Mitsubishi Outlander GS45X. Manual - part 1689

AUTOMATIC TRANSAXLE DIAGNOSIS <A/T>

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AUTOMATIC TRANSAXLE

23C-61

STEP 2. Check the DTC.
Check that the DTC other than P0729, P0732, P0733, P0734, 
P0735 (6th, 2nd, 3rd, 4th, 5th gear ratio) is set.
Q: Is the DTC set?

YES : Check and repair the relevant DTC system.
NO :  Go to Step 3.

STEP 3. Check the transmission fluid properties.
Check the status of the transmission fluid properties (smell, 
color, fouling).

• Black: A/T inside damage, seizure

• Milky: Water intrusion

Q: Is the check result normal?

YES : Go to Step 4.
NO :  Remove the A/T from the vehicle, then check and 

repair the inside.

STEP 4. Check the transmission fluid level.
Q: Is the check result normal?

YES : Adjust the transmission fluid level, and then go to 

Step 5.

NO :  Go to Step 5.

STEP 5. Check the signals of input shaft speed sensor and 
output shaft speed sensor.
Check the signals of C-37 TCM connector terminal No. 37 and 
No. 38.
Refer to 

P.23C-158

.

Q: Is the check result normal?

YES : Go to Step 6.
NO :  Repair or replace the failure section.

STEP 6. Hydraulic pressure test
Refer to 

P.23C-26

.

Q: Is the check result normal?

YES : Go to Step 7.
NO :  Remove the A/T from the vehicle, then check and 

repair the inside.

STEP 7. Erase the DTC code, and drive the vehicle for a 
while.
Check that the normal code is displayed.
Q: Is the check result normal?

YES : The procedure is complete.
NO :  Return to START.

AUTOMATIC TRANSAXLE DIAGNOSIS <A/T>

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AUTOMATIC TRANSAXLE

23C-62

DTC P0731: 1st Gear Incorrect Ratio

.

DESCRIPTIONS OF MONITOR METHODS

• After 1st gear is achieved for 2 seconds, the 

abnormal gear ratio

*1

 is detected for 2 seconds 

continuously, or the engine runup

*2

 is detected 

for 250 milliseconds.

*1

: The actual gear ratio deviates from the target gear 

ratio to the low engine (turbine) speed.

*2

: The actual gear ratio deviates from the target gear 

ratio to the high engine (turbine) speed.

.

MONITOR EXECUTION

• 1st gear driving

.

MONITOR EXECUTION CONDITIONS 
(OTHER MONITOR AND SENSOR)

Other Monitor (There is no temporary DTC stored 

in memory for the item monitored below)

• P0846: Malfunction of the 2-6 brake pressure 

switch system

• P0876: Malfunction of the High clutch pressure 

switch system

• P0988: Malfunction of the Low-reverse brake 

pressure switch system

Sensor (The sensor below is determined to be 

normal)

• Input shaft speed sensor

• Output shaft speed sensor

• Transmission range switch

• Lock-up and low-reverse brake linear solenoid

• Low clutch linear solenoid

• 2-6 brake linear solenoid

• 3-5 reverse clutch linear solenoid

• High clutch linear solenoid

• Low clutch shift solenoid

• Low-reverse brake shift solenoid

• Engine revolution signal

• CAN communication

.

AUTOMATIC TRANSAXLE DIAGNOSIS <A/T>

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AUTOMATIC TRANSAXLE

23C-63

LOGIC FLOW CHARTS (Monitor Sequence)

.

Good

END

Shift changing is finished

No

No

No

No

No

No

Actual gear ratio     4.978

Malfunction

Timer start

No

Timer     2 secs.

Malfunction

AC802665

Gear position is 1st

Actual gear ratio = 2nd to 4th gear ratio

Continuous failure for 2 sec

Continuous failure for 250 msec

Yes

Yes

Yes

Yes

Yes

Yes

Yes

START

AUTOMATIC TRANSAXLE DIAGNOSIS <A/T>

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AUTOMATIC TRANSAXLE

23C-64

DTC SET CONDITIONS

Check Conditions

• Shift stage: 1st gear.

• Time after shift changing finish: 2 seconds or 

more.

Judgement Criteria

• Gear ratio: 4.978 or more. (0.25 second)

• Gear ratio: 2.114 or more and 2.584 or less. (2 

seconds)

• Gear ratio: 1.392 or more and 1.701 or less. (2 

seconds)

• Gear ratio: 1.021 or more and 1.247 or less. (2 

seconds)

.

OBD-II DRIVE CYCLE PATTERN

1st gear driving for 5 seconds or more

.

TROUBLESHOOTING HINTS (THE MOST 
LIKELY CAUSES FOR THIS CODE TO BE 
SET ARE:)

• Transaxle assembly powertrain parts failure

• Malfunction of the P0715: input shaft speed sen-

sor system

• Malfunction of the P0720: output shaft speed 

sensor system

• Malfunction of the P0748: line pressure linear 

solenoid valve system circuit

• Malfunction of the P0753: low clutch linear sole-

noid valve system circuit

• Malfunction of the P1758: low-reverse brake shift 

solenoid valve system circuit

• Malfunction of the low clutch

• Malfunction of the low one-way clutch

• Malfunction of the valve body assembly

DIAGNOSIS

STEP 1. Check the DTC.
Check that P0715 (input shaft speed sensor) and P0720 (out-
put shaft speed sensor) are set.
Q: Is the DTC set?

YES : Check and repair the relevant DTC system.
NO :  Go to Step 2.

STEP 2. Check the DTC.
Check if the DTC other than P0731 (1st gear ratio) is set.
Q: Is the DTC set?

YES : Check and repair the relevant DTC system.
NO :  Go to Step 3.

STEP 3. Check the transmission fluid properties.
Check the status of the transmission fluid properties (smell, 
color, fouling).

• Black: A/T inside damage, seizure

• Milky: Water intrusion

Q: Is the check result normal?

YES : Go to Step 4.
NO :  Remove the A/T from the vehicle, then check and 

repair the inside.

STEP 4. Check the transmission fluid level.
Q: Is the check result normal?

YES : Go to Step 5.
NO :  Adjust the transmission fluid level, and then go to 

Step 5.