Workshop Manual GALANT Mitsubishi Automatic Transmission 23

User Manual: Mitsubishi Galant Workshop Automatic Transmission Manual Troubleshoot Mitsubishi Galant Workshop Automatic Transmission |

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AUTOMATIC TRANSMISSION [23]

23-1

AUTOMATIC

TRANSMISSION

CONTENTS 23109000347

SERVICE SPECIFICATIONS 2.................

LUBRICANTS 2..............................

SPECIAL TOOLS 2..........................

TROUBLESHOOTING 4.......................

ON-VEHICLE SERVICE 46...................

Essential Service 46............................

A/T Control Component Location 51.............

A/T Control Component Check 52...............

Torque Converter Stall Test 54..................

Hydraulic Pressure Test 56.....................

Hydraulic Circuit 61............................

Line Pressure Adjustment 62....................

Selector Lever Operation Check 62..............

TRANSMISSION CONTROL* 63..............

TRANSMISSION ASSEMBLY 66..............

WARNING REGARDING SERVICING OF SUPPLEMENTAL RESTRAINT SYSTEM (SRS) EQUIPPED VEHICULES

WARNING!

(1) Improper service or maintenance of any component of the SRS, or any SRS-related component, can lead to personal

injury or death to service personnel (from inadvertent firing of the air bag) or to driver and passenger (from rendering

the SRS inoperative).

(2) Service or maintenance of any SRS component or SRS-related component must be performed only at an authorized

MITSUBISHI dealer.

(3) MITSUBISHI dealer personnel must thoroughly review this manual, and especially its GROUP 52B - Supplemental

Restraint System (SRS) before beginning any service or maintenance of any component of the SRSor any SRS-related

component.

NOTE

The SRS includes the following components: SRS-ECU, SRS warning lamp, air bag module, clock spring, side impact sensors and

interconnecting wiring. Other SRS-related components (that may have to be removed/installed in connection with SRS service or

maintenance) are indicated in the table of contents by an asterisk (*).

AUTOMATIC TRANSMISSION - Service Specifications/

Lubricants/Special Tools

23-2

SERVICE SPECIFICATIONS 23100030222

Items Standard value

Oil temperature sensor kWat 0_C16.5 - 20.5

at 100_C0.57 - 0.69

Resistance of damper clutch control solenoid valve coil (at 20_C) W2.7 - 3.4

Resistance of Low-Reverse solenoid valve coil (at 20_C) W2.7 - 3.4

Resistance of second solenoid valve coil (at 20_C) W2.7 - 3.4

Resistance of underdrive solenoid valve coil (at 20_C) W2.7 - 3.4

Resistance of overdrive solenoid valve coil (at 20_C) W2.7 - 3.4

Stall speed r/min 2,100 - 2,600

LUBRICANTS 23100040034

Items Specified lubricant Quantity L

Transmission fluid DIA QUEEN ATF SPII or equivalent 7.8

SPECIAL TOOLS 23100060214

Tool Number Name Use

MB991502 MUT-II sub

assembly Checking of the diagnosis code

MD998330

(including

MD998331)

Oil pressure gauge

(2,942 kPa) Measurement of oil pressure

MD998332 Adapter

MD998900 Adapter

AUTOMATIC TRANSMISSION - Special Tools 23-3

Tool Number Name Use

MB990635 or

MB991113

Steering linkage

puller

Ball joint disconnection

MB991610 Oil filter wrench Removal and installation of automatic trans-

mission oil filter

GENERAL

SERVICE

TOOL

MZ203827

Engine lifter Supporting the engine assembly during

removal and installation of the transmission

MB991453 Engine hanger

assembly

Supporting the engine assembly during

removal and installation of the transmission

AUTOMATIC TRANSMISSION - Troubleshooting

23-4

TROUBLESHOOTING 23100760275

STANDARD FLOW OF DIAGNOSIS TROUBLESHOOTING

Gathering information from custom-

er.

Check trouble symptoms.

Read the diagnosis code (GROUP 00

- How to Use Troubleshooting/In-

spection Service Points.)

Communication with

MUT-II not possible Inspection procedure No. 1 in

Inspection Chart For Trouble

Symptoms (Refer to P.23-27.)

Diagnosis code

displayed

Erase the diagnosis code (GROUP

00 - How to Use Troubleshooting/In-

spection Service Points.)

No diagnosis code displayed

Carry out the essential service

(Refer to P.23-46.)

Road test (Refer to P.23-6.) Abnormality exists (no diagnosis code)

No abnormality

Recheck diagnosis codes which

were read before the road test.

Abnormality exists

(diagnosis code

present)

Diagnosis

code displayed

No diagnosis

code displayed

To INSPECTION CHART FOR

DIAGNOSIS CODES

(Refer to P.23-14.)

To INSPECTION CHART FOR

TROUBLE SYMPTOMS

(Refer to P.23-26.)

Search for cause.

Found Not found

Repair

Confirmation test (road test)

NG INTERMITTENT MALFUNCTION

(GROUP 00 - Points to Note for

Intermittent Malfunctions.)

OK Completed

AUTOMATIC TRANSMISSION - Troubleshooting 23-5

DIAGNOSIS FUNCTION 23100770186

1. N range lamp

The N range lamp flashes at a frequency of approximately

1 Hz if there is an abnormality in any of the items in the

table below which are related to the A/T system. Check

the diagnosis code output if the N range lamp is flashing

at a frequency of approximately 1 Hz.

N range lamp flashing items

Crank angle sensor

Input shaft speed sensor

Output shaft speed sensor

Each solenoid valve

Out of phase at each shift point

Caution

If the N range lamp is flashing at a frequency of

approximately 2 Hz (faster than at 1 Hz), it means that

the automatic transmission fluid temperature is too high.

Stop the vehicle in a safe place and wait until the N range

lamp switches off.

2. Method of reading the diagnosis code

Use the MUT-II or the N range lamp to take a reading of

the diagnosis codes. (Refer to GROUP 00 - How to Use

Troubleshooting/Inspection Service Points.)

AUTOMATIC TRANSMISSION - Troubleshooting

23-6

ROAD TEST 23100780271

Check by the following procedure.

No. State prior to test

and operation

Test and operation Judgement value Check item Diag-

nosis

code

No.

Inspection

procedure page

if there is an

abnormality

1Ignition switch:

OFF

Ignition switch

(1) ON

Data list No. 54

Battery voltage [V]

Control relay 54 A/T Control

relay system

(23-25)

2Ignition switch:

Engine: Stopped

Selector lever

position: P

Selector lever

position

(1) P, (2) R,

(3) N, (4) D,

(5) 3, (6) 2, (7) L

Data list No. 61

(1) P, (2) R, (3)N,

(4) D, (5) 3, (6) 2,

(7) L

Inhibitor switch -Inhibitor switch

system (23-36)

position: P

Accelerator pedal

(1) Released

(2) Half depressed

(3) Depressed

Data list No. 11

(1) 400 - 1,000 mV

(2) Gradually rises

from (1)

(3) 4,500 - 5,000

Throttle posi-

tion sensor

<Vehicles

without TCL>

Accelerator

pedal position

sensor

<Vehicles with

TCL>

Throttle

position sensor

system (23-15)

Accelerator

pedal position

sensor system

(23-15)

Data list No. 25

(1) OFF

(2) ON

Wide open

throttle switch

25 Wide open

throttle switch

system (23-17)

Brake pedal

(1) Depressed

(2) Released

Data list No. 26

(1) ON

(2) OFF

Stop lamp

switch

26 Stop lamp switch

system (23-18)

3Ignition switch:

Engine: Stopped

Starting test with

lever P or N range

Starting should be

possible

Starting

possible or

impossible

-Starting

impossible

(23-28)

4Warming up Drive for 15

minutes or more so

that the automatic

fluid temperature

becomes 70 -

90_C.

Data list No. 15

Gradually rises to

70 - 90_C

Oil temperature

sensor

15 Oil temperature

sensor system

(23-15)

AUTOMATIC TRANSMISSION - Troubleshooting 23-7

No. State prior to test

and operation

Test and operation Judgement value Check item Diag-

nosis

code

No.

Inspection

procedure page

if there is an

abnormality

5Engine: Idling

Selector lever

position: N

Brake pedal

(Retest)

(1) Depressed

(2) Released

Data list No. 26

(1) ON

(2) OFF

Stop lamp

switch

26 Stop lamp switch

system (23-18)

A/C switch

(1) ON

(2) OFF

Data list No. 65

(1) ON

(2) OFF

Dual pressure

switch

-Dual pressure

switch system

(23-37)

Accelerator pedal

(1) Released

(2) Half depressed

Data list No. 64

(1) ON

(2) OFF

Idle position

switch

-Idle position

switch system

(23-37)

Data list No. 21

(1) 550 - 850 rpm

Gradually rises

from (1)

Crank angle

sensor

21 Crank angle

sensor system

(23-16)

Data list No. 57

(2) Data changes

Communication

with engine-

ECU

<Vehicles

without TCL>

Communication

with TCL-ECU

<Vehicles with

TCL>

51 Serial

communication

system (23-25)

Selector lever

position

(1) N ®D

Should be no

abnormal shifting

shocks

Malfunction

when starting

-Engine stalling

during shifting

(23-30)

(1) N ®D

(2) N ®RTime lag should be

within 2 seconds

-Shocks when

changing from N

to D and large

time lag (23-30)

-Shocks when

changing from N

to R and large

time lag (23-31)

-Shocks when

changing from N

to D,N to R and

large time lag

(23-32)

Driving

impossible

-Does not move

forward (23-28)

-Does not

reverse (23-29)

-Does not move

(forward or

reverse) (23-29)

AUTOMATIC TRANSMISSION - Troubleshooting

23-8

No. State prior to test

and operation

Test and operation Judgement value Check item Diag-

nosis

code

No.

Inspection

procedure page

if there is an

abnormality

6Selector lever

position: N

(Carry out on a

Selector lever

position and

vehicle speed

Data list No. 63

(2) 1st, (4) 3rd, (3)

2nd, (5) 4th

Shift condition - -

flat and straight

road.) (1) Idling in

L range

(Vehicle

stopped)

(2) Driving at

Data list No. 31

(2) 0 %, (4) 100 %,

(3) 100 %, (5) 100

Low and reverse

solenoid valve

31 Low and reverse

solenoid valve

system (23-18)

constant speed

10 km/h in

L position

Data list No. 32

(2) 0 %, (4) 0 %,

(3) 0 %, (5) 100 %

Underdrive

solenoid valve

32 Underdrive

solenoid valve

system (23-18)

(3) Driving at

constant speed

30 km/h in

Data list No. 33

(2)100 %, (4) 100

%, (3) 0 %, (5) 0 %

Second

solenoid valve

33 Second solenoid

valve system

(23-18)

2 position

(4) Driving at

50 km/h in

3 position with

accelerator fully

Data list No. 34

(2) 100 %, (4) 0 %,

(3) 100 %, (5) 0 %

Overdrive

solenoid valve

34 Overdrive

solenoid valve

system (23-18)

closed

(5) Driving at

constant speed

Data list No. 29

(1) 0 km/h

(4) 50 km/h

Vehicle speed

sensor

-Vehicle speed

sensor system

(23-38)

50 km/h in

D position

(Each

condition

Data list No. 22

(4) 1,800 - 2,100

rpm

Input shaft

speed sensor

22 Input shaft speed

sensor system

(23-16)

should be

maintained for

10 seconds or

more.)

Data list No. 23

(4) 1,800 - 2,100

rpm

Output shaft

speed sensor

23 Output shaft

speed sensor

system (23-17)

7Selector lever

position: 3

(Carry out on a

flat and straight

road.)

Selector lever

position and

vehicle speed

(1) Release the ac-

celerator pedal

Data list No. 36

(1) 0 %

(2) Approx. 70 - 90

Damper clutch

control solenoid

valve

Damper clutch

control solenoid

valve system

(23-19)

fully while driv-

ing at 50 km/h

in 3rd gear.

(2) Driving at

constant speed

of 50 km/h in

3rd gear.

Data list No. 52

(1) Approx.

100 - 300 rpm

(2) Approx.

0 - 10 rpm

AUTOMATIC TRANSMISSION - Troubleshooting 23-9

No. State prior to test

and operation

Test and operation Judgement value Check item Diag-

nosis

code

No.

Inspection

procedure page

if there is an

abnormality

8Use the MUT-II to

stop the INVECS-

II function.

Monitor data list

No. 11, 23, and 63

with the MUT-II.

For (1), (2) and (3),

the reading should

be the same as the

Malfunction

when shifting

-Shocks and

running up

(23-32)

Selector lever (1) Accelerate to specified output Displaced -All points (23-33)

position: D

(Carry out on a flat

and straight road.)

4th gear at a

throttle

position

shaft speed and no

abnormal shocks

should occur.

shifting points -Some points

(23-34)

and straight road.) position

sensor output

of 1.5V

should occur.

For (4), (5) and (6),

downshifting Does not shift -No diagnosis

code (23-34)

(accelerator

opening angle

of 30 %).

(2) Gently

should occur

immediately

after the shifting

operation is made.

22 Input shaft

speed sensor

system (23-16)

(2) Gently

decelerate to a

standstill.

(3) Accelerate to

operation is made.

23 Output shaft

speed sensor

system (23-17)

4th gear at a

throttle

position

sensor output

Does not shift

from 1 to 2 or 2

to 1

31 Low and reverse

solenoid valve

system (23-18)

of 2.5 V

(accelerator

opening angle

33 Second

solenoid valve

system (23-18)

of 50%).

(4) While driving at

60 km/h in 4th

gear, shift

41 1st gear ratio is

not specified

(23-20)

down to

3 range.

(5) While driving at

42 2nd gear ratio is

not specified

(23-21)

40 km/h in 3rd

gear, shift

down to

2 range.

