Mitsubishi Outlander GS45X. Manual - part 1718

DIAGNOSIS <S-AWC(SUPER ALL WHEEL CONTROL)>

TSB Revision

AUTOMATIC TRANSAXLE

23C-177

Code No.C1242: G and Yaw Rate Sensor System (Abnormality of Longitudinal G Sensor Output 
Signal)

CAUTION

• If there is any problem in the CAN bus lines, 

an incorrect diagnostic trouble code may be 
set. Prior to this diagnosis, diagnose the CAN 
bus lines.

• Whenever the ECU is replaced, ensure that 

the CAN bus lines are normal.

• Do not drop the G and yaw rate sensor or sub-

ject it to a shock.

• When G and yaw rate sensor is replaced, cali-

brate G and yaw rate sensor (refer to GROUP 
35C 

− On-vehicle Service 

P.35C-282

)

.

OPERATION

AWC-ECU receives the G and yaw rate sensor data 
from ASC-ECU via the CAN communication.

.

DIAGNOSTIC TROUBLE CODE SET 
CONDITIONS

This diagnostic trouble code is set when the abnor-
mality below is detected:

• Abnormality in G and yaw rate sensor output 

value

• This diagnostic trouble code is set when 

AWC-ECU determines that an abnormality is 
present by comparing the longitudinal G that is 
output from the G and yaw rate sensor during 
braking with the calculation value calculated by 
the data from the wheel speed sensor.

.

PROBABLE CAUSES

• Malfunction of G and yaw rate sensor

• Improper installation of G and yaw rate sensor

• Malfunction of wheel speed sensor

• Malfunction of stoplight switch

• Stoplight switch circuit system malfunction

• Malfunction of AWC-ECU

DIAGNOSTIC PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics.
Use scan tool to perform the CAN bus diagnosis.
Q: Is the check result normal?

YES : Go to Step 3.
NO :  Repair the CAN bus lines. (Refer to GROUP 54C 

− 

Troubleshooting 

P.54C-17

). After repairing the CAN 

bus line, go to Step 2.

STEP 2. Check whether the diagnostic trouble code is 
reset.
Q: Is diagnostic trouble code No.C1242 set?

YES : Go to Step 3.
NO :  This diagnosis is complete.

STEP 3. M.U.T.-III diagnostic trouble code.
Check the ASC diagnostic trouble code. (Refer to GROUP 35C 
− Troubleshooting 

P.35C-18

).

Q: Is the check result normal?

YES : Perform the relevant troubleshooting.
NO :  Go to Step 4.

DIAGNOSIS <S-AWC(SUPER ALL WHEEL CONTROL)>

TSB Revision

AUTOMATIC TRANSAXLE

23C-178

STEP 4. M.U.T.-III diagnostic trouble code.
Check if the wheel speed sensor-related diagnostic trouble 
code is set.
Q: Is the diagnostic trouble code set?

YES : Perform the relevant troubleshooting.
NO :  Go to Step 5.

STEP 5. Check of G and yaw rate sensor installation 
status.
Check that the G and yaw rate sensor is installed correctly. 
(Refer to GROUP 35C 

− G and Yaw Rate Sensor 

P.35C-290

).

Q: Is the check result normal?

YES : Go to Step 6.
NO :  Reinstall the G and yaw rate sensor correctly. Then 

go to Step 6.

STEP 6. M.U.T.-III data list.
Item No.27: Longitudinal G sensor (refer to 

P.23C-254

).

Q: Is the check result normal?

YES : Go to Step 7.
NO :  Replace the G and yaw rate sensor. (Refer to 

GROUP 35C 

− G and Yaw Rate Sensor 

P.35C-290

). 

Then go to Step 8.

STEP 7. Check whether the diagnostic trouble code is 
reset.
Q: Is diagnostic trouble code No.C1242 set?

YES : Replace the AWC-ECU. (Refer to 

P.23C-295

). Then 

go to Step 8.

NO :  Intermittent malfunction. (Refer to GROUP 00 

− How 

to Cope with Intermittent Malfunction 

P.00-15

).

STEP 8. Check whether the diagnostic trouble code is 
reset.
Q: Is diagnostic trouble code No.C1242 set?

YES : Return to Step 1.
NO :  This diagnosis is complete.

