination is ON, rear window is defogged.
OFF SWITCH
The compressor and blower are OFF, the intake doors are set to the fresh air position, and the air outlet doors
are set to the foot (75% foot and 25% defrost) position.
A/C SWITCH
The compressor is ON or OFF.
(Pressing the A/C switch when the AUTO switch is ON will turn off the A/C switch and compressor.)
MODE SWITCH
Controls the air discharge outlets.
FAN SWITCH
Manually control the blower speed. Seven speeds are available for manual control (as shown on the display
screen).
DUAL SWITCH (WITH LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY CON-
TROL SYSTEM)
●When the DUAL switch indicator is not illuminated and the DUAL switch is pressed, the driver-side setting
temperature and passenger-side setting temperature can each be set independently.
●When the DUAL switch indicator is illuminated and the DUAL switch is pressed, the driver-side setting
temperature is applied to both sides.
AIR CONDITIONER CONTROL
ATC-35
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ATC
Revision; 2004 April 2003 FX
Fail-safe Function AJS0014E
●If a communication error exists between unified meter and A/C amp. and A/C and Audio controller for 30
seconds or longer, air conditioner is controlled under following conditions:
–Compressor: ON
–Air outlet: AUTO
–Air inlet: FRE (Fresh)
–Blower fan speed: AUTO
–Set temperature: Setting before communication error occurs.
ATC-36
AIR CONDITIONER CONTROL
Revision; 2004 April 2003 FX
Discharge Air Flow AJS0014F
RJIA1960E
AIR CONDITIONER CONTROL
ATC-37
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Revision; 2004 April 2003 FX
System Description AJS0014G
SWITCHES AND THEIR CONTROL FUNCTION
RJIA1961E
RJIA1962E
ATC-38
AIR CONDITIONER CONTROL
Revision; 2004 April 2003 FX
CAN Communication System Description AJS0014H
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only.
CAN Communication Unit AJS001C4
×: Applicable
Body type Wagon
Axle 2WD AWD
Engine VQ35DE VQ35DE/VK45DE
Transmission A/T
Brake control VDC
Navigation system ××
Low tire pressure warning system ××
ICC system ××
Intelligent Key system ××
Automatic drive positioner ×× ××
CAN communication unit
ECM ××××××
TCM ××××××
Display unit ×× ××
Display control unit ××
Low tire pressure warning control unit ××
AWD control unit ×××
ICC unit ××
Intelligent Key unit ××
Data link connector ××××××
BCM ××××××
Steering angle sensor ××××××
Unified meter and A/C amp. ××××××
ICC sensor ××
ABS actuator and electric unit (control unit) ××××××
Driver seat control unit ×× ××
IPDM E/R ××××××
CAN communication type ATC-39, "TYPE 1/
TYPE2"
ATC-42,
"TYPE 3"
ATC-45, "TYPE 4/
TYPE5"
ATC-48,
"TYPE 6"
AIR CONDITIONER CONTROL
ATC-39
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ATC
Revision; 2004 April 2003 FX
TYPE 1/TYPE2
System Diagram
●Type1
●Type2
Input/output Signal Chart T: Transmit R: Receive
SKIA6171E
SKIA6172E
Signals ECM TCM
Dis-
play
unit
BCM
Steer-
ing
angle
sensor
Unified
meter
and A/
C amp.
ABS
actua-
tor and
electric
unit
(con-
trol
unit)
Driver
seat
control
unit
IPDM
E/R
Engine speed signal T R R R R
Engine status signal T R
Engine coolant temperature signal T R R
A/T self-diagnosis signal R T
Accelerator pedal position signal T R R
Closed throttle position signal T R
Wide open throttle position signal T R
ATC-40
AIR CONDITIONER CONTROL
Revision; 2004 April 2003 FX
Battery voltage signal T R
Key switch signal T R
Ignition switch signal T R R
P range signal T R R
Stop lamp switch signal R T
ABS operation signal R T
TCS operation signal R T
VDC operation signal R T
Fuel consumption monitor signal T R R
Input shaft revolution signal R T
Output shaft revolution signal R T
A/C switch signal R T
A/C compressor request signal T R
A/C relay status signal R T
A/C compressor feedback signal T R
Blower fan motor switch signal R T
A/C control signal TR
RT
Cooling fan speed request signal T R
Cooling fan speed signal R T
Position light request signal R T R R
Low beam request signal T R
Low beam status signal R T
High beam request signal T R R
High beam status signal R T
Front fog light request signal T R
Day time running light request signal T R
Turn LED burnout status signal R T
Vehicle speed signal RT
RRRR T R
Sleep wake up signal T R R R
Door switch signal R T R R R
Turn indicator signal T R
Key fob ID signal T R
Key fob door unlock signal T R
Oil pressure switch signal RT
TR
Buzzer output signal T R
Fuel level sensor signal R T
Fuel level low warning signal R T
Signals ECM TCM
Dis-
play
unit
BCM
Steer-
ing
angle
sensor
Unified
meter
and A/
C amp.
ABS
actua-
tor and
electric
unit
(con-
trol
unit)
Driver
seat
control
unit
IPDM
E/R
AIR CONDITIONER CONTROL
ATC-41
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A
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ATC
Revision; 2004 April 2003 FX
ASCD operation signal T R
ASCD OD cancel request T R
Front wiper request signal T R
Front wiper stop position signal R T
Rear window defogger switch signal T R
Rear window defogger control signal R R R T
Hood switch signal R T
Theft warning horn request signal T R
Horn chirp signal T R
Steering angle sensor signal T R
ABS warning lamp signal RT
VDC OFF indicator lamp signal R T
SLIP indicator lamp signal RT
Brake warning lamp signal RT
System setting signal T R R
A/T CHECK indicator lamp signal T R
A/T position indicator lamp signal T R
A/T shift schedule change demand signal R T
Manual mode signal R T
Not manual mode signal R T
Manual mode shift up signal R T
Manual mode shift down signal R T
Manual mode indicator signal T R
Distance to empty signal R T
Hand brake switch R T
Signals ECM TCM
Dis-
play
unit
BCM
Steer-
ing
angle
sensor
Unified
meter
and A/
C amp.
ABS
actua-
tor and
electric
unit
(con-
trol
unit)
Driver
seat
control
unit
IPDM
E/R
ATC-42
AIR CONDITIONER CONTROL
Revision; 2004 April 2003 FX
TYPE 3
System Diagram
●Type3
Input/output Signal Chart T: Transmit R: Receive
SKIA6173E
Signals ECM TCM
Dis-
play
con-
trol
unit
Low
tire
pres-
sure
warn-
ing
con-
trol
unit
ICC
unit
Intelli-
gent
Key
unit
BCM
Steeri
ng
angle
sen-
sor
Uni-
fied
meter
and
A/C
amp.