Does not shift

from 2 to 3 or 3

to 2

33 Second

solenoid valve

system (23-18)

(6) While driving at

20 km/h in 2nd

gear, shift

down to

34 Overdrive

solenoid valve

system (23-18)

down to

L range. 42 2nd gear ratio is

not specified

(23-21)

43 3rd gear ratio is

not specified

(23-22)

Does not shift

from 3 to 4 or 4

to 3

32 Underdrive

solenoid valve

system (23-18)

33 Second

solenoid valve

system (23-18)

43 3rd gear ratio is

not specified

(23-22)

44 4th gear ratio is

not specified

(23-23)

AUTOMATIC TRANSMISSION - Troubleshooting

23-10

No. State prior to test

and operation

Test and operation Judgement value Check item Diag-

nosis

code

No.

Inspection

procedure page

if there is an

abnormality

9Selector lever

position: N

(Carry out on a

Monitor data list

No. 22

and No. 23 with the

The ratio between

data list No. 22 and

No. 23 should be

Does not shift 22 Input shaft

speed sensor

system (23-16)

(Carry out on a

flat and straight

road.)

MUT-II.

(1) Move selector

lever to

the same as the

gear ratio when

reversing.

23 Output shaft

speed sensor

system (23-17)

R range, drive

at constant

speed of

10 km/h.

46 Reverse gear

ratio is not

specified (23-24)

SHIFT PATTERN

<4G63 engine>

UPSHIFT PATTERN

Output shaft speed r/min

Thick line: Standard shift pattern

100

Throttle opening %

0 1,000 2,000 3,000 4,000 5,000 6,000 7,000

2®3

movement

range 3®4

movement

range

Vehicle speed km/h

0 50 100 150 200

12 23 34

AUTOMATIC TRANSMISSION - Troubleshooting 23-11

DOWNSHIFT PATTERN

3 (L,2) 4

(L,2,3)

Thick line: Standard shift patternThrottle opening %

2¬3

movement

range

3¬4

movement

range

100

0 1,000 2,000 3,000 4,000 5,000 6,000 7,000

Output shaft speed r/min

Vehicle speed km/h

0 50 100

12 23 34

200150

12 (L) 2

HOLD MODE PATTERN

Thick line: Standard shift pattern

Throttle opening %

100

0 2,000 4,000 6,000 8,000

Output shaft speed r/min

Vehicle speed km/h

0 50 100

23 34

200150

AUTOMATIC TRANSMISSION - Troubleshooting

23-12

<6A13 engine>

UPSHIFT PATTERN

Thick line: Standard shift patternThrottle opening %

100

Output shaft speed r/min

Vehicle speed km/h

0 50 100

12 23 34

200150

2®3

movement

range

3®4

movement

range

0 1,000 2,000 3,000 4,000 5,000 6,000 7,000

DOWNSHIFT PATTERN

(L,2,3)

Thick line: Standard shift patternThrottle opening %

2¬3

movement

range 3¬4

movement

range

100

0 1,000 2,000 3,000 4,000 5,000 6,000 7,000

Output shaft speed r/min

Vehicle speed km/h

0 50 100

12 2 3 34

200150

12 (L) 23 (L,2)

AUTOMATIC TRANSMISSION - Troubleshooting 23-13

HOLD MODE PATTERN

Thick line: Standard shift patternThrottle opening %

100

0 2,000 4,000 6,000 8,000

Output shaft speed r/min

Vehicle speed km/h

0 50 100

200150

AUTOMATIC TRANSMISSION - Troubleshooting

23-14

INSPECTION CHART FOR DIAGNOSIS CODE 23100790243

Code Diagnosis item Reference page

11 Throttle position sensor system Short circuit 23-15

12 <Vehicles without TCL>

Accelerator pedal position sensor system Open circuit 23-15

Accelerator pedal position sensor system

<Vehicles with TCL> Sensor maladjustment 23-15

15 Oil temperature sensor system Open circuit 23-15

21 Crank angle sensor system Open circuit 23-16

22 Input shaft speed sensor system Short circuit/open circuit 23-16

23 Output shaft speed sensor system Short circuit/open circuit 23-17

25 Wide open throttle switch system Short circuit 23-17

26 Stop lamp switch system Short circuit/open circuit 23-18

31 Low and reverse solenoid valve system Short circuit/open circuit 23-18

32 Underdrive solenoid valve system Short circuit/open circuit 23-18

33 Second solenoid valve system Short circuit/open circuit 23-18

34 Overdrive solenoid valve system Short circuit/open circuit 23-18

36 Damper control clutch solenoid valve system Short circuit/open circuit 23-19

41 1st gear ratio does not meet the specification 23-20

42 2st gear ratio does not meet the specification 23-21

43 3rd gear ratio does not meet the specification 23-22

44 4th gear ratio does not meet the specification 23-23

46 Reverse gear ratio does not meet the specification 23-24

51 Abnormal communication with engine-ECU <Vehicles without TCL>

Abnormal communication with TCL-ECU <Vehicles with TCL>

23-25

52 Damper control clutch solenoid valve system Defective system 23-19

54 A/T Control relay system Short circuit to earth/

open circuit

23-25

56 N range lamp system Short circuit to earth 23-26

71 Malfunction of A/T-ECU 23-26

AUTOMATIC TRANSMISSION - Troubleshooting 23-15

INSPECTION PROCEDURES FOR DIAGNOSIS CODES

Code No. 11, 12, 14 Throttle position sensor system

<Vehicles without TCL>, accelerator pedal position

sensor <Vehicles with TCL>

Probable cause

If the TPS or APS output voltage is 4.8 V or higher when the engine is idling, the

output is judged to be too high and diagnosis code No. 11 is output. Code No. 11

is also output if there is a problem with the APS and an APS fail-safe signal is received

from the TCL-ECU. If the TPS or APS output voltage is 0.2 V or lower at times

other than when the engine is idling, the output is judged to be too low and diagnosis

code No. 12 is output. If the TPS or APS output voltage is 0.2 V or lower or if it

is 1.2 V or higher when the engine is idling, the TPS or APS adjustment is judged

to be incorrect and diagnosis code No. 14 is output.

DMalfunction of the throttle position sensor <Vehicles

without TCL>

DMalfunction of the accelerator pedal position sensor

DMalfunction of connector

DMalfunction of the A/T-ECU

Throttle position sensor check <Vehicles without TCL>

(Refer to GROUP 13A - On-vehicle Service.)

Accelerator pedal position sensor check<Vehicles with TCL>

(Refer to GROUP 13H - On-vehicle Service.)

NG Replace

Check the following connectors:

B-07 <Vehicles without TCL>, B-41 <Vehicles with TCL>, C-29

NG Repair

Harness check

DBetween throttle position sensor and A/T-ECU

DBetween accelerator pedal position sensor and A/T-ECU

NG Repair

Check the trouble symptoms.

NG Replace the A/T-ECU.

Code No. 15 Oil temperature sensor system Probale cause

If the oil temperature sensor output voltage is 2.6 V or more even after driving for

10 minutes or more (if the oil temperature does not increase), it is judged that there

is an open circuit in the oil temperature sensor and diagnosis code No. 15 is output.

DMalfunction of the oil temperature sensor

DMalfunction of connector

DMalfunction of the A/T-ECU

Oil temperature sensor check (Refer to P.23-52.) NG Replace

Check the follwing connectors: B-70, C-29 NG Repair

Harness check

DBetween oil temperature sensor and A/T-ECU

NG Repair

Check the trouble symptoms.

NG Replace the A/T-ECU.

AUTOMATIC TRANSMISSION - Troubleshooting

23-16

Code No. 21 Crank angle sensor system Probable cause

If no output pulse is detected from the crank angle sensor for 5 seconds or more

while driving at 25 km/h or more, it is judged that there is an open circuit in the

crank angle sensor and diagnosis code No. 21 is output.

DMalfunction of the crank angle sensor

DMalfunction of connector

DMalfunction of the A/T-ECU

Check the follwing connectors: B-77, C-29 NG Repair

Harness check

DBetween crank angle sensor and A/T-ECU

NG Repair

Crank angle sensor system check

(Refer to GROUP 13A - Troubleshooting.)

Check the trouble symptoms.

NG Replace the A/T-ECU.

Code No. 22 Input shaft speed sensor system Probable cause

If no output pulse is detected from the input shaft speed sensor for 1 second or

more while driving in 3rd or 4th gear at a speed of 30 km/h or more, there is judged

to be an open circuit or short-circuit in the input shaft speed sensor and diagnosis

code No. 22 is output. If diagnosis code No. 22 is output four times, the transmission

is locked into 3rd gear (D range) or 2nd gear as a fail-safe measure, and the N

range lamp flashes at a frequency of 1 Hz.

DMalfunction of the input shaft speed sensor

DMalfunction of the underdrive clutch retainer

DMalfunction of connector

DMalfunction of A/T-ECU

L: Refer to the Transmission Workshop Manual.

Replace the A/T-ECU.

A/T overhaul K

DReplace the underdrive clutch

retainer.

Replace the A/T-ECU.

Check the trouble symptoms.

Eliminate the cause of the noise.

Check the trouble symptoms.

Check the following harness:

DBetween the input shaft speed

sensor and the ignition switch

DBetween the input shaft speed

sensor and A/T-ECU

NG Repair

Check the trouble symptoms.

Measure output waveform of the input

shaft speed sensor.

(using an oscilloscope)

DEngine: 2,000 r/min (approx. 50

km/h)

DTransmission: 3rd gear (Voltage)

OK: Conforms to the waveform

shown at page 23-45 (Inspec-

tion procedure using an oscil-

loscope). There is no noise

in the output waveform.

NG Replace the input shaft speed sensor.

Measure at the input shaft speed sensor

connector B-71.

DDisconnect the connector and

measure at the harness side.

(1) Voltage between 3 and earth

(Ignition switch: ON)

OK: Battery voltage

(2) Voltage between 2 and earth

(Ignition switch: ON)

OK approx. 5 V

(3) Continuity between 1 and earth

OK: Continuity

NG Check the following connectors:

B-71, C-29

NG Repair

AUTOMATIC TRANSMISSION - Troubleshooting 23-17

Code No. 23 Output shaft speed sensor system Probable cause

If the output from the output shaft speed sensor is continuously 50% lower than the

vehicle speed for 1 second or more while driving in 3rd or 4th gear at a speed of

30 km/h or more, there is judged to be an open circuit or short-circuit in the output

shaft speed sensor and diagnosis code No. 23 is output.

If diagnosis code No. 23 is output four times, the transmission is locked into 3rd

gear (D range) or 2nd gear as a fail-safe measure, and the N range lamp flashes

at a frequency of 1 Hz.

DMalfunction of the output shaft speed sensor

DMalfunction of the transfer drive gear or driven gear

DMalfunction of connector

DMalfunction of the A/T-ECU

L: Refer to the Transmission Workshop Manual.

A/T overhaul L

DReplace the transfer drive gear and

driven gear.

Check the trouble symptoms.

Eliminate the cause of the noise.

Replace the A/T-ECU.

Check the trouble symptoms.

Check the following harness:

DBetween the output shaft speed

sensor and the ignition switch

DBetween the output shaft speed

sensor and A/T-ECU

NG Repair

Check the trouble symptoms.

Measure output waveform of the output

shaft speed sensor.

(using an oscilloscope)

DEngine: 2,000 r/min

(approx. 50 km/h)

DTransmission: 3rd gear

(Voltage)

OK: Conforms to the waveform

shown at page 23-45 (Inspec-

tion procedure using an oscil-

loscope). There is no noise

in the output waveform.

NG Replace the output shaft speed sensor.

Measure at the output shaft speed sen-

sor connector B-68.

DDisconnect the connector and

measure at the harness side.

(1) Voltage between 3 and earth

(Ignition switch: ON)

OK: Battery voltage

(2) Voltage between 2 and earth

(Ignition switch: ON)

OK: approx. 5 V

(3) Continuity between 1 and earth

OK: Continuity

NG Check the following connectors:

B-68, C-29

NG Repair

Code No. 25 Wide open throttle switch system Probable cause

If the wide open throttle switch is on for 1 second or more with the throttle valve

opening angle at 70% or less, it is judged that there is a short circuit in the wide

open throttle switch and diagnosis code No. 25 is output.

DMalfunction of the wide open throttle switch

DMalfunction of connector

DMalfunction of A/T-ECU

Wide open throttle switch check (Refer to P.23-64). NG Replace

Check the following connectors: C-18, C-30, C-83 NG Repair

Harness check

DBetween the wide open throttle switch and the A/T-ECU.

NG Repair

Check the trouble symptoms.

NG Replace the A/T-ECU.

AUTOMATIC TRANSMISSION - Troubleshooting

23-18

Code No. 26 Stop lamp switch system Probable cause

If the stop lamp switch is on for 5 minutes or more while driving, it is judged that

there is a short circuit in the stop lamp switch and diagnosis code No. 26 is output.

DMalfunction of the stop lamp switch

DMalfunction of connector

DMalfunction of the A/T-ECU

Stop lamp switch check (Refer to GROUP 35 - Brake Pedal.) NG Replace

Check the following connectors: C-02, C-30, C-65, C-83 NG Repair

Harness check

DBetween stop lamp switch and A/T-ECU

NG Repair

Check the trouble symptoms.

NG Replace the A/T-ECU.

Code No. 31 Low and reverse solenoid valve system Probable cause

Code No. 32 Underdrive solenoid valve system

Code No. 33 Second solenoid valve system

Code No. 34 Overdrive solenoid valve system

If the resistance value for a solenoid valve is too large or too small, it is judged

that there is a short-circuit or an open circuit in the solenoid valve and the respective

diagnosis code is output. The transmission is locked into 3rd gear as a fail-safe measure,

and the N range lamp flashes at a frequency of 1 Hz.