DIAGNOSIS <S-AWC(SUPER ALL WHEEL CONTROL)>

TSB Revision

AUTOMATIC TRANSAXLE

23C-179

Code No.C145F: System Disable Mode (over temperature)

CAUTION

• If there is any problem in the CAN bus lines, 

an incorrect diagnostic trouble code may be 
set. Prior to this diagnosis, diagnose the CAN 
bus lines.

• Whenever the ECU is replaced, ensure that 

the CAN bus lines are normal.

.

OPERATION

The AWC-ECU calculates the transfer temperature 
by the information of the electronic control coupling 
(center) control amount, outside temperate, etc. If it 
is detected that the transfer temperature becomes 
extremely high, the high fluid temperature warning is 
displayed on the warning indicator.

.

DIAGNOSTIC TROUBLE CODE SET 
CONDITIONS

This diagnostic trouble code is set when the control 
is suspended to protect the transfer.

.

PROBABLE CAUSES

• Transfer protection control status (overheat)

• Electronic control coupling (center) failure (clutch 

slippage, etc.)

• A/T fluid temperature signal failure

• Outside temperature signal failure

• Wheel speed signal failure

• Engine-related failure (engine speed signal fail-

ure)

• Ignition off time signal failure

DIAGNOSTIC PROCEDURE

STEP 1. Check whether the diagnostic trouble code is 
reset.
(1) To release the transfer protection control, leave the vehicle 

for 15 minutes or longer after the high fluid temperature 
warning on the warning indicator disappears.

(2) Erase the diagnostic trouble code.
(3) Carry out the test drive.

NOTE: Do not carry out the severe test drive.

(4) Check if the diagnostic trouble code is set.
Q: Is diagnostic trouble code No.C145F set?

YES : Go to Step 2.
NO :  This diagnosis is complete.

STEP 2. M.U.T.-III CAN bus diagnostics.
Use scan tool to perform the CAN bus diagnosis.
Q: Is the check result normal?

YES : Go to Step 4.
NO :  Repair the CAN bus lines. (Refer to GROUP 54C 

− 

Troubleshooting 

P.54C-17

). After repairing the CAN 

bus line, go to Step 3.

STEP 3. Check whether the diagnostic trouble code is 
reset.
Q: Is diagnostic trouble code No.C145F set?

YES : Go to Step 4.
NO :  This diagnosis is complete.

DIAGNOSIS <S-AWC(SUPER ALL WHEEL CONTROL)>

TSB Revision

AUTOMATIC TRANSAXLE

23C-180

STEP 4. M.U.T.-III data list
Item 12: Engine speed (Refer to 

P.23C-254

).

Q: Is the check result normal?

YES : Go to Step 5.
NO :  Perform the troubleshooting for the engine control 

system. (Refer to GROUP 13B 

− Troubleshooting 

P.13B-50

).

STEP 5. M.U.T.-III data list
Item 16: T/M oil temperature (Refer to 

P.23C-254

).

Q: Is the check result normal?

YES : Go to Step 6.
NO :  Perform the troubleshooting for the A/T. (Refer to 

P.23C-164

).

STEP 6. M.U.T.-III data list
Check the following data list. (Refer to 

P.23C-254

).

• Item No.21: Wheel speed sensor <FL>

• Item No.22: Wheel speed sensor <FR>

• Item No.23: Wheel speed sensor <RL>

• Item No.24: Wheel speed sensor <RR>

Q: Is the check result normal?

YES : Go to Step 7.
NO :  Perform the troubleshooting for the ASC. (Refer to 

GROUP 35C 

− Troubleshooting 

P.35C-18

).

STEP 7. M.U.T.-III data list
Check the following data list. (Refer to 

P.23C-254

).

• Item No.34: Ambient temperature (CAN input)

• Item No.35: Ignition off time (CAN input)

Q: Is the check result normal?

YES : Go to Step 8.
NO :  Perform the troubleshooting for the ETACS. (Refer to 

GROUP 54A 

− ETACS, Troubleshooting 

P.54A-732

).

STEP 8. Check of the electronic control coupling (center)
Refer to 

P.23C-273

.

Q: Is the check result normal?

YES : Go to Step 9.
NO :  Replace the electronic control coupling (center). 

(Refer to GROUP 27C 

− Electronic Control Coupling 

P.27C-97

).