ICC
sen-
sor
ABS
actu-
ator
and
elec-
tric
unit
(con-
trol
unit)
Driver
seat
con-
trol
unit
IPDM
E/R
Engine speed signal T R R R R R
Engine status signal T R
Engine coolant tempera-
ture signal TR R R
A/T self-diagnosis signal R T
Accelerator pedal posi-
tion signal TR R R
Closed throttle position
signal TR R
Wide open throttle posi-
tion signal TR
Battery voltage signal T R
Key switch signal T R
Ignition switch signal T R R
P range signal T R R R
Stop lamp switch signal R T
ABS operation signal R R T
TCS operation signal R R T
VDC operation signal R R T
Fuel consumption moni-
tor signal TR R
AIR CONDITIONER CONTROL
ATC-43
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A
B
ATC
Revision; 2004 April 2003 FX
Input shaft revolution sig-
nal RT R
Output shaft revolution
signal RT R
A/C switch signal R T
A/C compressor request
signal T R
A/C relay status signal R T
A/C compressor feed-
back signal TR
Blower fan motor switch
signal RT
A/C control signal TR
RT
Cooling fan speed signal R T
Position light request sig-
nal RTRR
Low beam request signal T R
Low beam status signal R T
High beam request sig-
nal TR R
High beam status signal R T
Front fog light request
signal TR
Day time running light
request signal TR
Turn LED burnout status
signal RT
Vehicle speed signal RRT
RRRR RR TR R
Sleep wake up signal TR RR
TR
Door switch signal R R T R R R
Turn indicator signal T R
Key fob ID signal T R
Key fob door unlock sig-
nal TR
Oil pressure switch sig-
nal
RT
TR
Buzzer output signal
TR
TR
TR
Signals ECM TCM
Dis-
play
con-
trol
unit
Low
tire
pres-
sure
warn-
ing
con-
trol
unit
ICC
unit
Intelli-
gent
Key
unit
BCM
Steeri
ng
angle
sen-
sor
Uni-
fied
meter
and
A/C
amp.
ICC
sen-
sor
ABS
actu-
ator
and
elec-
tric
unit
(con-
trol
unit)
Driver
seat
con-
trol
unit
IPDM
E/R
ATC-44
AIR CONDITIONER CONTROL
Revision; 2004 April 2003 FX
Fuel level sensor signal R T
Fuel level low warning
signal RT
ICC operation signal R T
Front wiper request sig-
nal RT R
Front wiper stop position
signal RT
Rear window defogger
switch signal TR
Rear window defogger
control signal RR R T
Hood switch signal R T
Theft warning horn
request signal TR
Horn chirp signal T R
Steering angle sensor
signal TR
Tire pressure signal T R
Tire pressure data signal R T
ABS warning lamp signal R R T
VDC OFF indicator lamp
signal RRT
SLIP indicator lamp sig-
nal RT
Brake warning lamp sig-
nal RT
System setting signal T R R
Distance to empty signal R T
Hand brake switch signal R T
Door lock/unlock request
signal TR
Door lock/unlock status
signal RT
Starter permission signal T R
Back door open request
signal TR
Power window open
request signal TR
Alarm request signal T R
Key warning signal T R
ICC sensor signal R T
ICC warning lamp signal T R
Signals ECM TCM
Dis-
play
con-
trol
unit
Low
tire
pres-
sure
warn-
ing
con-
trol
unit
ICC
unit
Intelli-
gent
Key
unit
BCM
Steeri
ng
angle
sen-
sor
Uni-
fied
meter
and
A/C
amp.
ICC
sen-
sor
ABS
actu-
ator
and
elec-
tric
unit
(con-
trol
unit)
Driver
seat
con-
trol
unit
IPDM
E/R
AIR CONDITIONER CONTROL
ATC-45
C
D
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A
B
ATC
Revision; 2004 April 2003 FX
TYPE 4/TYPE5
System Diagram
●Type4
ICC system display sig-
nal TR
Current gear position sig-
nal TR R
Steering switch signal T R
ASCD operation signal T R
ASCD OD cancel
request TR
ICC OD cancel request R R T
A/T CHECK indicator
lamp signal TR
A/T position indicator
lamp signal TR
A/T shift schedule
change demand signal R T
Manual mode signal R T
Not manual mode signal R T
Manual mode shift up
signal RT
Manual mode shift down
signal RT
Manual mode indicator
signal TR R
Ignition knob switch sig-
nal TR
Signals ECM TCM
Dis-
play
con-
trol
unit
Low
tire
pres-
sure
warn-
ing
con-
trol
unit
ICC
unit
Intelli-
gent
Key
unit
BCM
Steeri
ng
angle
sen-
sor
Uni-
fied
meter
and
A/C
amp.
ICC
sen-
sor
ABS
actu-
ator
and
elec-
tric
unit
(con-
trol
unit)
Driver
seat
con-
trol
unit
IPDM
E/R
SKIA6174E
ATC-46
AIR CONDITIONER CONTROL
Revision; 2004 April 2003 FX
●Type5
Input/output Signal Chart T: Transmit R: Receive
SKIA6175E
Signals ECM TCM
Dis-
play
unit
AWD
con-
trol
unit
BCM
Steer-
ing
angle
sensor
Uni-
fied
meter
and A/
C
amp.
ABS
actua-
tor
and
elec-
tric
unit
(con-
trol
unit)
Driver
seat
con-
trol
unit
IPDM
E/R
A/T self-diagnosis signal R T
ABS operation signal R R T
TCS operation signal R T
VDC operation signal R R T
Stop lamp switch signal R R T
Battery voltage signal T R
Key switch signal T R
Ignition switch signal T R R
P range signal T R R
Closed throttle position signal T R
Wide open throttle position signal T R
Engine speed signal T R R R R R
Engine status signal T R
Engine coolant temperature signal T R R
Accelerator pedal position signal T R R R
Fuel consumption monitor signal T R R
Input shaft revolution signal R T
Output shaft revolution signal R T
A/C switch signal R T
A/C compressor request signal T R
A/C relay status signal R T
A/C compressor feedback signal T R
AIR CONDITIONER CONTROL
ATC-47
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A
B
ATC
Revision; 2004 April 2003 FX
Blower fan motor switch signal R T
A/C control signal TR
RT
Cooling fan speed signal R T
Position light request signal R T R R
Low beam request signal T R
Low beam status signal R T
High beam request signal T R R
High beam status signal R T
Front fog light request signal T R
Day time running light request signal T R
Turn LED burnout status signal R T
Vehicle speed signal RT
RRR R T R
Sleep wake up signal T R R R
Door switch signal R T R R R
Turn indicator signal T R
Key fob ID signal T R
Key fob door unlock signal T R
Oil pressure switch signal RT
TR
Buzzer output signal T R
Fuel level sensor signal R T
Fuel level low warning signal R T
Front wiper request signal T R
Front wiper stop position signal R T
Rear window defogger switch signal T R
Rear window defogger control signal R R R T
Hood switch signal R T
Theft warning horn request signal T R
Horn chirp signal T R
Steering angle sensor signal T R
ABS warning lamp signal RT
VDC OFF indicator lamp signal R T
SLIP indicator lamp signal RT
Brake warning lamp signal RT
System setting signal T R R
AWD warning lamp signal T R
Signals ECM TCM
Dis-
play
unit
AWD
con-
trol
unit
BCM
Steer-
ing
angle
sensor
Uni-
fied
meter
and A/
C
amp.
ABS
actua-
tor
and
elec-
tric
unit
(con-
trol
unit)
Driver
seat
con-
trol
unit
IPDM
E/R
ATC-48
AIR CONDITIONER CONTROL
Revision; 2004 April 2003 FX
TYPE 6
System Diagram
●Type6
AWD lock indicator lamp signal T R
Distance to empty signal R T
Hand brake switch signal R R T
ASCD operation signal T R
ASCD OD cancel request T R
A/T CHECK indicator lamp signal T R
A/T position indicator lamp signal T R
A/T shift schedule change demand signal R T
Manual mode signal R T
Not manual mode signal R T
Manual mode shift up signal R T
Manual mode shift down signal R T
Manual mode indicator signal T R
Signals ECM TCM
Dis-
play
unit
AWD
con-
trol
unit
BCM
Steer-
ing
angle
sensor
Uni-
fied
meter
and A/
C
amp.