DMalfunction of solenoid valve

DMalfunction of connector

DMalfunction of the A/T-ECU

Solenoid valve check (Refer to P.23-54.) NG Replace

Check the following connectors: B-70, C-28, C-30, C-41 NG Repair

Harness check

DBetween solenoid valve and A/T-ECU

NG Repair

Replace the solenoid valve.

Check the trouble symptoms.

NG Replace the A/T-ECU.

AUTOMATIC TRANSMISSION - Troubleshooting 23-19

Code No. 36, 52 Damper clutch control solenoid valve

system Probable cause

If the resistance value for the damper clutch control solenoid valve is too large or

too small, it is judged that there is a short-circuit or an open circuit in the damper

clutch control solenoid valve and diagnosis code No. 36 is output. If the drive duty

rate for the damper clutch control solenoid valve is 100 % for a continuous period

of 4 seconds or more, it is judged that there is an abnormality in the damper clutch

control system and diagnosis code No. 52 is output. When diagnosis code No. 36

is output, the transmission is locked into 3rd gear as a fail-safe measure, and the

N range lamp flashes at a frequency of 1 Hz.

DMalfunction of the damper clutch control solenoid valve

DMalfunction of connector

DMalfunction of the A/T-ECU

Damper clutch control solenoid valve check (Refer to P.23-54.) NG Replace

Check the following connectors: B-70, C-28, C-41 NG Repair

Harness check

DBetween damper clutch control solenoid valve and A/T-ECU

NG Repair

Replace the damper clutch control solenoid valve.

Check the trouble symptoms.

NG Replace the A/T-ECU.

AUTOMATIC TRANSMISSION - Troubleshooting

23-20

Code No. 41 1st gear ratio does not meet the specification Probable cause

If the output from the output shaft speed sensor multiplied by the 1st gear ratio is

not the same as the output from the input shaft speed sensor after shifting to 1st

gear has been completed, diagnosis code No. 41 is output. If diagnosis code No.

41 is output four times, the transmission is locked into 3rd gear as a fail-safe measure,

and the N range lamp flashes at a frequency of 1 Hz.

DMalfunction of the input shaft speed sensor

DMalfunction of the output shaft speed sensor

DMalfunction of the underdrive clutch retainer

DMalfunction of the transfer drive gear or driven gear

DMalfunction of the low and reverse brake system

DMalfunction of the underdrive clutch system

DNoise generated

L: Refer to the Transmission Workshop Manual.

MUT-II Self-Diag code

Is the diagnosis code No. 22 output?

Yes

Code No. 22 Input shaft speed sensor system check

(Refer to P.23-16.)

MUT-II Self-Diag code

Is the diagnosis code No. 23 output?

Yes Code No. 23 Output shaft speed sensor system check

(Refer to P.23-17.)

Measure output waveform from the input shaft speed sensor. (using

an oscilloscope)

DConnect the connector B-71 and measure voltage between

31 and 43 at the A/T-ECU.

DEngine: 2,000 r/min (approx. 50 km/h)

DSelector lever position: 3

(Voltage)

OK: A waveform such as theone shown on P.23-45 (Inspection

Procedure Using an Oscilloscope) is output (flalshing

between 0 ¬® 5V) and there is no noise appearing

in the waveform.

NG Replace the input shaft speed sensor.

Check the trouble symptoms.

A/T overhaul L

DReplace the underdrive clutch retainer.

Check the trouble symptoms.

Eliminate the cause of the noise.

Measure output waveform from the output shaft speed sensor.

(using an oscilloscope)

DConnect the connector B-68 and measure voltage between

32 and 43 at the A/T-ECU.

DEngine: 2,000 r/min (approx. 50 km/h)

DSelector lever position: 3

(Voltage)

OK: A waveform such as theone shown on P.23-45 (Inspection

Procedure Using an Oscilloscope) is output (flalshing

between 0 ¬® 5V) and there is no noise appearing

in the waveform.

NG Replace the output shaft speed sensor.

Check the trouble symptoms.

A/T overhaul L

DReplace the transfer drive gear and driven gear.

Check the trouble symptoms.

Eliminate the cause of the noise.

A/T overhaul L

DUnderdrive clutch system check

(No. 42, No. 43, or no diagnosis code is output).

DLow and reverse brake system check

(No. 46 or no diagnosis code is output).

AUTOMATIC TRANSMISSION - Troubleshooting 23-21

Code No. 42 2nd gear ratio does not meet the specification Probable cause

If the output from the output shaft speed sensor multiplied by the 2nd gear ratio

is not the same as the output from the input shaft speed sensor after shifting to

2nd gear has been completed, diagnosis code No. 42 is output. If diagnosis code

No. 42 is output four times, the transmission is locked into 3rd gear as a fail-safe

measure, and the N range lamp flashes at a frequency of 1 Hz.

DMalfunction of the input shaft speed sensor

DMalfunction of the output shaft speed sensor

DMalfunction of the underdrive clutch retainer

DMalfunction of the transfer drive gear or driven gear

DMalfunction of the second brake system

DMalfunction of the underdrive clutch system

DNoise generated

L: Refer to the Transmission Workshop Manual.

MUT-II Self-Diag code

Is the diagnosis code No. 22 output?

Yes

Code No. 22 Input shaft speed sensor system check

(Refer to P.23-16.)

MUT-II Self-Diag code

Is the diagnosis code No. 23 output?

Yes Code No. 23 Output shaft speed sensor system check

(Refer to P.23-17.)

Measure output waveform from the input shaft speed sensor. (using

an oscilloscope)

DConnect the connector B-71 and measure voltage between

31 and 43 at the A/T-ECU.

DEngine: 2,000 r/min (approx. 50 km/h)

DSelector lever position: 3

(Voltage)

OK: A waveform such as theone shown on P.23-45 (Inspection

Procedure Using an Oscilloscope) is output (flalshing

between 0 ¬® 5V) and there is no noise appearing

in the waveform.

NG Replace the input shaft speed sensor.

Check the trouble symptoms.

A/T overhaul L

DReplace the underdrive clutch retainer.

Check the trouble symptoms.

Eliminate the cause of the noise.

Measure output waveform from the output shaft speed sensor.

(using an oscilloscope)

DConnect the connector B-68 and measure voltage between

32 and 43 at the A/T-ECU.

DEngine: 2,000 r/min (approx. 50 km/h)

DSelector lever position: 3

(Voltage)

OK: A waveform such as theone shown on P.23-45 (Inspection

Procedure Using an Oscilloscope) is output (flalshing

between 0 ¬® 5V) and there is no noise appearing

in the waveform.

NG Replace the output shaft speed sensor.

Check the trouble symptoms.

A/T overhaul L

DReplace the transfer drive gear and driven gear.

Check the trouble symptoms.

Eliminate the cause of the noise.

A/T overhaul L

DUnderdrive clutch system check

(No. 41, No. 43, or no diagnosis code is output).

DSecond brake system check

(No. 44 or no diagnosis code is output).

AUTOMATIC TRANSMISSION - Troubleshooting

23-22

Code No. 43 3rd gear ratio does not meet the specification Probable cause

If the output from the output shaft speed sensor multiplied by the 3rd gear ratio is

not the same as the output from the input shaft speed sensor after shifting to 3rd

gear has been completed, diagnosis code No. 43 is output. If diagnosis code No.

43 is output four times, the transmission is locked into 3rd gear as a fail-safe measure,

and the N range lamp flashes at a frequency of 1 Hz.

DMalfunction of the input shaft speed sensor

DMalfunction of the output shaft speed sensor

DMalfunction of the underdrive clutch retainer

DMalfunciton of the transfer drive gear or driven gear

DMalfunction of the underdrive clutch system

DMalfunction of the overdrive clutch system

DNoise generated

L: Refer to the Transmission Workshop Manual.

MUT-II Self-Diag code

Is the diagnosis code No. 22 output?

Yes

Code No. 22 Input shaft speed sensor system check

(Refer to P.23-16.)

MUT-II Self-Diag code

Is the diagnosis code No. 23 output?

Yes Code No. 23 Output shaft speed sensor system check

(Refer to P.23-17.)

Measure output waveform from the input shaft speed sensor. (using

an oscilloscope)

DConnect the connector B-71 and measure voltage between

31 and 43 at the A/T-ECU.

DEngine: 2,000 r/min (approx. 50 km/h)

DSelector lever position: 3

(Voltage)

OK: A waveform such as theone shown on P.23-45 (Inspection

Procedure Using an Oscilloscope) is output (flalshing

between 0 ¬® 5V) and there is no noise appearing

in the waveform.

NG Replace the input shaft speed sensor.

Check the trouble symptoms.

A/T overhaul L

DReplace the underdrive clutch retainer.

Check the trouble symptoms.

Eliminate the cause of the noise.

Measure output waveform from the output shaft speed sensor.

(using an oscilloscope)

DConnect the connector B-68 and measure voltage between

32 and 43 at the A/T-ECU.

DEngine: 2,000 r/min (approx. 50 km/h)

DSelector lever position: 3

(Voltage)

OK: A waveform such as theone shown on P.23-45 (Inspection

Procedure Using an Oscilloscope) is output (flalshing

between 0 ¬® 5V) and there is no noise appearing

in the waveform.

NG Replace the output shaft speed sensor.

Check the trouble symptoms.

A/T overhaul L

DReplace the transfer drive gear and driven gear.

Check the trouble symptoms.

Eliminate the cause of the noise.

A/T overhaul L

DUnderdrive clutch system check

(No. 41, No. 42, or no diagnosis code is output).

DOverdrive clutch system check

(No. 44 or no diagnosis code is output).

AUTOMATIC TRANSMISSION - Troubleshooting 23-23

Code No. 44 4th gear ratio does not meet thespecification Probable cause

If the output from the output shaft speed sensor multiplied by the 4th gear ratio is

not the same as the output from the input shaft speed sensor after shifting to 4th

gear has been completed, diagnosis code No. 44 is output. If diagnosis code No.

44 is output four times, the transmission is locked into 3rd gear as a fail-safe measure,

and the N range lamp flashes at a frequency of 1 Hz.

DMalfunction of the input shaft speed sensor

DMalfunction of the output shaft speed sensor

DMalfunction of the underdrive clutch retainer

DMalfunction of the transfer drive gear or driven gear

DMalfunction of the second brake system

DMalfunction of the overdrive clutch system

DNoise generated

L: Refer to the Transmission Workshop Manual.

MUT-II Self-Diag code

Is the diagnosis code No. 22 output?

Yes

Code No. 22 Input shaft speed sensor system check

(Refer to P.23-16.)

MUT-II Self-Diag code

Is the diagnosis code No. 23 output?

Yes Code No. 23 Output shaft speed sensor system check

(Refer to P.23-17.)

Measure output waveform from the input shaft speed sensor. (using

an oscilloscope)

DConnect the connector B-71 and measure voltage between

31 and 43 at the A/T-ECU.

DEngine: 2,000 r/min (approx. 50 km/h)

DSelector lever position: 3

(Voltage)

OK: A waveform such as theone shown on P.23-45 (Inspection

Procedure Using an Oscilloscope) is output (flashing be-

tween 0 ¬® 5V) and there is no noise appearing in

the waveform.

NG Replace the input shaft speed sensor.

Check the trouble symptoms.

A/T overhaul L

DReplace the underdrive clutch retainer.

Check the trouble symptoms.

Eliminate the cause of the noise.

Measure output waveform from the output shaft speed sensor.

(using an oscilloscope)

DConnect the connector B-68 and measure voltage between

32 and 43 at the A/T-ECU.

DEngine: 2,000 r/min (approx. 50 km/h)

DSelector lever position: 3

(Voltage)

OK: A waveform such as theone shown on P.23-45 (Inspection

Procedure Using an Oscilloscope) is output (flalshing

between 0 ¬® 5V) and there is no noise appearing

in the waveform.

NG Replace the output shaft speed sensor.

Check the trouble symptoms.

A/T overhaul L

DReplace the transfer drive gear and driven gear.

Check the trouble symptoms.

Eliminate the cause of the noise.

A/T overhaul L

DSecond brake system check

(No. 42 or no diagnosis code is output).

DOverdrive clutch system check

(No. 43 or no diagnosis code is output).

AUTOMATIC TRANSMISSION - Troubleshooting

23-24

Code No. 46 Reverse gear ratio does not meet the

specification Probable cause

If the output from the output shaft speed sensor multiplied by the reverse gear ratio

is not the same as the output from the input shaft speed sensor after shifting to

reverse gear has been completed, diagnosis code No. 46 is output. If diagnosis code

No. 46 is output four times, the transmission is locked into 3rd gear as a fail-safe

measure, and the N range lamp flashes at a frequency of 1 Hz.

DMalfunction of the input shaft speed sensor

DMalfunction of the output shaft speed sensor

DMalfunction of the underdrive clutch retainer

DMalfunciton of the transfer drive gear or driven gear

DMalfunction of the low and reverse brake system

DMalfunction of the reverse clutch system

DNoise generated

L: Refer to the Transmission Workshop Manual.

MUT-II Self-Diag code

Is the diagnosis code No. 22 output?

Yes

Code No. 22 Input shaft speed sensor system check

(Refer to P.23-16.)

MUT-II Self-Diag code

Is the diagnosis code No. 23 output?

Yes Code No. 23 Output shaft speed sensor system check

(Refer to P.23-17.)

Measure output waveform from the input shaft speed sensor. (using

an oscilloscope)

DConnect the connector B-71 and measure voltage between

31 and 43 at the A/T-ECU.

DEngine: 2,000 r/min (approx. 50 km/h)

DSelector lever position: 3

(Voltage)

OK: A waveform such as theone shown on P.23-45 (Inspection

Procedure Using an Oscilloscope) is output (flalshing

between 0 ¬® 5V) and there is no noise appearing

in the waveform.

NG Replace the input shaft speed sensor.

Check the trouble symptoms.

A/T overhaul L

DReplace the underdrive clutch retainer.

Check the trouble symptoms.

Eliminate the cause of the noise.

Measure output waveform from the output shaft speed sensor.

(using an oscilloscope)

DConnect the connector B-68 and measure voltage between

32 and 43 at the A/T-ECU.

DEngine: 2,000 r/min (approx. 50 km/h)

DSelector lever position: 3

(Voltage)

OK: A waveform such as theone shown on P.23-45 (Inspection

Procedure Using an Oscilloscope) is output (flalshing

between 0 ¬® 5V) and there is no noise appearing

in the waveform.

NG Replace the output shaft speed sensor.

Check the trouble symptoms.

A/T overhaul L

DReplace the transfer drive gear and driven gear.

Check the trouble symptoms.

Eliminate the cause of the noise.

A/T overhaul L

DLow and reverse brake system check

(No. 41 or no diagnosis code is output).

DReverse clutch system check (No diagnosis code is output).

AUTOMATIC TRANSMISSION - Troubleshooting 23-25

Code No. 51 Abnormal communication with engine-ECU

Abnormal communication with TCL-ECU

Probable cause

If normal communication is not possible for a continuous period of 1 second or more

when the ignition switch is at the ON position, the battery voltage is 10 V or more

and the engine speed is 450 r/min or more, diagnosis code No. 51 is output. Diagnosis

code No. 51 is also output if the data being received is abnormal for a continuous

period of 4 seconds under the same conditions.

DMalfunction of connector

DMalfunction of the engine-ECU <Vehicles without TCL>

DMalfunction of the TCL-ECU <Vehicles with TCL>

DMalfunction of the A/T-ECU

Replace the A/T-ECU.

Check the trouble symptoms.

Replace the engine-ECU.

Replace the TCL-ECU.

Check the trouble symptoms.

Harness check

DBetween engine-ECU and A/T-ECU

DBetween TCL-ECU and A/T-ECU

NG Repair

Check the following connectors:

DC-30, C-34, C-38

<4G6-vehicles without TCL>

DC-30, C-37

<6A1-vehicles without TCL>

DC-10, C-30, C-51

NG Repair

Code No. 54 A/T control relay system Probable cause

If the A/T control relay voltage is less than 7 V after the ignition switch has been

turned ON, it is judged that there is an open circuit or a short-circuit in the A/T control

relay earth and diagnosis code No. 54 is output.

Then the transmission is locked into 3rd gear as a fail-safe measure, and the N

range lamp flashes at a frequency of 1 Hz.

DMalfunction of the A/T control relay

DMalfunction of connector

DMalfunction of the A/T-ECU

Check the A/T control relay. (Refer to P.23-53.) NG Replace

Check the following connectors: B-30, C-28, C-30, C-41, C-45 NG Repair

Harness check

DBetween control relay and body earth

DBetween control relay and battery

DBetween control relay and A/T-ECU

NG Repair

Check the trouble symptoms.

NG Replace the A/T-ECU.

AUTOMATIC TRANSMISSION - Troubleshooting

23-26

Code No. 56 N range lamp system Probable cause

If the N range signal is off after an N range lamp illumination instruction (ON instruction)

has been given, it is judged that there is a short-circuit in the N range lamp earth

and diagnosis code No. 56 is output.

DMalfunction of the N range lamp bulb

DMalfunction of connector

DMalfunction of the A/T-ECU

Check the N range lamp bulb

(Refer to GROUP 52A - Instrument Panel.)

NG Replace

Check the following connectors: C-30, C-90, D-02 NG Repair

Harness check

DBetween N range lamp bulb and A/T-ECU

NG Repair

Check the trouble symptoms.

NG Replace the A/T-ECU.

Code No. 71 Malfunction of A/T-ECU Probale cause

There is an abnormality in the A/T-ECU. The transmission is locked into 3rd gear

as a fail-safe measure.

DMalfunction of the A/T-ECU

Replace the A/T-ECU.

INSPECTION CHART FOR TROUBLE SYMPTOMS 23100800267

Trouble symptom Inspection

procedure No.

Reference

page

Communication with MUT-II is not possible 123-27

Driving impossible Starting impossible 223-28

Does not move forward 323-28

Does not reverse 423-29

Does not move (forward or reverse) 523-29

Malfunction when starting Engine stalling when shifting 623-30

Shocks when changing from N to D and large time lag 723-30

Shocks when changing from N to R and large time lag 823-31

Shocks when changing from N to D, N to R and large

time lag

923-32

Malfunction when shifting Shocks and running up 10 23-32

AUTOMATIC TRANSMISSION - Troubleshooting 23-27

Trouble symptom Reference

page

Inspection

procedure No.

Displaced shifting points All points 11 23-33

Some points 12 23-34

Does not shift No diagnosis codes 13 23-34

Malfunction while driving Poor acceleration 14 23-35

Vibration 15 23-35

Inhibitor switch system 16 23-36

Mode control switch system 17 23-36

Idle position switch system 18 23-37

Dual pressure switch system 19 23-37

Vehicle speed sensor system 20 23-38

Auto-cruse-ECU signal system 21 23-38

INSPECTION PROCEDURE FOR TROUBLE SYMPTOMS

INSPECTION PROCEDURE 1

Communication with MUT-II is not possible Probable cause

If communication with the MUT-II is not possible, the cause is probably a defective

diagnosis line or the A/T-ECU is not functioning.

DMalfunction of diagnosis line

DMalfunction of connector

DMalfunction of the A/T-ECU

Is communication with other systems

possible using the MUT-II?

No Check the diagnosis line with MUT-II,

and repair if necessary.

Yes

Check the continuity and voltage of the

A/T-ECU connector.

DDisconnect the connector C-28 and

check at harness side.

DVoltage between terminals No. 11,

24 and earth

OK: Battery voltage

DVoltage between C-28 terminals

Nos.12, 13, 25, 26, C-30 terminal

No. 72 and earth

OK: Continuity

NG Check the following connectors:

C-28, C-30, C-45, C-83, C-131, C-134

NG Repair

Harness check

DBetween power supply and

A/T-ECU

DBetween earth and A/T-ECU

NG Repair

Check the trouble symptoms.

Repalce the A/T-ECU.

Check the following connectors:

C-20, C-28, C-30, C-49, C-66, C-83

NG Repair

Harness check

DBetween diagnosis connector and

A/T-ECU

NG Repair

Check the trouble symptoms. NG Replace the A/T-ECU.

AUTOMATIC TRANSMISSION - Troubleshooting

23-28

INSPECTION PROCEDURE 2

Starting impossible Probable cause

Starting is not possible when the selector lever is in P or N range.In such cases,

the cause is probably a defective engine system, torque converter or oil pump.

DMalfunction of the engine system

DMalfunction of the torque converter

DMalfunction of the oil pump

L: Refer to the Transmission Workshop Manual.

Check the engine system.

DControl system, ignition system, fuel system, main engine

system

NG Repair, replace

Torque converter check

DCheck for incorrect installation (inserted at an angle, etc.) and

for damaged splines.

NG Repair if possible. If the splines are damaged and repairs are not

possible, replace the torque converter assembly.

Repalce the oil pump assembly. L

(The oil pump cannot be disassembled.)

INSPECTION PROCEDURE 3

Does not move (forward) Probable cause

If the vehicle does not move forward when the selector lever is shifted from N to

D, 3, 2 or L range while the engine is idling, the cause is probably abnormal line

pressure or a malfunction of the underdrive clutch or valve body.

DAbnormal line pressure

DMalfunction of the underdrive solenoid valve

DMalfunction of the underdrive clutch

DMalfunction of the valve body

L: Refer to the Transmission Workshop Manual.

MUT-II Actuator test

DNo. 2 Underdrive solenoid valve

OK: Sound of operation can be heard.

Replace the solenoid valve. L

Hydraulic pressure test (Refer to P.23-56.)

DMeasure the hydraulic pressure for each element when in L

range.

Standard value: Refer to P.23-57.

NG Valve body disassembly, cleaning and reassembly L

DPay particular attention to loosening of bolts, and to damage

and slippage of O-rings, valves and valve bodies.

DIf the damage cannot be repaired, replace the valve body

assembly.

Underdrive clutch system check L

DRemove the transmission assembly, valve body cover and valve

body.

DPistons should operate and pressure should be maintained

when air is blown through the underdrive clutch oil hole in the

transmission case.

NG Underdrive clutch check L

DCheck for burning of the facing, defective piston seal rings

and interference at the retainer.

AUTOMATIC TRANSMISSION - Troubleshooting 23-29

INSPECTION PROCEDURE 4

Does not reverse Probable cause

If the vehicle does not reverse when the selector lever is shifted from N to R range

while the engine is idling, the cause is probably abnormal pressure in the reverse

clutch or low and reverse brake or a malfunction of the reverse clutch, low and reverse

brake or valve body.

DAbnormal reverse clutch pressure

DAbnormal low and reverse brake pressure

DMalfunction of the low and reverse solenoid valve

DMalfunction of the reverse clutch

DMalfunction of the low and reverse brake

DMalfunction of the valve body

L: Refer to the Transmission Workshop Manual.

MUT-II Actuator test

DNo. 1 Low and reverse solenoid valve

OK: Sound of operation can be heard.

Replace the low and reverse solenoid valve. L

Hydraulic pressure check (Refer to P.23-56.)

DMeasure the reverse clutch pressure in R range.

Standard value: Refer to P.23-57.

Hydraulic pressure check (Refer to P.23-56.)

DMeasure the low and reverse brake pressure in R range.

Standard value: Refer to P.23-57.

Reverse clutch system and low and reverse brake system check

DRemove the transmission assembly, valve body cover and valve

body.

DPistons should operate and pressure should be maintained

when air is blown through the reverse clutch oil hole and the

low reverse brake oil hole in the transmission case.

NG Reverse clutch and low and reverse brake check L

DCheck for burning of the facing, defective piston seal rings

and interference at the retainer.

Valve body disassembly, cleaning and reassembly L

DPay particular attention to loosening of bolts, and to damage

and slippage of O-rings, valves and valve bodies.

DIf the damage cannot be repaired, replace the valve body

assembly.

INSPECTION PROCEDURE 5

Does not move (forward or reverse) Probable cause

If the vehicle does not move forward or reverse when the selector lever is shifted

to any position while the engine is idling, the cause is probably abnormal line pressure,

or a malfunction of the power train, oil pump or valve body.

DAbnormal line pressure

DMalfunction of power train

DMalfunction of the oil pump

DMalfunction of the valve body

L: Refer to the Transmission Workshop Manual.

Hydraulic pressure check (Refer to P.23-56.)

DMeasure the hydraulic pressure for each element when moving

forward and back.

Standard value: Refer to P.23-57.

Power train check L

DDisassemble the transmission, check the condition of the

planetary carrier, output shaft and differential, etc.

Replace the oil pump assembly. L

(The oil pump cannot be disassembled.)

NG Valve body disassembly, cleaning and reassembly L

DPay particular attention to loosening of bolts, and to damage

and slippage of O-rings, valves and valve bodies.

DIf the damage cannot be repaired, replace the valve body

assembly.

AUTOMATIC TRANSMISSION - Troubleshooting

23-30

INSPECTION PROCEDURE 6

Engine stalling when shifting Probable cause

If the engine stalls when the selector lever is shifted from N to D or R range while

the engine is idling, the cause is probably a malfunction of the engine system, damper

clutch solenoid valve, valve body or torque converter (damper clutch malfunction).

DMalfunction of the engine system

DMalfunction of the damper clutch control solenoid valve

DMalfunction of the valve body

DMalfunction of the torque converter (Malfuction of the

damper clutch)

L: Refer to the Transmission Workshop Manual.

Engine system check

DCheck the control system, ignition system, fuel system and

main system.

NG Repair, replace

Replace the damper clutch control solenoid valve.

Valve body disassembly, cleaning and reassembly L

DPay particular attention to loosening of bolts, and to damage

and slippage of O-rings, valves and valve bodies.

DIf the damage cannot be repaired, replace the valve body

assembly.

NG Repalce the torque converter.

INSPECTION PROCEDURE 7

Shocks when changing from N to D and large time lag Probable cause

If abnormal shocks or a time lag of 2 seconds or more occur when the selector

lever is shifted from N to D range while the engine is idling, the cause is probably

abnormal underdrive clutch pressure or a malfunction of the underdrive clutch, valve

body or idle position switch.

DAbnormal underdrive clutch pressure

DMalfunction of the underdrive solenoid valve

DMalfunction of the underdrive clutch

DMalfunction of the valve body

DMalfunction of the idle position switch

L: Refer to the Transmission Workshop Manual.

MUT-II Actuator test

DNo. 2 Underdrive solenoid valve

OK: Sound of operation can be heard.

Replace the underdrive solenoid valve. L

When does the shock occur?

When starting

Shocks sometimes occur

No Yes

MUT-II Data list

DNo. 64 Idle position switch

OK: Turns from on to off when the accelerator pedal is slightly

depressed from the fully closed position.

OK NG

Idle position switch check

DINSPECTION PROCEDURE 18 - Idle position switch system

check (Refer to P.23-37.)

Valve body disassembly, cleaning and reassembly L

DPay particular attention to loosening of bolts, and to damage

and slippage of O-rings, valves and valve bodies.

DIf the damage cannot be repaired, replace the valve body

assembly.

When shifting

Hydraulic pressure test (Refer to P.23-56.)

DMeasure the underdrive clutch pressure when shifting from

NtoD.

Standard value: Refer to P.23-57.

Underdrive clutch system check L

DRemove the transmission assembly, valve body cover and valve

body.