ABS
actua-
tor
and
elec-
tric
unit
(con-
trol
unit)
Driver
seat
con-
trol
unit
IPDM
E/R
SKIA6176E
AIR CONDITIONER CONTROL
ATC-49
C
D
E
F
G
H
I
K
L
M
A
B
ATC
Revision; 2004 April 2003 FX
Input/output Signal Chart T: Transmit R: Receive
Signals ECM TCM
Dis-
play
con-
trol
unit
Low
tire
pres-
sure
warn
ing
con-
trol
unit
AWD
con-
trol
unit
ICC
unit
Intel-
ligen
t Key
unit
BCM
Stee
ring
angl
e
sen-
sor
Uni-
fied
mete
r and
A/C
amp.
ICC
sen-
sor
ABS
actu-
ator
and
elec-
tric
unit
(con-
trol
unit)
Driv
er
seat
con-
trol
unit
IPD
M E/
R
A/T self-diagnosis signal R T
ABS operation signal R R R T
TCS operation signal R R T
VDC operation signal R R R R T
Stop lamp switch signal R R T
Battery voltage signal T R
Key switch signal T R
Ignition switch signal T R R
P range signal T R R R
Closed throttle position sig-
nal TR R
Wide open throttle position
signal TR
Engine speed signal T R R R R R R
Engine status signal T R
Engine coolant temperature
signal TRRR
Accelerator pedal position
signal TR RR R
Fuel consumption monitor
signal TR R
A/T self-diagnosis signal R T
Input shaft revolution signal R T R
Output shaft revolution sig-
nal RT R
A/C switch signal R T
A/C compressor request
signal T R
A/C relay status signal R T
A/C compressor feedback
signal TR
Blower fan motor switch sig-
nal RT
A/C control signal TR
RT
Cooling fan speed signal R T
Position light request signal R T R R
Low beam request signal T R
Low beam status signal R T
High beam request signal T R R
ATC-50
AIR CONDITIONER CONTROL
Revision; 2004 April 2003 FX
High beam status signal R T
Front fog light request sig-
nal TR
Day time running light
request signal TR
Turn LED burnout status
signal RT
Vehicle speed signal RRT
RRRR RR TR R
Sleep wake up signal TR RR
TR
Door switch signal R R T R R R
Key fob ID signal T R
Key fob door unlock signal T R
Oil pressure switch signal RT
TR
Buzzer output signal
TR
TR
TR
Fuel level sensor signal R T
Fuel level low warning sig-
nal RT
ICC operation signal R T
Front wiper request signal R T R
Front wiper stop position
signal RT
Rear window defogger
switch signal TR
Rear window defogger con-
trol signal RR R T
Hood switch signal R T
Theft warning horn request
signal TR
Horn chirp signal T R
Steering angle sensor signal T R
Tire pressure signal T R
Tire pressure data signal R T
ABS warning lamp signal R R T
VDC OFF indicator lamp
signal RRT
SLIP indicator lamp signal RT
Signals ECM TCM
Dis-
play
con-
trol
unit
Low
tire
pres-
sure
warn
ing
con-
trol
unit
AWD
con-
trol
unit
ICC
unit
Intel-
ligen
t Key
unit
BCM
Stee
ring
angl
e
sen-
sor
Uni-
fied
mete
r and
A/C
amp.
ICC
sen-
sor
ABS
actu-
ator
and
elec-
tric
unit
(con-
trol
unit)
Driv
er
seat
con-
trol
unit
IPD
M E/
R
AIR CONDITIONER CONTROL
ATC-51
C
D
E
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H
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K
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M
A
B
ATC
Revision; 2004 April 2003 FX
Brake warning lamp signal RT
System setting signal T R R
AWD warning lamp signal T R
AWD lock indicator lamp
signal TR
Distance to empty signal R T
Hand brake switch signal R R T
Door lock/unlock request
signal TR
Door lock/unlock status sig-
nal RT
Starter permission signal T R
Back door open request sig-
nal TR
Power window open request
signal TR
Alarm request signal T R
Key warning signal T R
ICC sensor signal R T
ICC warning lamp signal T R
ICC system display signal T R
Current gear position signal T R R
Steering switch signal T R
ASCD operation signal T R
ASCD OD cancel request T R
ICC OD cancel request R R T
A/T CHECK indicator lamp
signal TR
A/T position indicator lamp
signal TR
A/T shift schedule change
demand signal R T
Manual mode signal R T
Not manual mode signal R T
Manual mode shift up signal R T
Manual mode shift down
signal RT
Manual mode indicator sig-
nal TR
Ignition knob switch signal T R
Signals ECM TCM
Dis-
play
con-
trol
unit
Low
tire
pres-
sure
warn
ing
con-
trol
unit
AWD
con-
trol
unit
ICC
unit
Intel-
ligen
t Key
unit
BCM
Stee
ring
angl
e
sen-
sor
Uni-
fied
mete
r and
A/C
amp.
ICC
sen-
sor
ABS
actu-
ator
and
elec-
tric
unit
(con-
trol
unit)
Driv
er
seat
con-
trol
unit
IPD
M E/
R
ATC-52
TROUBLE DIAGNOSIS
Revision; 2004 April 2003 FX
TROUBLE DIAGNOSIS PFP:00004
CONSULT-II AJS0014J
CONSULT-II executes the following functions by combining data reception and command transmission via the
communication line from BCM data monitor display.
CONSULT-II BASIC OPERATION
CAUTION:
If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be
detected in self-diagnosis depending on control unit which carry out CAN communication.
1. With the ignition switch OFF, connect CONSULT-II and CON-
SULT-II CONVERTER to the data link connector, then turn the
ignition switch ON.
2. Touch “START (NISSAN BASED VHCL)”.
3. Touch “BCM” on “SELECT SYSTEM” screen. If “BCM” is not
indicated, go to GI-40, "CONSULT-II Data Link Connector (DLC)
Circuit" .
System part Check item, diagnosis mode Description
BCM Data monitor Displays BCM input data in real time.
PBIB1503E
SKIA3098E
SKIA5036E
TROUBLE DIAGNOSIS
ATC-53
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ATC
Revision; 2004 April 2003 FX
DATA MONITOR
Operation Procedure
1. Touch “AIR CONDITIONER” on “SELECT TEST ITEM” screen.
2. Touch “DATA MONITOR” on “SELECT DIAG MODE” screen.
3. Touch either “ALL SIGNALS” or “SELECTION FROM MENU” on
“DATA MONITOR” screen.
4. Touch “START”.
5. When “SELECTION FROM MENU” is selected, touch items to
be monitored. When “ALL SIGNALS” is selected, all the items
will be monitored.
6. Touch “RECORD” while monitoring, then the status of the moni-
tored item can be recorded. To stop recording, touch “STOP”.
Display Item List
SJIA0303E
SJIA0304E
All signals Monitors all the items.
Selection from menu Selects and monitors the individual item selected.
RJIA1111E
Monitor item name “operation or
unit” Contents
IGN ON SW “ON/OFF” Displays “IGN Position (ON)/OFF, ACC Position (OFF)” status as judged from ignition switch signal.
FAN ON SIG “ON/OFF” Displays “FAN (ON)/FAN (OFF)” status as judged from blower fan motor switch signal.
AIR COND SW “ON/OFF” Displays “COMP (ON)/COMP (OFF)” status as judged from air conditioner switch signal.
ATC-54
TROUBLE DIAGNOSIS
Revision; 2004 April 2003 FX
How to Perform Trouble Diagnosis for Quick and Accurate Repair AJS0014K
WORK FLOW
SYMPTOM TABLE
*1 ATC-75, "Operational Check"
SHA900E
Symptom Reference Page
A/C system does not come on. Go to Trouble Diagnosis Procedure for A/C System.
ATC-77, "Power
Supply and Ground
Circuit for Auto
Amp."
A/C system cannot be controlled. ●Go to Integrated Display System.
●Go to Navigation System.
AV-89, "A/C and AV
Switch Self-Diagno-
sis Function" (With-
out navigation
system) or AV-170,
"A/C and AV Switch
Self-Diagnosis
Function" (With
navigation system)
Air outlet does not change. Go to Trouble Diagnosis Procedure for Mode Door Motor. (LAN) ATC-83, "Mode
Door Motor Circuit"
Mode door motor does not operate normally.
Discharge air temperature does not change. Go to Trouble Diagnosis Procedure for Air Mix Door Motor.
(LAN)
ATC-86, "Air Mix
Door Motor Circuit"
Air mix door motor does not operate nor-
mally.
Intake door does not change.
Go to Trouble Diagnosis Procedure for Intake Door Motor. (LAN) ATC-89, "Intake
Door Motor Circuit"
Intake door motor does not operate nor-
mally.
Blower motor operation is malfunctioning.
Go to Trouble Diagnosis Procedure for Blower Motor. ATC-92, "Blower
Motor Circuit"
Blower motor operation is malfunctioning
under out of starting fan speed control.
Magnet clutch does not engage. Go to Trouble Diagnosis Procedure for Magnet Clutch. ATC-98, "Magnet
Clutch Circuit"
Insufficient cooling
Go to Trouble Diagnosis Procedure for Insufficient Cooling. ATC-104, "Insuffi-
cient Cooling"
Go to Diagnostic Procedure for Insufficient Cooling.
ATC-110, "DIAG-
NOSTIC PROCE-
DURE FOR
INSUFFICIENT
COOLING"
Insufficient heating Go to Trouble Diagnosis Procedure for Insufficient Heating. ATC-112, "Insuffi-
cient Heating"
Noise Go to Trouble Diagnosis Procedure for Noise. ATC-113, "Noise"
TROUBLE DIAGNOSIS
ATC-55
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ATC
Revision; 2004 April 2003 FX
Self-diagnosis cannot be performed. Go to Trouble Diagnosis Procedure for Self-diagnosis. ATC-114, "Self-diag-
nosis"
Memory function does not operate. Go to Trouble Diagnosis Procedure for Memory Function. ATC-115, "Memory
Function"
Symptom Reference Page
ATC-56
TROUBLE DIAGNOSIS
Revision; 2004 April 2003 FX
Component Parts and Harness Connector Location AJS0014L
ENGINE COMPARTMENT
RJIA1963E
TROUBLE DIAGNOSIS
ATC-57
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ATC
Revision; 2004 April 2003 FX
PASSENGER COMPARTMENT
RJIA1964E
ATC-58
TROUBLE DIAGNOSIS
Revision; 2004 April 2003 FX
Schematic AJS0014M
TJWM0051E
TROUBLE DIAGNOSIS
ATC-59
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ATC
Revision; 2004 April 2003 FX
Wiring Diagram —A/C— AJS0014N
TJWM0052E
ATC-60
TROUBLE DIAGNOSIS
Revision; 2004 April 2003 FX
TJWM0053E
TROUBLE DIAGNOSIS
ATC-61
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ATC
Revision; 2004 April 2003 FX
TJWM0054E
ATC-62
TROUBLE DIAGNOSIS
Revision; 2004 April 2003 FX
TJWM0055E
TROUBLE DIAGNOSIS
ATC-63
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A
B
ATC
Revision; 2004 April 2003 FX
TJWM0056E
ATC-64
TROUBLE DIAGNOSIS
Revision; 2004 April 2003 FX
Auto Amp. Terminals and Reference Value AJS0014O
Measure voltage between each terminal and ground by following
Terminals and Reference Value for unified meter and A/C amp.
PIN CONNECTOR TERMINAL LAYOUT
TERMINALS AND REFERENCE VALUE FOR UNIFIED METER AND A/C AMP.
RJIA1965E
RJIA1966E
Terminal
No.
Wire
color Item Ignition
switch Condition Voltage
(V)
1 L CAN H - - -
11 R CAN L - - -
21 R/W Power supply for BATT OFF - Battery voltage
22 G/R Power supply for IGN ON - Battery voltage
29 B Ground (Power) ON - Approx. 0
30 B Ground ON - Approx. 0
35 LG/R Power supply for ACC ON - Battery voltage
39 Y Ambient sensor - - -
40 BR/W In-vehicle sensor - - -
41 P Intake sensor - - -
42 R/Y Compressor ON signal ON A/C switch: ON Approx. 0
A/C switch: OFF Approx. 5
43 G/B A/C LAN signal ON -
45 PU/W ECV (Electric Control Valve)
signal ON -
HAK0652D
RJIA1606E
TROUBLE DIAGNOSIS
ATC-65
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ATC
Revision; 2004 April 2003 FX
46 L/W Power supply for IGN2 ON - Battery voltage
49 W/G Sensor ground ON - Approx. 0
50 LG Sunload sensor - - -
53 G Blower motor control signal ACC or
ON Blower speed: 1st step
54 Y/R Power supply for each door
motor ON - Battery voltage
57 BR/Y Blower motor ON signal ACC or
ON
A/C switch: ON (Blower motor
operate) Approx. 0
A/C switch: OFF Approx. 5
Terminal
No.
Wire
color Item Ignition
switch Condition Voltage
(V)
SJIA0116J
ATC-66
TROUBLE DIAGNOSIS
Revision; 2004 April 2003 FX
Self-diagnosis Function AJS0014P
DESCRIPTION
The self-diagnostic system diagnoses sensors, door motors, blower motor, etc. by system line. Refer to appli-
cable sections (items) for details. Shifting from usual control to the self-diagnostic system is accomplished by
starting the engine (turning the ignition switch ON) and pressing “OFF” switch for at least 5 seconds. The
“OFF” switch must be pressed within 10 seconds after starting the engine (ignition switch is turned ON). This
system will be canceled by either pressing AUTO switch or turning the ignition switch OFF. Shifting from one
step to another is accomplished by means of pressing temperature switch (driver side), as required.
Additionally shifting from STEP-5 to AUXILIARY MECHANISM is accomplished by means of pressing (fan)
switch (UP).
RJIA1967E
TROUBLE DIAGNOSIS
ATC-67
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ATC
Revision; 2004 April 2003 FX
FUNCTION CONFIRMATION PROCEDURE
1. SET IN SELF-DIAGNOSTIC MODE
1. Turn ignition switch ON.
2. Set in self-diagnostic mode as follows. Within 10 seconds after starting engine (ignition switch is turned
ON.), press OFF switch for at least 5 seconds.
CAUTION:
●If battery voltage drops below 12V during diagnosis STEP-3, actuator speed becomes slower and
as a result, the system may generate an error even when operation is usual. To avoid this, start
engine before performing this diagnosis.
●Former STEP-1 (LEDs and display screen are checked) does not exist in this self-diagnosis func-
tion.
>> GO TO 2.
2. STEP-2: SENSOR CIRCUITS ARE CHECKED FOR OPEN OR SHORT CIRCUIT
Does code No. 20 appear on the display?
YES >> GO TO 3.
NO >> GO TO 13.
3. CHECK TO ADVANCE SELF-DIAGNOSIS STEP-3
Press temperature (UP) switch (driver side).
Advance to self-diagnosis STEP-3?
YES >> GO TO 4.
NO >> 1. Malfunctioning temperature switch.
2. Replace A/C and AV switch.
4. CHECK TO RETURN SELF-DIAGNOSIS STEP-2
Press temperature (DOWN) switch (driver side).
Return to self-diagnosis STEP-2?
YES >> GO TO 5.
NO >> 1. Malfunctioning temperature switch.
2. Replace A/C and AV switch.
RJIA0219E
ATC-68
TROUBLE DIAGNOSIS
Revision; 2004 April 2003 FX
5. STEP-3: MODE DOOR AND INTAKE DOOR POSITIONS ARE CHECKED
Press temperature (UP) switch (driver side).