DPistons should operate and pressure should be maintained

when air is blown through the underdrive clutch oil hole in the

transmission case.

Underdrive clutch check L

DCheck for burning of the facing, defective piston seal rings

and interference at the retainer.

AUTOMATIC TRANSMISSION - Troubleshooting 23-31

INSPECTION PROCEDURE 8

Shocks when changing from N to R and large time lag Probable cause

If abnormal shocks or a time lag of 2 seconds or more occurs when the selector

lever is shifted from N to R range while the engine is idling, the cause is probably

abnormal reverse clutch pressure or low and reverse brake pressure, or a malfunction

of the reverse clutch, low and reverse brake, valve body or idle position switch.

DAbnormal reverse clutch pressure

DAbnormal low and reverse brake pressure

DMalfunction of the low and reverse solenoid valve

DMalfunction of the reverse clutch

DMalfunction of the low and reverse brake

DMalfunction of the valve body

DMalfunction of the idle position switch

L: Refer to the Transmission Workshop Manual.

MUT-II Actuator test

DNo. 1 Low and reverse solenoid valve

OK: Sound of operation can be heard.

Replace the low and reverse solenoid valve. L

When does the shock occur?

When starting

Shocks sometimes occur

No Yes

MUT-II Data list

DNo. 64 Idle position switch

OK: Turns from on to off when the accelerator pedal is slightly

depressed from the fully closed position.

OK NG

Idle position switch check

DINSPECTION PROCEDURE 18 - Idle position switch system

check (Refer to P.23-37.)

Valve body disassembly, cleaning and reassembly L

DPay particular attention to loosening of bolts, and to damage

and slippage of O-rings, valves and valve bodies.

DIf the damage cannot be repaired, replace the valve body

assembly.

When shifting

Hydraulic pressure test (Refer to P.23-56.)

DMeasure the reverse clutch pressure in R range.

Standard value: Refer to P.23-57.

Hydraulic pressure test (Refer to P.23-56.)

DMeasure the low and reverse brake pressure in R range.

Standard value: Refer to P.23-57.

Reverse clutch system and low reverse brake system check L

DRemove the transmission assembly, valve body cover and valve

body.

DPistons should operate and pressure should be maintained

when air is blown through the reverse clutch oil hole and low

and reverse brake oil hole in the transmission case.

Reverse clutch and low reverse brake check L

DCheck for burning of the facing, defective piston seal rings

and interference at the retainer.

AUTOMATIC TRANSMISSION - Troubleshooting

23-32

INSPECTION PROCEDURE 9

Shocks when changing from N to D, N to R and large time

lag Probable cause

If abnormal shocks or a time lag of 2 seconds or more occur when the selector

lever is shifted from N to D range and from N to R range while the engine is idling,

the cause is probably abnormal line pressure or a malfunction of the oil pump or

valve body.

DAbnormal line pressure

DMalfunction of the oil pump

DMalfunction of the valve body

When does the shock occur?

When

starting Valve body disassembly, cleaning and reassembly L

DPay particular attention to loosening of bolts, and to damage

and slippage of O-rings, valves and valve bodies.

DIf the damage cannot be repaired, replace the valve body

assembly.

L: Refer to the Transmission Workshop Manual.

Hydraulic pressure test (Refer to P.23-56.)

DMeasure the hydraulic pressure for each element when in D

range and R range.

Standard value: Refer to P.23-57.

Adjust the line pressure. (Refer to P.23-62.)

When shifting

Replace the oil pump assembly. L

(The oil pump cannot be disassembled.)

INSPECTION PROCEDURE 10

Shocks and running up Probable cause

If shocks occur when driving due to upshifting or downshifting and the transmission

speed becomes higher than the engine speed, the cause is probably abnormal line

pressure or a malfunction of a solenoid valve, oil pump, valve body or of a brake

or clutch.

DAbnormal line pressure

DMalfunction of each solenoid valve

DMalfunction of the oil pump

DMalfunction of the valve body

DMalfunction of each brake or each clutch

L: Refer to the Transmission Workshop Manual.

MUT-II Actuator test

DNo. 1 Low and reverse solenoid valve

DNo. 2 Underdrive solenoid valve

DNo. 3 Second solenoid valve

DNo. 4 Overdrive solenoid valve

OK: Sound of operation can be heard.

Replace the solenoid valve.

Adjust the line pressure. (Refer to P.23-62.)

NG Replace the oil pump assembly. L

(The oil pump cannot be disassembled.)

Valve body disassembly, cleaning and reassembly L

DPay particular attention to loosening of bolts, and to damage

and slippage of O-rings, valves and valve bodies.

DIf the damage cannot be repaired, replace the valve body

assembly.

Clutch and brake check L

DCheck for burning of the facing, defective piston seal rings

and interference at the retainer.

AUTOMATIC TRANSMISSION - Troubleshooting 23-33

INSPECTION PROCEDURE 11

All points (Displaced shifting points) Probable cause

If all shift points are displaced while driving, the cause is probably a malfunction

of the output shaft speed sensor, TPS or of a solenoid valve.

DMalfunction of the output shaft speed sensor

DMalfunction of the throttle position sensor

DMalfunction of each solenoid valve

DAbnormal line pressure

DMalfunction of the valve body

DMalfunction of the A/T-ECU

L: Refer to the Transmission Workshop Manual.

MUT-II Data list

DNo. 23 Output shaft speed sensor

OK: Increases in proportion to vehicle speed.

Code No. 23 - Output shaft speed sensor system (Refer to P.23-17.)

MUT-II Data list

DNo. 11 TPS/APS

OK: Increases in proportion to accelerator pedal opening angle

NG Code No. 11, 12, 14 TPS/APS system check (Refer to P.23-15.)

MUT-II Data list

DNo. 31 Low and reverse solenoid valve duty %

DNo. 32 Underdrive solenoid valve duty %

DNo. 33 Second solenoid valve duty %

DNo. 34 Overdrive solenoid valve duty %

OK: Refer to the table below.

NG Replace the solenoid valve. L

Repalce the A/T-ECU.

Adjust the line pressure. (Refer to P.23-62.)

NG Valve body disassembly, cleaning and reassembly L

DPay particular attention to loosening of bolts, and to damage

and slippage of O-rings, valves and valve bodies.

DIf the damage cannot be repaired, replace the valve body

assembly.

No. 31 No. 32 No. 33 No. 34

Driving at constant speed in 1st gear 0% 0% 100 % 100 %

Driving at constant speed in 2nd gear 100 % 0% 0% 100 %

Driving at constant speed in 3rd gear 100 % 0% 100 % 0%

Driving at constant speed in 4th gear 100 % 100 % 0% 0%

AUTOMATIC TRANSMISSION - Troubleshooting

23-34

INSPECTION PROCEDURE 12

Some points (Displaced shifting points) Probable cause

If some of the shift points are displaced while driving, the cause is probably a malfunction

of the valve body, or it is related to control and is not an abnormality.

DMalfunction of the valve body

L: Refer to the Transmission Workshop Manual.

INVECS-II CANCEL COMMAND

DUse the MUT-II to stop the

INVECS-II function.

Does standard shifting occur normally? No Does the problem occur only when the

automatictransmissionfluidtemperature

is -29_C or lower or 125_C or higher?

No Valve body disassembly, cleaning and

reassembly L

DPay particular attention to loosening

of bolts, and to damage and slippage

of O-rings, valves and valve bodies.

DIf the damage cannot be repaired,

replace the valve body assembly.

Yes

It is related to control and is not an ab-

normality.

Yes

INSPECTION PROCEDURE 13

No diagnosis codes (Does not shift) Probable cause

If shifting does not occur while driving and no diagnosis codes are output, the cause

is probably a malfunction of the inhibitor switch, or A/T-ECU.

DMalfunction of the inhibitor switch

DMalfunction of the A/T-ECU

Does the transmission remain in 3rd

gear with selector lever in position

No MUT-II Data list

DNo. 61 Inhibitor switch

OK: A/T-ECU input signal and se-

lector lever position should

match.

NG Inhibitor switch check

DINSPECTION PROCEDURE 16 -

Inhibitor switch system check.

(Refer to P.23-36.)

Yes

Is backup power being supplied to the

A/T-ECU?

No Yes

Is power being supplied to the

A/T-ECU?

Yes

Power supply circuit check

DPay particular attention to open

circuits in the harnesses, poor

connector connections and open

circuits in fuses.

DIf there is a blown fuse, investigate

why a short-circuit has occurred and

then replace the fuse.

Replace the A/T-ECU.

MUT-II Data list

DNo. 62 Hold mode signal

OK: The signal should change

when the mode control switch

position is changed.

NG Mode control switch check

DINSPECTION PROCEDURE 17 -

Mode control switch system check

(Refer to P.23-36.)

AUTOMATIC TRANSMISSION - Troubleshooting 23-35

INSPECTION PROCEDURE 14

Poor acceleration Probable cause

If acceleration is poor even if downshifting occurs while driving, the cause is probably

a malfunction of the engine system or of a brake or clutch.

DMalfunction of the engine system

DMalfunction of the brake or clutch

L: Refer to the Transmission Workshop Manual.

Engine system check

DCheck the control system, ignition system, fuel system and

main system.

NG Replace, repair

Brake or clutch check L

DCheck for burning of the facing, defective piston seal rings

and interference at the retainer.

INSPECTION PROCEDURE 15

Vibration Probable cause

If vibration occurs when driving at constant speed or when accelerating and deceleration

in top range, the cause is probably abnormal damper clutch pressure or a malfunction

of the engine system, damper clutch control solenoid valve, torque converter or valve

body.

DAbnormal damper clutch pressure

DMalfunction of the engine system

DMalfunction of the damper clutch control solenoid valve

DMalfunction of the torque converter

DMalfunction of the valve body

L: Refer to the Transmission Workshop Manual.

MUT-II Actuator test

DNo. 6 Damper clutch control solenoid valve

OK: Sound of operation can be heard.

Replace the damper clutch control solenoid valve. L

Does the problem occur even when the oil temperature sensor

connector is disconnected?

Yes Engine system check

DCheck the control system, ignition system, fuel system and

main system.

Hydraulic pressure test (Refer to P.23-56.)

DMeasure the damper clutch pressure.

Standard value: Refer to P.23-57.

NG Valve body disassembly, cleaning and reassembly L

DPay particular attention to loosening of bolts, and to damage

and slippage of O-rings, valves and valve bodies.

DIf the damage cannot be repaired, replace the valve body

assembly.

Replace the torque converter assembly.

AUTOMATIC TRANSMISSION - Troubleshooting

23-36

INSPECTION PROCEDURE 16

Inhibitor switch system Probable cause

The cause is probably a malfunction of the inhibitor switch circuit, ignition switch

circuit or a defective A/T-ECU.

DMalfunction of the inhibitor switch

DMalfunction of the ignition switch

DMalfunction of connector

DMalfunction of the A/T-ECU

Inhibitor switch check (Refer to P.23-49.) NG Replace

Check the voltage of the inhibitor switch

connector B-72.

DDisconnect the connector and

measure at the harness side.

DVoltage between terminal No. 8 and

earth

OK: Battery voltage

NG Check the following connectors:

C-49, C-83, C-131, C-134

NG Repair

Harness check

DBetween inhibitor switch and

ignition switch

NG Repair

Check the trouble symptoms.

Ignition switch check

(Refer to GROUP54 - Ignition Switch.)

Check the following connectors:

B-72, C-30, C-47, C-48

NG Repair

Harness check

DBetween inhibitor switch and

A/T-ECU connector

NG Repair

Check the trouble symptoms. NG Repalce the A/T-ECU.

INSPECTION PROCEDURE 17

Mode control switch system Probable cause

The cause is probably a defective mode control switch circuit or a defective A/T-ECU. DMalfunction of the mode control switch

DMalfunction of connector

DMalfunction of the A/T-ECU

Check the following the connector:

C-30

Check the trouble symptoms. NG Replace the A/T-ECU.

NG Repair

Ignition switch check (Refer to GROUP

54 - Ignition Switch.)

Check the trouble symptoms.

Harness check

DBetween mode control switch and

ignition switch

Harness check.

DBetween mode control switch and

A/T-ECU

Check the voltage of the A/T-ECU con-

nector C-30.

DDisconnect the connector and check

at the harness side.

DIgnition switch: ON

DSelect the HOLD mode.

DVoltage between terminal No. 70 and

earth

OK: Battery voltage

NG Check the following connectors:

C-49, C-83, C-89, C-131, C-134

NG Repair

Mode control switch check

(Refer to P.23A-65.)

NG Replace

AUTOMATIC TRANSMISSION - Troubleshooting 23-37

INSPECTION PROCEDURE 18

Idle position switch system Probable cause

The cause is probably a defective idle position switch circuit or a defective A/T-ECU. DMalfunction of the idle position switch

DMalfunction of connector

DMalfunction of the A/T-ECU

Idle position switch check

(Refer to GROUP 13A -On-vehicle Service.)

Replace the throttle position sensor.

Check the following connectors:

B-07 <Vehicles without TCL>, B-41 <Vehicles with TCL>, C-29

NG Repair

Harness check

DBetween idle position switch and A/T-ECU

NG Repair

Check the trouble symptoms.

NG Replace the A/T-ECU.

INSPECTION PROCEDURE 19

Dual pressure switch system Probable cause

The cause is probably a defective dual pressure switch circuit or a defective A/T-ECU. DMalfunction of the dual pressure switch

DMalfunction of connector

DMalfunction of A/C system

DMalfunction of the A/T-ECU

Dual pressure switch check (Refer to

GROUP 55 - On-vehicle service.)

NG Replace

Check the voltage of the A/T-ECU con-

nector C-28.

DDisconnect the connector and

check at the harness side.