Does code No. 30 appear on the display?
YES >> GO TO 6.
NO >> GO TO 14.
6. STEP-4: OPERATION OF EACH DOOR MOTOR IS CHECKED
1. Press temperature (UP) switch (driver side).
2. Press DEF switch. Code No. of each door motor test is indicated
on the display.
>> GO TO 7.
RJIA0220E
RJIA1968E
TROUBLE DIAGNOSIS
ATC-69
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ATC
Revision; 2004 April 2003 FX
7. CHECK ACTUATORS
Refer to the following chart and confirm discharge air flow, air tem-
perature, blower motor voltage and compressor operation.
Checks must be made visually, by listening to any noise, or by touching air outlets with your hand, etc. for
improper operation.
*1: FOOT position during automatic control. Refer to ATC-74, "AUXILIARY MECHANISM: FOOT POSITION
SETTING TRIMMER" .
OK or NG
OK >> GO TO 8.
NG >> ●Air outlet does not change.
Go to Mode Door Motor Circuit. Refer to ATC-83, "Mode Door Motor Circuit" .
●Intake door does not change.
Go to Intake Door Motor Circuit. Refer to ATC-89, "Intake Door Motor Circuit" .
●Blower motor operation is malfunctioning.
Go to Blower Motor Circuit. Refer to ATC-92, "Blower Motor Circuit" .
●Magnet clutch does not engage.
Go to Magnet Clutch Circuit. Refer to ATC-98, "Magnet Clutch Circuit" .
●Discharge air temperature does not change.
Go to Air Mix Door Motor Circuit. Refer to ATC-86, "Air Mix Door Motor Circuit" .
8. STEP-5: TEMPERATURE OF EACH SENSOR IS CHECKED
1. Press temperature (UP) switch (driver side).
2. Code No. 51 appears on the display.
>> GO TO 9.
SJIA0302E
41 42 43 44 45 46
Mode door position VENT B/L 1 B/L 2 FOOT*1 D/F DEF
Intake door position REC REC 20%FRE FRE FRE FRE
Air mix door position FULL COLD FULL COLD FULL HOT FULL HOT FULL HOT FULL HOT
Blower fan duty ratio 37% 91% 65% 65% 65% 91%
Compressor ON ON OFF OFF ON ON
Electronic control
valve (ECV) duty
ratio
100% 100% 0% 0% 50% 100%
ATC-70
TROUBLE DIAGNOSIS
Revision; 2004 April 2003 FX
9. CHECK AMBIENT SENSOR
Press (DEF) switch one time. Temperature detected by ambient
sensor is indicated on the display.
NOTE:
If temperature shown on display greatly differs from actual tempera-
ture, check sensor circuit first, then inspect sensor.
OK or NG
OK >> GO TO 10.
NG >> Go to Ambient Sensor Circuit. Refer to ATC-116, "Ambi-
ent Sensor Circuit" .
10. CHECK IN-VEHICLE SENSOR
Press (DEF) switch a second time. Temperature detected by in-
vehicle sensor is indicated on the display.
NOTE:
If temperature shown on display greatly differs from actual tempera-
ture, check sensor circuit first, then inspect sensor.
OK or NG
OK >> GO TO 11.
NG >> Go to In-vehicle Sensor Circuit. Refer to ATC-119, "In-
vehicle Sensor Circuit" .
11. CHECK INTAKE SENSOR
Press (DEF) switch a third time. Temperature detected by intake
sensor is indicated on the display.
NOTE:
If temperature shown on display greatly differs from actual tempera-
ture, check sensor circuit first, then inspect sensor.
OK or NG
OK >> GO TO 12.
NG >> Go to Intake Sensor Circuit. Refer to ATC-125, "Intake
Sensor Circuit" .
12. CHECK CAN COMMUNICATION ERROR
1. Press (REC) switch.
2. CAN communication error between unified meter and A/C amp.
and DISPLAY UNIT or DISPLAY CONTROL UNIT is detected.
OK or NG
OK >> 1. Turn ignition switch OFF or AUTO switch ON.
2. INSPECTION END
NG >> Go to CAN communication. Refer to BCS-27, "CAN
Communication Inspection Using CONSULT-II (Self-
Diagnosis)" .
●Unified meter and A/C amp. - DISPLAY UNIT
●Unified meter and A/C amp. - DISPLAY CONTROL UNIT
RJIA0223E
RJIA1271E
RJIA1272E
RJIA1969E
TROUBLE DIAGNOSIS
ATC-71
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ATC
Revision; 2004 April 2003 FX
13. CHECK MALFUNCTIONING SENSOR
Refer to the following chart for malfunctioning code No.
(If two or more sensors malfunction, corresponding code Nos. blink respectively twice.)
*1: Perform self-diagnosis STEP-2 under sunshine.
When performing indoors, aim a light (more than 60W) at sunload sensor, otherwise Code No. 25 will indicate
despite that sunload sensor is functioning properly.
*2: ATC-116, "DIAGNOSTIC PROCEDURE FOR AMBIENT SENSOR" .
*3: ATC-120, "DIAGNOSTIC PROCEDURE FOR IN-VEHICLE SENSOR" .
*4: ATC-125, "DIAGNOSTIC PROCEDURE FOR INTAKE SENSOR" .
*5: ATC-122, "DIAGNOSTIC PROCEDURE FOR SUNLOAD SENSOR" .
*6: ATC-80, "DIAGNOSTIC PROCEDURE FOR LAN CIRCUIT" .
>> INSPECTION END
Code No. Malfunctioning sensor (Including circuits) Reference page
21 / −21 Ambient sensor *2
22 / −22 In-vehicle sensor *3
24 / −24 Intake sensor *4
25 / −25 Sunload sensor *1 *5
26 / −26 Air mix door motor PBR (Driver side) *6
27 / −27 Air mix door motor PBR (Passenger side)
RJIA0227E
ATC-72
TROUBLE DIAGNOSIS
Revision; 2004 April 2003 FX
14. CHECK MALFUNCTIONING DOOR MOTOR POSITION SWITCH
Mode or (and) intake door motor PBR (s) is (are) malfunctioning.
(If two or more mode or intake doors are out of order, corresponding code numbers blink respectively twice.)
*1: If mode door motor harness connector is disconnected, the following display pattern will appear.
31→32→33→34→35→36→Return to 31
*2: If intake door motor harness connector is disconnected, the following display pattern will appear.
37→38→39→Return to 37
*3: FOOT position during automatic control. Refer to ATC-74, "AUXILIARY MECHANISM: FOOT POSITION
SETTING TRIMMER" .
*4:ATC-83, "Mode Door Motor Circuit" .
*5:ATC-89, "Intake Door Motor Circuit" .
>> INSPECTION END
Code No. *1 *2 Mode or intake door position Reference page
31 VENT
Mode door motor *4
32 B/L 1
33 B/L 2
34 FOOT*3
35 D/F
36 DEF
37 FRE
Intake door motor *538 20% FRE
39 REC
RJIA0228E
TROUBLE DIAGNOSIS
ATC-73
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ATC
Revision; 2004 April 2003 FX
AUXILIARY MECHANISM: TEMPERATURE SETTING TRIMMER
The trimmer compensates for differences in range of ±3°C (±6°F) between temperature setting (displayed dig-
itally) and temperature felt by driver.
Operating procedures for this trimmer are as follows:
●Begin Self-diagnosis STEP-5 mode. Refer to ATC-66, "Self-diagnosis Function" .
●Press fan (UP) switch to set system in auxiliary mode.
●Display shows 61 in auxiliary mechanism. It takes approximately 3 seconds.
●Press temperature switch (driver side) as desired. Temperature will change at a rate of 0.5°C (1.0°F) each
time a switch is pressed.
CAUTION:
A decimal point is not indicated when the display shows “°C”.
When battery cable is disconnected, trimmer operation is canceled. Temperature set becomes that of initial
condition, i.e. 0°C (0°F).
RJIA1970E
ATC-74
TROUBLE DIAGNOSIS
Revision; 2004 April 2003 FX
AUXILIARY MECHANISM: FOOT POSITION SETTING TRIMMER
Wind distribution ratio in FOOT mode can be set.
Operating procedures for this trimmer are as follows:
●Begin Self-diagnosis STEP-5 mode. Refer to ATC-66, "Self-diagnosis Function" .
●Press fan (UP) switch to set system in auxiliary mode.
●Display shows 61 in auxiliary mechanism. It takes approximately 3 seconds.
●Press the mode switch as desired.
AUXILIARY MECHANISM: INLET PORT MEMORY FUNCTION
When ignition key is turned from OFF to ON, inlet port can be set to AUTO or manual.
Operating procedures for this trimmer are as follows:
●Begin Self-diagnosis STEP-5 mode. Refer to ATC-66, "Self-diagnosis Function" .
●Press fan (UP) switch to set system in auxiliary mode.
●Display shows 61 in auxiliary mechanism. It takes approximately 3 seconds.
●Press the recirculation (REC) and fresh (FRE) switch as desired.
RJIA1971E
Switch
LED status of
REC/FRE
switch
Setting status Setting changeover method
REC ON Manual REC status is memorized. (Initial setting) REC SW: ON
OFF AUTO control
FRE ON Manual FRE status is memorized. FRE SW: ON
OFF AUTO control (Initial setting)
TROUBLE DIAGNOSIS
ATC-75
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ATC
Revision; 2004 April 2003 FX
Operational Check AJS0014Q
The purpose of the operational check is to confirm that the system operates properly.
CHECKING MEMORY FUNCTION
1. Set the temperature to 32°C (90°F).
2. Press OFF switch.
3. Turn ignition switch OFF.
4. Turn ignition switch ON.
5. Press the AUTO switch.
6. Confirm that the set temperature remains at previous tempera-
ture.
7. Press OFF switch.
If NG, go to trouble diagnosis procedure for ATC-115, "Memory
Function" .
If OK, continue with next check.
CHECKING BLOWER
1. Press fan (UP) switch. Blower should operate on low speed. The
fan symbol should have one blade lit.
2. Press fan (UP) switch again, and continue checking blower
speed and fan symbol until all speeds are checked.
3. Leave blower on MAX speed.
If NG, go to trouble diagnosis procedure for ATC-94, "DIAGNOSTIC
PROCEDURE FOR BLOWER MOTOR" .
If OK, continue with next check.
CHECKING DISCHARGE AIR
1. Press MODE switch and DEF switch.
2. Each position indicator should change shape.
3. Confirm that discharge air comes out according to the air distri-
bution table. Refer to ATC-36, "Discharge Air Flow" .
If NG, go to trouble diagnosis procedure for ATC-83, "Mode Door
Motor Circuit" .
If OK, continue with next check.
NOTE:
Confirm that the compressor clutch is engaged (sound or visual
inspection) and intake door position is at FRESH when the DEF or
D/F is selected.
Conditions : Engine running and at usual operating temperature
RJIA1972E
RJIA1973E
RJIA1974E
SJIA0302E
ATC-76
TROUBLE DIAGNOSIS
Revision; 2004 April 2003 FX
CHECKING RECIRCULATION
1. Press recirculation (REC) switch one time. Recirculation indica-
tor should illuminate.
2. Press fresh (FRE) switch one time. Fresh indicator should illumi-
nate.
3. Listen for intake door position change (you should hear blower
sound change slightly).
If NG, go to trouble diagnosis procedure for ATC-89, "Intake Door
Motor Circuit" .
If OK, continue with next check.
NOTE:
Confirm that the compressor clutch is engaged (sound or visual
inspection) and intake door position is at FRESH when the DEF or D/F is selected.
CHECKING TEMPERATURE DECREASE
1. Press temperature (DOWN) switch (driver side) until 18°C
(60°F) is displayed.
2. Check for cold air at discharge air outlets.
If NG, go to trouble diagnosis procedure for ATC-104, "Insufficient
Cooling" .
If OK, continue with next check.
CHECKING TEMPERATURE INCREASE
1. Press temperature (UP) switch (driver side) until 32°C (90°F) is
displayed.
2. Check for hot air at discharge air outlets.
If NG, go to trouble diagnosis procedure for ATC-112, "Insufficient
Heating" .
If OK, continue with next check.
CHECK A/C SWITCH
1. Press AUTO switch and A/C switch.
2. A/C switch indicator will turn ON.
●Confirm that the compressor clutch engages (sound or visual
inspection).
If NG, go to trouble diagnosis procedure for ATC-98, "Magnet Clutch
Circuit" .
If OK, continue with next check.
RJIA1978E
RJIA1976E
RJIA1977E
RJIA1975E
TROUBLE DIAGNOSIS
ATC-77
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ATC
Revision; 2004 April 2003 FX
CHECKING AUTO MODE
1. Press AUTO switch and A/C switch.
2. Display should indicate AUTO.
●Confirm that the compressor clutch engages (sound or visual
inspection). (Discharge air and blower speed will depend on
ambient, in-vehicle, and set temperatures.)
If NG, go to trouble diagnosis procedure for ATC-77, "Power Supply
and Ground Circuit for Auto Amp." , then if necessary, trouble diag-
nosis procedure for ATC-98, "Magnet Clutch Circuit" .
If all operational checks are OK (symptom cannot be duplicated), go
to malfunction Simulation Tests in GI-27, "How to Perform Efficient
Diagnosis for an Electrical Incident" and perform tests as outlined to
simulate driving conditions environment. If symptom appears, refer
to ATC-54, "SYMPTOM TABLE" and perform applicable trouble diagnosis procedures.
Power Supply and Ground Circuit for Auto Amp. AJS001BF
SYMPTOM: A/C system does not come on.
INSPECTION FLOW
RJIA1979E
*1 ATC-78, "DIAGNOSTIC PROCE-
DURE FOR A/C SYSTEM".
*2 ATC-75, "Operational Check".*3AV-89, "A/C and AV Switch Self-
Diagnosis Function".
*4 AV-170, "A/C and AV Switch Self-
Diagnosis Function".
RJIA1980E
ATC-78
TROUBLE DIAGNOSIS
Revision; 2004 April 2003 FX
COMPONENT DESCRIPTION
Unified Meter and A/C Amp. (Automatic Amplifier)
The unified meter and A/C amp. has a built-in microcomputer which
processes information sent from various sensors needed for air con-
ditioner operation. The air mix door motor, mode door motor, intake
door motor, blower motor and compressor are then controlled.
The unified meter and A/C amp. is unitized with control mechanisms.
When the various switches and temperature switch are operated,
data is input to the unified meter and A/C amp. from the DISPLAY
UNIT/DISPLAY CONTROL UNIT using CAN communication.
Self-diagnostic functions are also built into unified meter and A/C
amp. to provide quick check of malfunctions in the auto air condi-
tioner system.
Potentio Temperature Control (PTC)
The PTC is built into the A/C and AV switch. It can be set at an inter-
val of 0.5°C (1.0°F) in the 18°C (60°F) to 32°C (90°F) temperature
range by pressing temperature switch. The set temperature is dis-
played.
DIAGNOSTIC PROCEDURE FOR A/C SYSTEM
SYMPTOM: A/C system does not come on.