DIgnition switch: ON

DA/C switch: ON

DVoltage between terminal No. 10

and earth

OK: Battery voltage

OK Check the following connectors:

B-30, C-28

NG Repair

Check the trouble symptoms.

Check the A/C system. (Refer to

GROUP 55 - Troubleshooting.)

Repair

Replace the A/T-ECU.

A/C system check (Refer to GROUP

55 - Troubleshooting.)

AUTOMATIC TRANSMISSION - Troubleshooting

23-38

INSPECTION PROCEDURE 20

Vehicle speed sensor system Probable cause

The cause is probably a defective vehicle speed sensor circuit or a defective A/T-ECU. DMalfunction of the vehicle speed sensor

DMalfunction of connector

DMalfunction of the A/T-ECU

2. NG

3. NG

Check the ignition switch. (Refer to GROUP 54 - Ignition switch.)

Replace the engine-ECU.

Check the harness wire between the vehicle speed sensor and

the earth, and repair if necessary.

Check the harness wire

between the engine-ECU

and the vehicle speed

sensor connector.

NG Repair

Check trouble symptom.

Check the following

connectors:

C-30, C-48

NG Repair

Check the harness wire

between the vehicle

speed sensor and ignition

switch connector.

NG Repair

Check trouble symptom.

Check the harness wire

between the engine-ECU

and the vehicle speed

sensor connector.

NG Repair

Check trouble symptom.

Check the following

connector:

B-67

NG Repair

Measure at the vehicle speed sensor connector B-67.

DDisconnect the connector, and measure at the harness side.

1. Voltage between 1 and earth (Ignition switch: ON)

OK: Battery voltage

2. Voltage between 3 and earth (Ignition switch: ON)

OK: 4.8 - 5.2 V

3. Continuity between 2 and earth

OK: Continuity

1. NG Check the following

connectors:

C-90, C-131, C-135

NG Repair

Check the vehicle speed sensor.

(Refer to GROUP 54 - Combination Meters.)

NG Replace

INSPECTION PROCEDURE 21

Auto-cruise-ECU signal system Probable cause

The cause is probably a defective auto-cruise signal line circuit or a defective A/T-ECU. DMalfunction of connector

DMalfunction of the A/T-ECU

DMalfunction of the auto-cruise-ECU

Auto-cruise system check (Refer to GROUP 17 - Troubleshooting.) NG Repair

Check the following connectors: C-28, C-82, C-83 NG Repair

Harness check

DBetween auto-cruise-ECU and A/T-ECU

OK Replace the A/T-ECU.

Repair

AUTOMATIC TRANSMISSION - Troubleshooting 23-39

DATA LIST REFERENCE TABLE 23100810208

Item No. Check item Check requirement Normal value

11 Throttle position sensor

Engine: Stopped

Selector lever

Accelerator pedal:

Released

400 - 1,000 mV

Accelerator pedal

position sensor

position: P Accelerator pedal:

Halfly depressed

Gradually rises from the

above value

Accelerator pedal:

Depressed

4,500 - 5,000 mV

15 Oil temperature sensor Warming up Drive for 15 minutes or

more so that the

automatic transmission

fluid temperature

becomes 70 - 90 _C.

Gradually rises to

70 - 90 _C

21 Crank angle sensor Engine: Idling

Selector lever

Accelerator pedal:

Released

550 - 900 rpm

position: P Accelerator pedal:

Halfly depressed

Gradually rises from the

above value

22 Input shaft speed

sensor

Selector lever

position: 3

Driving at constant speed

of 50 km/h in 3rd gear

1,800 - 2,100 rpm

23 Output shaft speed

sensor

Selector lever

position: 3

Driving at constant speed

of 50 km/h in 3rd gear

1,800 - 2,100 rpm

25 Wide open throttle Accelerator pedal Released OFF

switch position

Depressed ON

26 Stop lamp switch Ignition switch: ON Brake pedal: Depressed ON

Engine: Stopped Brake pedal: Released OFF

29 Vehicle speed sensor Selector lever

position: 3

Idling with 1st gear

(Vehicle stopped)

0 km/h

Driving at constant speed

of 50 km/h in 3rd gear

50 km/h

31 Low and reverse

solenoid valve duty %

Selector lever

position: L, 2, 3, D

10 km/h in 1st gear No. 31: 0 %, No. 32: 0

%, No. 33: 100 %,

No. 34: 100%

32 Underdrive solenoid

valve duty %

30 km/h in 2nd gear No. 31: 100 %, No. 32:

0 %, No. 33: 0 %,

No. 34: 100%

33 Second solenoid valve

duty %

50 km/h in 3rd gear No. 31: 100 %, No. 32:

0 %, No. 33: 100 %,

No. 34: 0%

34 Overdrive solenoid valve

duty %

70 km/h in 4th gear No. 31: 100 %, No. 32:

100 %, No. 33: 0 %,

No. 34: 0%

AUTOMATIC TRANSMISSION - Troubleshooting

23-40

Item No. Normal valueCheck requirementCheck item

36 Damper clutch control

solenoid valve duty %

Selector lever

position: 3

Driving at 50 km/h in

3rd gear with accelerator

released

Driving at constant speed

of 70 km/h in 3rd gear

Approx. 70 - 90 %

52 Amount of damper

clutch slippage

Selector lever

position: 3

Driving at 50 km/h in 3rd

gear with accelerator

fully closed

Approx. 100 - 300 rpm*

Driving at constant speed

of 70 km/h in 3rd gear

Approx. 0 - 10 rpm

54 Control relay output

voltage

Ignition switch : OFF Ignition switch:

ON ®OFF

Battery voltage (mV) ®

0mV

57 Engine volumetric

efficiency

Selector lever

position: N

N range with accelerator

pedal released ®

depressed.

Data changes

61 Inhibitor switch Ignition switch: ON Selector lever position: P P

Engine: Stopped Selector lever position: R R

Selector lever position: N N

Selector lever position: D D

Selector lever position: 3 3

Selector lever position: 2 2

Selector lever position: L L

62 HOLD mode signal Mode control switch HOLD ON

position

AUTO OFF

63 Shift position Selector lever posi-

tion: L, 2, 3, D

Driving at constant speed

of 10 km/h in 1st gear

1st

Driving at constant speed

of 30 km/h in 2nd gear

2nd

Driving at constant speed

of 50 km/h in 3rd gear

3rd

Driving at constant speed

of 70 km/h in 4th gear

4th

64 Idle position switch Engine: Idling

Selector lever posi-

Accelerator pedal:

Released

tion: N

Accelerator pedal:

Halfly depressed

OFF

65 Dual pressure switch Engine: Idling A/C switch: ON ON

Selector lever posi-

tion: N A/C switch: OFF OFF

AUTOMATIC TRANSMISSION - Troubleshooting 23-41

Item No. Normal valueCheck requirementCheck item

66 Auto-cruse-ECU signal While auto-cruise Plain road OFF

operating

Sloping road ON

NOTE

*: The damper clutch is released when the accelerator is fully closed (Idle position switch: ON).

ACTUATOR TEST JUDGEMENT VALUE 23100820065

Item No. Check item Test content Check requirement Normal value

1Low reverse solenoid valve Drive the solenoid Ignition switch: ON The operation sound should

2Underdrive solenoid valve

valve specified by

the MUT-II at 50 % Selector lever

position: P

be audible when the solenoid

valve is driven.

3Second solenoid valve

duty for 5 seconds.

No other solenoid Engine: 0 r/min

Vehicle speed:

4Overdrive solenoid valve valve should be

energised.

Vehicle speed:

0 km/h

6Damper clutch control

solenoid valve

(Vehicle stopped)

Throttle

(Accelerator)

12 A/T control relay Control relay is OFF

for 3 seconds.

opening voltage:

Less than 0 V

Idle switch: ON

Data list No. 54

(1) During test: 0 mV

(2) Normal: Battery voltage

[mV]

INVECS-II CANCEL COMMAND 23100950023

Item No. Item Content Remarks

14 INVECS-II Stop the INVECS-II control and change gears

according to the standard shift pattern.

Use this function when carrying

out procedure 8 in the road

tests.

AUTOMATIC TRANSMISSION - Troubleshooting

23-42

CHECK AT A/T-ECU TERMINALS 23100840207

Terminal

No.

Check item Check requirement Standard value

1Underdrive solenoid valve Selector lever position: D (1st gear) Battery voltage

Selector lever position: P Approx.7 - 9 V

2Solenoid valve power supply Ignition switch: OFF 0V

Ignition switch: ON Battery voltage

3Solenoid valve power supply Ignition switch: OFF 0V

Ignition switch: ON Battery voltage

8Auto-cruse control unit No OD-OFF request Battery voltage

OD-OFF request 0V

10 A/C compressor load signal A/C switch: OFF 0V

A/C switch: ON Battery voltage

11 Power supply Ignition switch: OFF 0V

Ignition switch: ON Battery voltage

12 Earth Always 0V

13 Earth Always 0V

14 Overdrive solenoid valve Selector lever position: D (3rd gear) Battery voltage

Selector lever position: P Approx. 7 - 9 V

15 Damper clutch control solenoid Selector lever position: L (1st gear) Battery voltage

valve

Selector lever position: 3 (50 km/h in 3rd gear) Other than

battery voltage

16 Second solenoid valve Selector lever position: 2 (2nd gear) Battery voltage

Selector lever position: P Approx. 7 - 9 V

21 Engine-ECU torque reduction

request signal

Ignition switch: ON (except during shifting) 4-5V

AUTOMATIC TRANSMISSION - Troubleshooting 23-43

Terminal

No.

Standard valueCheck requirementCheck item

23 Diagnosis control - -

24 Power supply Ignition switch: OFF 0V

Ignition switch: ON Battery voltage

25 Earth Always 0V

26 Earth Always 0V

31 Input shaft speed sensor Measure between terminal No. 31 and No. 43 by

an oscilloscope.

Engine: 2,000 r/min

Selector lever position: 3

Refer to P.23-45,

Oscilloscope

inspection

procedure.

32 Output shaft speed sensor Measure between terminal No. 32 and No. 43 by

an oscilloscope.

Engine: 2,000 r/min

Selector lever position: 3

Refer to P.23-45,

Oscilloscope

inspection

procedure.

33 Crank angle sensor Engine: Idling 2.0 - 2.4 V

36 Idle position switch Engine: Idling 0V

Engine: Other than idling 5V

38 Back up power suuply Ignition switch: OFF Battery voltage

43 Sensor earth Always 0V

44 Oil temperature sensor ATF temperature: 25 _C3.8 - 4.0 V

ATF temperature: 80 _C2.3 - 2.5 V

45 Throttle position sensor (TPS)

Accelerator pedal: Released (Engine stopped) 0.5 - 1.0 V

Accelerator pedal position sensor

(APS) <Vehicles with TCL> Accelerator pedal: Depressed (Engine stopped) 4.5 - 5.0 V

53 Communication with engine-ECU

Communication with TCL-ECU

Engine: Idling

Selector lever position: D

Other than 0 V

54 Communication with engine-ECU

Communication with TCL-ECU

Engine: Idling

Selector lever position: D

Other than 0 V

55 Inhibitor switch P Selector lever position: P Battery voltage

Selector lever position: Other than above 0V

56 Inhibitor switch N Selector lever position: N Battery voltage

Selector lever position: Other than above 0V

57 Inhibitor switch 3 Selector lever position: 3 Battery voltage

Selector lever position: Other than above 0V

AUTOMATIC TRANSMISSION - Troubleshooting

23-44

Terminal

No.

Standard valueCheck requirementCheck item

58 Inhibitor switch L Selector lever position: L Battery voltage

Selector lever position: Other than above 0V

59 Stop lamp switch Brake pedal: Depressed Battery voltage

Brake pedal: Released 0V

62 Low and reverse solenoid valve Selector lever position: D (1st gear) Battery voltage

Selector lever position: D (2nd gear) Approx. 7 - 9 V

63 Diagnosis output Normal (No diagnosis code output) 0®5 V flashing

65 Wide open throttle switch Accelerator pedal: Released 4.5 - 5.5 V

Accelerator pedal: Depressed Less than 0.4 V

66 Inhibitor switch R Selector lever position: R Battery voltage

Selector lever position: Other than above 0V

67 Inhibitor switch D Selector lever position: D Battery voltage

Selector lever position: Other than above 0V

68 Inhibitor switch 2 Selector lever position: 2 Battery voltage

Selector lever position: Other than above 0V

69 Vehicle speed sensor When stopped 0V

Move forward slowly 0®5 V flashing

70 Mode control switch Select HOLD mode Battery voltage

Select AUTO mode 0V

71 A/T control relay Ignition switch: OFF 0V

Ignition switch: ON Battery voltage

72 Earth Ignition switch: ON 0V

AUTOMATIC TRANSMISSION - Troubleshooting 23-45

OSCILLOSCOPE INSPECTION PROCEDURE 23100850064

Check item Check requirement Normal condition

(Waveform sample)

Crank angle sensor Selector lever position: N Idling (Vehicle stopped) Waveform A

Input shaft speed

sensor

Selector lever position: 3 Driving at constant speed of 50

km/h in 3rd gear

Waveform B

Output shaft

speed sensor

(Engine: 1,800 - 2,100 r/min)

Vehicle speed sensor

Low reverse

solenoid valve

Ignition switch: ON

Selector lever position: P

Force drive each solenoid valve

(Actuator test)

Waveform C

Underdrive solenoid

valve

Engine: 0 r/min

Vehicle speed: 0 km/h

(Vehicle stopped)

Second solenoid

valve

(Vehicle stopped)

Throttle (Accelerator) opening

angle: Less than 1 V

Overdrive solenoid

valve

Idle switch: ON

Damper clutch

control solenoid

valve

Waveform sample

Waveform A

(ms)

(V)

Waveform B

(ms)

(V)

Waveform C

(ms)

(V)

AUTOMATIC TRANSMISSION - On-vehicle Service

23-46

ON-VEHICLE SERVICE 23100090237

ESSENTIAL SERVICE

AUTOMATIC TRANSMISSION FLUID CHECK

1. Drive the vehicle until the fluid temperature rises to the

normal temperature (70 - 80_C).