RJIA1965E
RJIA1982E
RJIA1983E
TROUBLE DIAGNOSIS
ATC-79
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ATC
Revision; 2004 April 2003 FX
1. CHECK POWER SUPPLY CIRCUIT FOR UNIFIED METER AND A/C AMP.
1. Disconnect unified meter and A/C amp. connector.
2. Check voltage between unified meter and A/C amp. harness
connector M56 terminals 21 (R/W), 22 (G/R) and 35 (LG/R), uni-
fied meter and A/C amp. harness connector M57 terminal 46 (L/
W) and ground.
OK or NG
OK >> GO TO 2.
NG >> Check 10A and 15A fuses [Nos. 6, 10, 11, 12 and 19, located in the fuse block (J/B)]. Refer to PG-
98, "FUSE BLOCK - JUNCTION BOX (J/B)" .
●If fuses are OK, check harness for open circuit. Repair or replace as necessary.
●If fuses are NG, replace fuse and check harness for short circuit. Repair or replace as neces-
sary.
2. CHECK GROUND CIRCUIT FOR UNIFIED METER AND A/C AMP.
1. Turn ignition switch OFF.
2. Check continuity between unified meter and A/C amp. harness
connector M56 terminal 29 (B), 30 (B) and ground.
OK or NG
OK >> Replace unified meter and A/C amp.
NG >> Repair harness or connector.
Terminals Ignition switch position
(+)
(-) OFF ACC ON
Auto amp.
connector
Terminal No.
(wire color)
M56 21 (R/W)
Ground
Battery
voltage
Battery
voltage
Battery
voltage
M56 22 (G/R) Approx. 0V Approx. 0V Battery
voltage
M56 35 (LG/R) Approx. 0V Battery
voltage
Battery
voltage
M57 46 (L/W) Approx. 0V Battery
voltage
Battery
voltage
RJIA1984E
29, 30 – Ground : Continuity should exist.
RJIA1985E
ATC-80
TROUBLE DIAGNOSIS
Revision; 2004 April 2003 FX
LAN System Circuit AJS0014S
SYMPTOM: Mode door motor, intake door motor and/or air mix door motor(s) does not operate normally.
DIAGNOSTIC PROCEDURE FOR LAN CIRCUIT
1. CHECK POWER SUPPLY FOR UNIFIED METER AND A/C AMP.
1. Turn ignition switch ON.
2. Check voltage between unified meter and A/C amp. harness
connector M57 terminal 54 (Y/R) and ground.
OK or NG
OK >> GO TO 2.
NG >> Replace unified meter and A/C amp.
2. CHECK SIGNAL FOR UNIFIED METER AND A/C AMP.
Confirm A/C LAN signal between unified meter and A/C amp. har-
ness connector M57 terminal 43 (G/B) and ground using an oscillo-
scope.
OK or NG
OK >> GO TO 3.
NG >> Replace unified meter and A/C amp.
RJIA1775E
54 – Ground : Battery voltage
RJIA1986E
Terminals
Voltage
(+)
(−)
Auto amp.
connector
Terminal No.
(wire color)
M57 43 (G/B) Ground
RJIA1987E
HAK0652D
TROUBLE DIAGNOSIS
ATC-81
C
D
E
F
G
H
I
K
L
M
A
B
ATC
Revision; 2004 April 2003 FX
3. CHECK POWER SUPPLY FOR MOTOR
Check voltage between mode door motor harness connector M258
terminal 1 (G), driver side air mix door motor harness connector
M252 terminal 1 (G), passenger side air mix door motor harness
connector M257 terminal 1 (G), intake door motor harness connector
M253 terminal 1 (G) and ground.
OK or NG
OK >> GO TO 4.
NG >> Repair harness or connector.
4. CHECK SIGNAL FOR MOTOR
Confirm A/C LAN signal between mode door motor harness connec-
tor M258 terminal 3 (L), driver side air mix door motor harness con-
nector M252 terminal 3 (L), passenger side air mix door motor
harness connector M257 terminal 3 (L), intake door motor harness
connector M253 terminal 3 (G/B) and ground using an oscilloscope.
OK or NG
OK >> GO TO 5.
NG >> Repair harness or connector.
5. CHECK MOTOR GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect door motor connector.
3. Check continuity between mode door motor harness connector
M258 terminal 2 (B), driver side air mix door motor harness con-
nector M252 terminal 2 (B), passenger side air mix door motor
harness connector M257 terminal 2 (B), intake door motor har-
ness connector M253 terminal 2 (B) and ground.
OK or NG
OK >> GO TO 6.
NG >> Repair harness or connector.
1 – Ground : Battery voltage
RJIA1988E
Door motor
Terminals
Voltage
(+)
(−)
Con-
nector
Terminal
No.
(wire
color)
Mode M258 3 (L)
Ground
Air mix
(Driver
side)
M252 3 (L)
Air mix
(Passen-
ger side)
M257 3 (L)
Intake M253 3 (L)
RJIA1989E
HAK0652D
2 – Ground : Continuity should exist.
RJIA1990E
ATC-82
TROUBLE DIAGNOSIS
Revision; 2004 April 2003 FX
6. CHECK MOTOR OPERATION
Disconnect and reconnect the motor connector and confirm the motor operation.
OK or NG
OK >> (Return to operate normally.)
●Poor contact in motor connector
NG >> (Does not operate normally.)
●GO TO 7.
7. CHECK MODE DOOR MOTOR OPERATION
1. Disconnect mode door motor and air mix door motor (driver side, passenger side) connector.
2. Reconnect mode door motor connector and confirm the mode door motor operation.
OK or NG
OK >> (Mode door motor operates normally.)
●GO TO 8.
NG >> (Mode door motor does not operate normally.)
●Replace mode door motor.
8. CHECK AIR MIX DOOR MOTOR OPERATION
1. Disconnect mode door motor connector.
2. Reconnect air mix door motor connector (driver side, passenger side) and confirm the air mix door motor
operation.
OK or NG
OK >> (Air mix door motor operates normally.)
●GO TO 9.
NG >> (Air mix door motor does not operate normally.)
●GO TO 10.
9. CHECK INTAKE DOOR MOTOR OPERATION
1. Disconnect air mix door motor connector (driver side, passenger side).
2. Reconnect intake door motor connector and confirm the intake door motor operation.
OK or NG
OK >> (Intake door motor operates normally.)
●Replace unified meter and A/C amp.
NG >> (Intake door motor does not operate normally.)
●Replace intake door motor.
10. CHECK AIR MIX DOOR MOTOR OPERATION
1. Disconnect air mix door motor (driver side) connector.
2. Confirm the air mix door motor (passenger side) operation.
OK or NG
OK >> (Air mix door motor operates normally.)
●Replace driver side air mix door motor.
NG >> (Air mix door motor does not operate normally.)
●Replace passenger side air mix door motor.
TROUBLE DIAGNOSIS
ATC-83
C
D
E
F
G
H
I
K
L
M
A
B
ATC
Revision; 2004 April 2003 FX
Mode Door Motor Circuit AJS0014T
SYMPTOM:
●Air outlet does not change.
●Mode door motor does not operate normally.
INSPECTION FLOW
*1 ATC-36, "Discharge Air Flow".*2ATC-75, "Operational Check".*3ATC-125, "Intake Sensor Circuit"
*4 ATC-67, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 4 to 6.
*5 ATC-116, "Ambient Sensor Circuit".*6 ATC-119, "In-vehicle Sensor Cir-
cuit".
*7 ATC-122, "Sunload Sensor Circuit".*8ATC-86, "Air Mix Door Motor Cir-
cuit".
*9 ATC-67, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 13.
*10 ATC-80, "DIAGNOSTIC PROCE-
DURE FOR LAN CIRCUIT".