2. Park the vehicle on a level surface.

3. Move the selector lever through all positions to fill the

torque converter and the hydraulic circuits with fluid, and

then move the selector lever to the N position.

4. After wiping off any dirt around the oil level gauge, remove

the oil level gauge and check the condition of the fluid.

NOTE

If the fluid smells as if it is burning, it means that the

fluid has been contaminated by the particles from the

bushes and friction materials, a transmission overhaul

and flushing the cooler line may be necessary.

5. Check that the fluid level is at the HOT mark on the

oil level gauge. If the fluid level is lower than this, pour

in more fluid until the level reaches the HOT mark.

Automatic transmission fluid:

Dia Queen ATF SP II or equivalent

NOTE

If the fluid level is low, the oil pump will draw in air along

with the fluid, which will cause bubbles to form inside

the hydraulic circuit. This will in turn cause the hydraulic

pressure to drop, which will result in late shifting and

slipping of the clutches and brakes.

If there is too much fluid, the gears can churn it up into

foam and cause the same conditions that can occur with

low fluid levels.

In either case, air bubbles can cause overheating and

oxidation of the fluid which can interfere with normal valve,

clutch, and brake operation. Foaming can also result in

fluid escaping from the transmission vent, in which case

it may be mistaken for a leak.

6. Securely insert the oil level gauge.

7. The fluid and oil filters should always be replaced in the

following conditions:

When troubleshooting the transmission

When overhauling the transmission

When the oil is noticeably dirty or deteriorates (driving

under the severe condition)

Furthermore, the oil filters are special filters which are

only to be used for the automatic transmission.

AUTOMATIC TRANSMISSION - On-vehicle Service 23-47

AUTOMATIC TRANSMISSION FLUID REPLACEMENT

23100100251

If you have a fluid changer, use this changer to replace the

fluid. If you do not have a fluid changer, replace the fluid

by the following procedure.

1. Disconnect the hose shown in the illustration which

connects the transmission and the oil cooler (inside the

radiator).

2. Start the engine and let the fluid drain out.

Running conditions: N range with engine idling

Caution

The engine should be stopped within one minute after

it is started. If the fluid has all drained out before

then, the engine should be stopped at that point.

Discharge volume: Approx. 3.5 L

3. Remove the drain plug from the bottom of the transmission

case to drain the fluid.

Discharge volume: Approx. 2.0 L

4. Replace the oil filters. (Refer to P.23-48.)

5. Install the drain plug via a new gasket, and tighten it

to the specified torque.

Tightening torque: 32 Nm

6. Pour the new fluid in through the oil filler tube.

Adding volume: Approx. 5.5 L

Caution

Stop pouring if the full volume of fluid cannot be

poured in.

7. Repeat the procedure in step 2.

NOTE

Drain the fluid from the cooler hose 7 L at least. Then

drain the fluid a little and check the fluid for dirt.

If it has been contaminated, repeat the steps 6 and 7.

8. Pour the new fluid in through the oil filler tube.

Adding volume: Approx. 3.5 L

AUTOMATIC TRANSMISSION - On-vehicle Service

23-48

9. Reconnect the hose which was disconnected in step 1

above, and firmly replace the oil level gauge.

10. Start the engine and run it at idle for 1 - 2 minutes.

11. Move the selector lever through all positions, and then

move it to the N position.

12. Check that the fluid level is at the COLD mark on the

oil level gauge. If the level is lower than this, pour in

more fluid.

13. Drive the vehicle until the fluid temperature rises to the

normal temperature (70 - 80_C), and then check the

fluid level again.

The fluid level must be at the HOT mark.

NOTE

The COLD level is for reference only; the HOT level should

be regarded as the standard level.

14. Firmly insert the oil level gauge into the oil filler tube.

OIL FILTER REPLACEMENT 23101050067

1. Use the special tool (MB991610) to remove the automatic

transmission oil filter.

2. Clean the filter bracket side mounting surface.

3. Apply a small amount of automatic transmission fluid to

the O-ring of the new oil filter.

4. Use the special tool (MB991610) to install the automatic

transmission oil filter.

NOTE

Tightening torque: 12 Nm

5. Check the quantity of the automatic transmission fluid.

(Refer to P.23-46.)

THROTTLE POSITION SENSOR ADJUSTMENT

<Vehicles without TCL> 23100190142

Refer to GROUP 13A - On-vehicle Service.

ACCELERATOR PEDAL POSITION SENSOR

ADJUSTMENT <Vehicles with TCL> 23100250048

Refer to GROUP 13A - On-vehicle Service.

Apply ATF

to O-ring

AUTOMATIC TRANSMISSION - On-vehicle Service 23-49

INHIBITOR SWITCH CONTINUITY CHECK 23100140345

Items Terminal No.

12345678910

INHIBITOR SWITCH AND CONTROL CABLE

ADJUSTMENT 23100150096

1. Set the selector lever to the “N” position.

2. Loosen the control cable to manual control lever coupling

nut to free the cable and lever.

3. Set the manual control lever to the neutral position.

Inhibitor switch

Transmission

control cable

Adjusting nut

Manual

control

lever

AUTOMATIC TRANSMISSION - On-vehicle Service

23-50

4. Loosen the inhibitor switch body mounting bolts and the

turn the inhibitor switch body so the hole in the end of

the manual control lever and the hole (cross section A-A

in the figure on the left) in the flange of the inhibitor

switch body flange are aligned.

5. Tighten the inhibitor switch body mounting bolts to the

specified torque. Be careful at this time that the position

of the switch body is not changed.

6. Gently pull the transmission control cable in the direction

of the arrow, and then tighten the adjusting nut.

7. Check that the selector lever is in the “N” position.

8. Check that each range on the transmission side operates

and functions correctly for each position of the selector

lever.

10 - 12 Nm

Mounting bolts

Manual

control lever

Section A-A

Hole in end

Hole in

flange

Manual control

lever

Inhibitor

switch body

Adjusting nut

12 Nm

Manual control lever

AUTOMATIC TRANSMISSION - On-vehicle Service 23-51

A/T CONTROL COMPONENT LOCATION 23100860234

Name Symbol Name Symbol

Accelerator position sensor (with idle position

switch) <Vehicles with TCL>

CMode control switch L

A/T control relay MOil temperature sensor G

A/T-ECU KOutput shaft speed sensor E

Crank angle sensor BShift indicator lamp I

Diagnosis connector OSolenoid valve G

Dual pressure switch AStop lamp switch P

Engine ECU KTCL-ECU J

Inhibitor switch FThrottle position sensor (with idle position

switch) <Vehicles without TCL>

Input shaft speed sensor HVehicle speed sensor D

Wide open throttle switch N

C D

AUTOMATIC TRANSMISSION - On-vehicle Service

23-52

A/T CONTROL COMPONENT CHECK 23100900011

CRANK ANGLE SENSOR CHECK

Refer to GROUP 13A - Troubleshooting.

THROTTLE POSITION SENSOR CHECK

<Vehicles without TCL> 23100390030

Refer to GROUP 13A - On-vehicle Service.

ACCELERATOR PEDAL POSITION SENSOR CHECK

<Vehicles with TCL> 23100420029

Refer to GROUP 13H - On-vehicle Service.

OIL TEMPERATURE SENSOR CHECK 23100450035

1. Remove the oil temperature sensor.

2. Measure the resistance between terminals No. 1 and

No. 2 of the oil temperature sensor connector.

Standard value:

Oil temperature (_C) Resistance (kW)

016.7- 20.5

100 0.57- 0.69

INHIBITOR SWITCH CHECK 23100140352

Refer to P.23A-49.

STOP LAMP SWITCH CHECK 23100910014

Refer to GROUP 35 - Brake Pedal.

VEHICLE SPEED SENSOR CHECK 23100460038

Refer to GROUP 54 - On-vehicle Service.

Oil temperature sensor

ATF

AUTOMATIC TRANSMISSION - On-vehicle Service 23-53

DUAL POSITION PRESSURE SWITCH CHECK

23100470031

Refer to GROUP 55 - On-vehicle Service.

IDLE POSITION SWITCH CHECK 23100410033

Refer to GROUP 13A - On-vehicle Service.

MODE CONTROL SWITCH CHECK 23100920048

Refer to P.23-65.

WIDE OPEN THROTTLE SWITCH CHECK 23100890080

Refer to P.23-64.

A/T CONTROL RELAY CHECK 23100930065

1. Remove the A/T control relay.

2. Use jumper wires to connect A/T control relay terminal

2 to the battery (- ) terminal and terminal 4 to the battery

(+) terminal.

3. Check the continuity between terminal 1 and terminal

3 of the A/T control relay when the jumper wires are

connected to and disconnected from the battery.

Jumper wire Continuity between terminals No. 1

and No. 3

Connected Continuity

Disconnected No continuity

4. If there is a problem, replace the A/T control relay.

AUTOMATIC TRANSMISSION - On-vehicle Service

23-54

SOLENOID VALVE CHECK 23100940013

1. Remove the valve body cover.

2. Disconnect the connectors of each solenoid valve.

3. Measure the resistance between terminals 1 and 2 of

each solenoid valve.

Standard value:

Name Resistance

Damper clutch solenoid valve 2.7 - 3.4 W

Low and reverse solenoid valve (at 20_C)

Second solenoid valve

Underdrive solenoid valve

Overdrive solenoid valve

4. If the resistance is outside the standard value, replace

the solenoid valve.

TORQUE CONVERTER STALL TEST 23100540206

This test measures the maximum engine speed when the

selector lever is at the D or R position and the torque converter

stalls to test the operation of the torque converter, starter

motor and one-way clutch operation and the holding

performance of the clutches and brakes in the transmission.

Caution

Do not let anybody stand in front of or behind the vehicle

while this test is being carried out.

1. Check the automatic transmission fluid level and

temperature and the engine coolant temperature.

DFluid level: At the HOT mark on the oil level gauge

DFluid temperature: 80 - 100_C

DEngine coolant temperature: 80 - 100_C

Overdrive

solenoid

valve

Low and

reverse

solenoid

valve

Second

solenoid

valve

Damper

clutch

solenoid

valve

Underdrive

solenoid

valve

Reverse

clutch Low-reverse

brake

Underdrive

clutch

Torque

converter

AUTOMATIC TRANSMISSION - On-vehicle Service 23-55

2. Check both rear wheels (left and right).

3. Pull the parking brake lever on, with the brake pedal

fully depressed.

4. Start the engine.

5. Move the selector lever to the D position, fully depress

the accelerator pedal and take a reading of the maximum

engine speed at this time.

Caution

1. The throttle should not be left fully open for any

more than eight seconds.

2. If carrying out the stall test two or more times,

move the selector lever to the N position and run

the engine at 1,000 r/min to let the automatic

transmission fluid cool down before carrying out

subsequent tests.

Standard value

Stall speed: 2,100 - 2,600 r/min

6. Move the selector lever to the R position and carry out

the same test again.

Standard value

Stall speed: 2,100 - 2,600 r/min

TORQUE CONVERTER STALL TEST JUDGEMENT

RESULTS

a. Stall speed is too high in both D and R ranges

DLow line pressure

DLow & reverse brake slippage

b. Stall speed is too high in D range only

DUnderdrive clutch slippage

c. Stall speed is too high in R range only

DReverse clutch slippage

d. Stall speed too low in both D and R ranges

DMalfunction of torque converter

DInsufficient engine output

AUTOMATIC TRANSMISSION - On-vehicle Service

23-56

HYDRAULIC PRESSURE TEST 23100550216

1. Warm up the engine until the automatic transmission fluid

temperature is 80 - 100_C.

2. Jack up the vehicle so that the wheels are free to turn.

3. Connect the special tools (2,942 kPa oil pressure gauge

[MD998330] and joints [MD998332, MD998900]) to each

pressure discharge port.

4. Measure the hydraulic pressure at each port under the

conditions given in the standard hydraulic pressure table,

and check that the measured values are within the

standard value ranges.

5. If a value is outside the standard range, correct the

problem while referring to the hydraulic pressure test

diagnosis table.

AUTOMATIC TRANSMISSION - On-vehicle Service 23-57

STANDARD HYDRAULIC PRESSURE TEST

<4G63>

Measurement condition Standard hydraulic pressure kPa

Selector

lever

position

Shift posi-

tion

Engine

speed

(r/min)

Under-

drive

clutch

pressure

Reverse

clutch

pressure

Overdrive

clutch

pressure

Low and

reverse

brake

pressure

Second

brake

pressure

Torque

converter

pressure

P - 2,500 - - - 310 - 390 -310 - 390

RReverse 2,500 -1,320 -

1,720

-1,320 -

1,720

-500 - 700

N - 2,500 - - - 310 - 390 -310 - 390

D1st gear 2,500 1,010 -

1,050

- - 1,010 -

1,050

-500 - 700

2nd gear 2,500 1,010 -

1,050

- - - 1,010 -

1,050

500 - 700

3rd gear 2,500 590 - 690 -590 - 690 - - 450 - 650

4th gear 2,500 - - 590 - 690 -590 - 690 450 - 650

<6A13>

Measurement condition Standard hydraulic pressure kPa

Selector

lever

position

Shift posi-

tion

Engine

speed

(r/min)

Under-

drive

clutch

pressure

Reverse

clutch

pressure

Overdrive

clutch

pressure

Low and

reverse

brake

pressure

Second

brake

pressure

Torque

converter

pressure

P - 2,500 - - - 260 - 340 -260 - 340

RReverse 2,500 -1,320 -

1,720

-1,320 -

1,720

-500 - 700

N - 2,500 - - - 260 - 340 -260 - 340

D1st gear 2,500 1,010 -

1,050

- - 1,010 -

1,050

-500 - 700

2nd gear 2,500 1,010 -

1,050

- - - 1,010 -

1,050

500 - 700

3rd gear 2,500 780 - 880 -780 - 880 - - 450 - 650

4th gear 2,500 - - 780 - 880 -780 - 880 450 - 650

AUTOMATIC TRANSMISSION - On-vehicle Service

23-58

HYDRAULIC PRESSURE TEST DIAGNOSIS TABLE

Trouble symptom Probable cause

All hydraulic pressures are high. Incorrect transmission control cable adjustment

Malfunction of the regulator valve

All hydraulic pressures are low. Incorrect transmission control cable adjustment

Malfunction of the oil pump

Clogged internal oil filter

Clogged external oil filter

Clogged oil cooler

Malfunction of the regulator valve

Malfunction of the relief valve

Incorrect valve body installation

Hydraulic pressure is abnormal Malfunction of the regulator valve

in “R” range only. Clogged orifice

Incorrect valve body installation

Hydraulic pressure is abnormal Malfunction of the overdrive solenoid valve

in “3” or “4” range only. Malfunction of the overdrive pressure control valve

Malfunction of the regulator valve

Malfunction of the switch valve

Clogged orifice

Incorrect valve body installation

Only underdrive hydraulic Malfunction of the oil seal K

pressure is abnormal. Malfunction of the oil seal L

Malfunction of the oil seal M

Malfunction of the underdrive solenoid valve

Malfunction of the underdrive pressure control valve

Malfunction of check ball

Clogged orifice

Incorrect valve body installation

Only reverse clutch hydraulic Malfunction of the oil seal A

pressure is abnormal. Malfunction of the oil seal B

Malfunction of the oil seal C

Clogged orifice

Incorrect valve body installation

AUTOMATIC TRANSMISSION - On-vehicle Service 23-59

Trouble symptom Probable cause

Only overdrive hydraulic Malfunction of the oil seal D

pressure is abnormal. Malfunction of the oil seal E

Malfunction of the oil seal F

Malfunction of the overdrive solenoid valve

Malfunction of the overdrive pressure control valve

Malfunction check ball

Clogged orifice

Incorrect valve body installation

Only low and reverse hydraulic Malfunction of the oil seal I

pressure is abnormal. Malfunction of the oil seal J

Malfunction of the low and reverse solenoid valve

Malfunction of the low and reverse pressure control valve

Malfunction of the switch valve

Malfunction of the fail safe valve A

Malfunction of check ball

Clogged orifice

Incorrect valve body installation

Only second hydraulic pressure Malfunction of the oil seal G

is abnormal. Malfunction of the oil seal H

Malfunction of the oil seal O

Malfunction of the second solenoid valve

Malfunction of the second pressure control valve

Malfunction of the fail safe valve B

Clogged orifice

Incorrect valve body installation

Only torque converter pressure Malfunction of the oil cooler

is abnormal. Malfunction of the oil seal N

Malfunction of the damper clutch control solenoid valve

Malfunction of the damper clutch control valve

Malfunction of the torque converter pressure control valve

Clogged orifice

Incorrect valve body installation

Pressure applied to non Incorrect transmission control cable adjustment

operating element. Malfunction of the manual valve

Malfunction of check ball

Incorrect valve body installation

AUTOMATIC TRANSMISSION - On-vehicle Service

23-60

OIL SEAL LAYOUT

EFGIJKLMN

AUTOMATIC TRANSMISSION - On-vehicle Service 23-61

HYDRAULIC CIRCUIT 23100880070

PARKING AND NEUTRAL

12 3 4 5

910

14 15 16 17 18

19 20 21 22 23

24 25 26

28 29

666

RND

1. Reverse clutch

2. Low-reverse brake

3. Second brake

4. Underdrive clutch

5. Overdrive clutch

6. Accumulator

7. Check ball

8. Damper clutch

9. Fail safe valve A

10. Fail safe valve B

11. Damper clutch control valve

12. Switch valve

13. Automatic transmission fluid cooler

14. Lubrication

15. Low-reverse pressure control valve

16. Second pressure control valve

17. Underdrive pressure control valve

18. Overdrive pressure control valve

19. Damper clutch control solenoid

valve

20. Low-reverse solenoid valve

21. Second solenoid valve

22. Underdrive solenoid valve

23. Overdrive solenoid valve

24. Torque converter pressure control

valve

25. Regulator valve

26. Manual valve

27. Oil filter

28. Oil pump

29. Oil strainer

30. Oil filter (Built in type)

31. Relief valve

32. Oil pan

AUTOMATIC TRANSMISSION - On-vehicle Service

23-62

LINE PRESSURE ADJUSTMENT 23100170122

1. Discharge the automatic transmission fluid, and then

remove the valve body cover.

2. Turn the adjusting screw shown in the illustration at left

to adjust the underdrive pressure to the standard value.

The pressure increases when the screw is turned to the

left.

NOTE

When adjusting the underdrive pressure, adjust to the

middle of the standard value range.

Standard value: 1,010 - 1,050 kPa

Change in pressure for each turn of the adjusting screw:

35 kPa

3. Install the valve body cover, and pour in the standard

volume of automatic transmission fluid.

4. Carry out a hydraulic pressure test. (Refer to P.23-56.)

Readjust the line pressure if necessary.

SELECTOR LEVER OPERATION CHECK

23100130090

1. Shift selector lever to each range and check that lever

moves smoothly and is controlled. Check that position

indicator is correct.

2. Check the selector lever can be moved to each position

(by button operation as shown in the illustration).

3. Start the engine and check if the vehicle moves forward

when the selector lever is moved from N or D, and moves

backward when moved to R.

4. When the shift lever malfunctions, adjust control cable

and selector lever sleeve. Check for worm shift lever

assembly sliding parts.

Adjusting

screw

Push button

Button not pressed

Button pressed

AUTOMATIC TRANSMISSION - Transmission Control 23-63

TRANSMISSION CONTROL 23100660247

REMOVAL AND INSTALLATION

Pre-removal and Post-installation Operation

DAir Cleaner Assembly Removal and Installation

DBattery and Battery Tray Removal and Installation

DLower Cover and Side Cover Removal and

Installation (Refer to GROUP 52A - Instrument

Panel.)

DFloor Console Box Removal and Installation

(Refer to GROUP 52A.)

Caution: SRS

Be careful not to subject the SRS-ECU to any

shocks during removal and installation of the

transmission control cable and selector lever

assembly.

12 Nm

Transmission control cable removal

steps

1. Foot rest <R.H. drive vehicles>

2. Engine-ECU, A/T-ECU and A/T

control relay assembly

"AA3. Nut

4. Adjuster

5. Transmission control cable connec-

tion

6. Transmission control cable assem-

bly

Selector lever assembly removal

steps

5. Transmission control cable connec-

tion

7. Wiring harness connector

8. Selector lever assembly

A/T-ECU removal steps

1. Foot rest <R.H. drive vehicles>

2. Engine-ECU, A/T-ECU and A/T

control relay assembly

Wide open throttle switch removal

step

9. Wide open throttle switch

AUTOMATIC TRANSMISSION - Transmission Control

23-64

INSTALLATION SERVICE POINT

"AANUT INSTALLATION

1. Put the selector lever in the “N” position.

2. Loosen the adjusting nut, gently pull the transmission

control cable in the direction of the arrow and tighten

the nut.

INSPECTION 23100890097

WIDE OPEN THROTTLE SWITCH CHECK

Switch position Terminal No.

1 2

OFF

Manual control lever

Nut

OFF

AUTOMATIC TRANSMISSION - Transmission Control 23-65

SELECTOR LEVER ASSEMBLY 23100680168

DISASSEMBLY AND REASSEMBLY

2Nm

13 Nm

Disassembly steps

1. Push button

2. Spring

3. Bumper

4. Adjuster

5. Shift knob

6. Indicator panel assembly

7. Switch holder

8. A/T mode changeover switch

9. Bolt

10. Shift lever assembly

11. Bushing

12. Detent spring

13. Pipe

14. Position indicator lamp assembly

15. Bracket assembly

INSPECTION 23100670059

A/T MODE CHANGEOVER SWITCH CHECK

Switch position Terminal No.

1243 5

OFF

AUTOMATIC TRANSMISSION - Transmission Assembly

23-66

TRANSMISSION ASSEMBLY 23100570274

REMOVAL AND INSTALLATION

Pre-removal Operation

DCarry out the essential service for the

troubleshooting (Refer to P.23-46.)

DTransmission Fluid Draining (Refer to P.23-47.)

DUnder Cover Removal

DBattery and Battery Tray Removal

DAir Cleaner Assembly Removal

Post-installation Operation

DAir Cleaner Assembly Installation

DBattery and Battery Tray Installation

DUnder Cover Installation

DTransmission Fluid Supplying <Supplying should

be done before starting the engine>

(Refer to P.23-47.)

DCheck the Dust Cover for Cracks or Damage by

Pushing it with Finger.

DSelector Lever Operation Check

DSpeedometer Operation Check

DWheel Alignment Adjustment

(Refer to GROUP 33A - On-vehicle Service.)

88 Nm*1

98 - 118 Nm*1

12 Nm

103 Nm

44 Nm

81 Nm

67 - 78 Nm

24 - 33 Nm

81 Nm

98 - 118 Nm 88 Nm

30 Nm

10 - 12 Nm

13 14

Removal steps

1. Transmission control cable connec-

tion

2. Transmission fluid cooler hoses

connection

3. Bolt

4. Input shaft speed sensor connector

5. Output shaft speed sensor

connector

6. Inhibitor switch connector

7. A/T control solenoid valve assem-

bly connector

8. Vehicle speed sensor connector

9. Starter motor <6A1>

AA"10. Tie rod end connection

11. Stabilizer link connection

12. Damper fork

13. No. 2 stay

14. Lateral lower arm connection

AB"15. No. 3 stay

16. Compression lower arm connection

AC"17. Drive shaft

Caution

*1: Indicates parts which should be temporarily

tightened, and then fully tightened with the

vehicle on the ground in the unladen condition.

AUTOMATIC TRANSMISSION - Transmission Assembly 23-67

7Nm

44 Nm

57 Nm

57 Nm*2

69 Nm

10 Nm <Flange bolts>

9 Nm <Washer assembled bolts>

22 23

93 Nm

49 Nm

30 Nm

69 - 78 Nm

10 - 12 Nm

24 25 Nm

81 Nm*2

49 Nm

45 - 52 Nm

18. Starter motor <4G6>

19. Transmission assembly upper part

coupling bolts

AD"20. Transmission mount bracket

"BA21. Transmission mount stopper

AE"DEngine and transmission assembly

supporting

22. Centermember assembly

23. Rear roll stopper

24. Bell housing cover <4G6>

25. Cover <6A1>

AF"26. Transmission assembly lower part

coupling bolts

AF""

AA27. Transmission assembly

Caution

Mounting locations marked by *2 should be

provisionally tightened, and then fully tightened after

placing the vehicle horizontally and loading the full

weight of the engine on the vehicle body.

AUTOMATIC TRANSMISSION - Transmission Assembly

23-68

REMOVAL SERVICE POINTS

AA"TIE ROD END DISCONNECTION

Caution

1. Use the special tool to loosen the tie rod end mounting

nut. Only loosen the nut; do not remove it from the

ball joint.

2. Support the special tool with a cord, etc. not to let

it come off.

AB"NO.3 STAY REMOVAL

No.3 stay is tightened together with the crossmember.

Therefore, after removing No.3 stay, install the nut and bolt

to the crossmember provisionally.

AC"DRIVE SHAFT DISCONNECTION

1. Insert a pry bar between the transmission case and the

drive shaft as shown to remove the drive shaft.

NOTE

Do not remove the hub and knuckle from the drive shaft.

Caution

Always use a pry bar, or the TJ will be damaged.

2. Suspend the removed drive shaft with a wire so that

there are no sharp bends in any of the joints.

3. Use a shop towel to cover the transmission case not

to let foreign material get into it.

AD"TRANSMISSION MOUNT BRACKET REMOVAL

Jack up the transmission assembly gently with a garage jack,

and then remove the transmission mount bracket.

Cord

Ball joint

MB990635 or

MB991113

Nut

No.3 stay Crossmember

Pry bar

Trans-

mission

side

AUTOMATIC TRANSMISSION - Transmission Assembly 23-69

AE"ENGINE AND TRANSMISSION ASSEMBLY

SUPPORTING

Set the special tool to the vehicle to support the engine and

transmission assembly.

AF"TRANSMISSION ASSEMBLY LOWER PART

COUPLING BOLTS/TRANSMISSION ASSEMBLY

REMOVAL

1. Support the transmission assembly by using a

transmission jack.

2. Remove the drive plate bolts while turning the crank shaft.

3. Press in the torque converter to the transmission side

so that the torque converter does not remain on the engine

side.

4. Remove the transmission assembly lower bolts and lower

the transmission assembly.

INSTALLATION SERVICE POINTS

"AATRANSMISSION ASSEMBLY INSTALLATION

After securely inserting the torque converter into the

transmission side so that the value shown in the illustration

becomes the reference value, install the transmission

assembly to the engine.

Reference value (A): Approx. 12.2 mm

"BATRANSMISSION MOUNT STOPPER

INSTALLATION

Install the transmission mount stopper so that the arrow points

as shown in the illustration.

MZ203827

MB991453

Drive plate bolts

Transmis-

sion mount

stopper

Engine side

Arrow

Transmission

mount bracket

NOTES

Workshop Manual GALANT Mitsubishi Automatic Transmission 23

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