*11 ATC-142, "MODE DOOR MOTOR".*12ATC-54, "SYMPTOM TABLE".
RJIA1991E
ATC-84
TROUBLE DIAGNOSIS
Revision; 2004 April 2003 FX
SYSTEM DESCRIPTION
Component Parts
Mode door control system components are:
●Unified meter and A/C amp.
●Mode door motor (LCU)
●A/C LAN system (PBR built-in mode door motor and air mix door motor)
●In-vehicle sensor
●Ambient sensor
●Sunload sensor
●Intake sensor
System Operation
The unified meter and A/C amp. receives data from each of the sensors. The unified meter and A/C amp.
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 unified meter and A/C amp. 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 unified meter and A/C amp.
RJIA1777E
TROUBLE DIAGNOSIS
ATC-85
C
D
E
F
G
H
I
K
L
M
A
B
ATC
Revision; 2004 April 2003 FX
Mode Door Control Specification
COMPONENT DESCRIPTION
Mode Door Motor
The mode door motor is attached to the heater & cooling unit. It
rotates so that air is discharged from the outlet set by the unified
meter and A/C amp. Motor rotation is conveyed to a link which acti-
vates the mode door.
DIAGNOSTIC PROCEDURE FOR MODE DOOR MOTOR
SYMPTOM: Mode door motor does not operate normally.
Perform diagnostic procedure for ATC-80, "DIAGNOSTIC PROCEDURE FOR LAN CIRCUIT" .
RJIA1778E
RJIA0890E
ATC-86
TROUBLE DIAGNOSIS
Revision; 2004 April 2003 FX
Air Mix Door Motor Circuit AJS0014U
SYMPTOM:
●Discharge air temperature does not change.
●Air mix door motor does not operate.
INSPECTION FLOW
*1 ATC-67, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 4 to 6.
*2 ATC-116, "Ambient Sensor Circuit".*3 ATC-119, "In-vehicle Sensor Cir-
cuit".
*4 ATC-122, "Sunload Sensor Circuit"*5 ATC-88, "Air Mix Door Motor PBR
Circuit".
*6 ATC-67, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 13.
*7 ATC-80, "LAN System Circuit".*8ATC-88, "COMPONENT DESCRIP-
TION".
*9 ATC-143, "AIR MIX DOOR
MOTOR".
*10 ATC-75, "Operational Check".*11ATC-54, "SYMPTOM TABLE".*12ATC-125, "Intake Sensor Circuit".
RJIA1992E
TROUBLE DIAGNOSIS
ATC-87
C
D
E
F
G
H
I
K
L
M
A
B
ATC
Revision; 2004 April 2003 FX
SYSTEM DESCRIPTION
Component Parts
Air mix door control system components are:
●Unified meter and A/C amp.
●Air mix door motor (LCU)
●A/C LAN system (PBR built-in mode door motor and air mix door motor)
●In-vehicle sensor
●Ambient sensor
●Sunload sensor
●Intake sensor
System Operation
The unified meter and A/C amp. receives data from each of the sensors. The unified meter and A/C amp.
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 unified meter and A/C amp. 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 unified meter and A/C amp.
Air Mix Door Control Specification
RJIA1781E
RJIA1782E
ATC-88
TROUBLE DIAGNOSIS
Revision; 2004 April 2003 FX
COMPONENT DESCRIPTION
Air Mix Door Motor
The air mix door motor is attached to the heater & cooling unit. It
rotates so that the air mix door is opened or closed to a position set
by the unified meter and A/C amp. Motor rotation is then conveyed
through a shaft and the air mix door position is then fed back to the
unified meter and A/C amp. by PBR built-in air mix door motor.
DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR
Perform diagnostic procedure for ATC-80, "DIAGNOSTIC PROCEDURE FOR LAN CIRCUIT" .
Air Mix Door Motor PBR Circuit AJS0014V
SYMPTOM:
●Discharge air temperature does not change.
●PBR circuit is open or shorted.
DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR PBR
Perform diagnostic procedure for ATC-80, "DIAGNOSTIC PROCEDURE FOR LAN CIRCUIT" .
RJIA0893E
RJIA0894E
TROUBLE DIAGNOSIS
ATC-89
C
D
E
F
G
H
I
K
L
M
A
B
ATC
Revision; 2004 April 2003 FX
Intake Door Motor Circuit AJS0014W
SYMPTOM:
●Intake door does not change.
●Intake door motor does not operate normally.
INSPECTION FLOW
*1 ATC-67, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 4 to 6.
*2 ATC-116, "Ambient Sensor Circuit".*3 ATC-119, "In-vehicle Sensor Circuit".
*4 ATC-122, "Sunload Sensor Circuit".*5ATC-88, "Air Mix Door Motor PBR
Circuit".
*6 ATC-67, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 13.
*7 ATC-80, "LAN System Circuit".*8ATC-137, "INTAKE DOOR
MOTOR".
*9 ATC-75, "Operational Check".
*10 ATC-54, "SYMPTOM TABLE".*11ATC-125, "Intake Sensor Circuit".
RJIA1993E
ATC-90
TROUBLE DIAGNOSIS
Revision; 2004 April 2003 FX
SYSTEM DESCRIPTION
Component Parts
Intake door control system components are:
●Unified meter and A/C amp.
●Intake door motor (LCU)
●A/C LAN system (PBR built-in mode motor and air mix door motor)
●In-vehicle sensor
●Ambient sensor
●Sunload sensor
●Intake sensor
System Operation
The intake door control determines intake door position based on the ambient temperature, the intake air tem-
perature and the in-vehicle temperature. When the DEFROST, or OFF switches are pushed or A/C switch is
OFF, the unified meter and A/C amp. sets the intake door at the FRESH position.
Intake Door Control Specification
RJIA1786E
RJIA1787E
TROUBLE DIAGNOSIS
ATC-91
C
D
E
F
G
H
I
K
L
M
A
B
ATC
Revision; 2004 April 2003 FX
COMPONENT DESCRIPTION
Intake Door Motor
The intake door motor is attached to the intake unit. It rotates so that
air is drawn from inlets set by the unified meter and A/C amp. Motor
rotation is conveyed to a lever which activates the intake door.
DIAGNOSTIC PROCEDURE FOR INTAKE DOOR MOTOR
SYMPTOM: Intake door motor does not operate normally.
Perform diagnostic procedure for ATC-80, "DIAGNOSTIC PROCEDURE FOR LAN CIRCUIT" .
RJIA0897E
ATC-92
TROUBLE DIAGNOSIS
Revision; 2004 April 2003 FX
Blower Motor Circuit AJS0014X
SYMPTOM:
●Blower motor operation is malfunctioning.
●Blower motor operation is malfunctioning under out of starting fan speed control.
INSPECTION FLOW
*1 ATC-75, "Operational Check".*2ATC-125, "Intake Sensor Circuit".*3ATC-67, "FUNCTION CONFIRMA-
TION PROCEDURE", see No.4.
*4 ATC-67, "FUNCTION CONFIRMA-
TION PROCEDURE", see No.6.
*5 ATC-67, "FUNCTION CONFIRMA-
TION PROCEDURE", see No.13.
*6 ATC-94, "DIAGNOSTIC PROCE-
DURE FOR BLOWER MOTOR".
*7 ATC-54, "SYMPTOM TABLE".*8ATC-116, "Ambient Sensor Circuit".*9ATC-119, "In-vehicle Sensor Circuit".
*10 ATC-122, "Sunload Sensor Circuit".*11EC-197, "DTC P0117, P0118 ECT
SENSOR" (VQ35DE) or EC-845,
"DTC P0117, P0118 ECT SEN-
SOR" (VK45DE).