Mitsubishi Outlander GS45X. Manual - part 1717

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

TSB Revision

AUTOMATIC TRANSAXLE

23C-173

STEP 9. Check whether the diagnostic trouble code is 
reset.
Q: Is diagnostic trouble code No.C1219 set?

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

Code No.C121A: Steering Wheel Sensor System (neutral learning abnormality)

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.

• When the steering wheel sensor is replaced, 

calibrate the steering wheel sensor (Refer to 
GROUP 35C 

− On-vehicle Service 

P.35C-283

), 

and reset the steering wheel sensor correc-
tion amount stored in the AWC-ECU. (Item No. 
1: SAS adjusted value 

P.23C-256

).

.

OPERATION

Steering wheel sensor stores the neutral position 
learned by the M.U.T.-III. When the neutral position 
has not been learned, the steering wheel sensor out-
puts the signal indicating that the learning has not 
been performed.

.

DIAGNOSTIC TROUBLE CODE SET 
CONDITIONS

This diagnostic trouble code is set when it is 
detected that the steering wheel sensor has not 
learned the neutral position.

.

PROBABLE CAUSES

• Steering wheel sensor neutral point not learned

• Malfunction of steering wheel sensor

• 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.C121A set?

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

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

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AUTOMATIC TRANSAXLE

23C-174

STEP 3. Steering wheel sensor calibration.
Perform calibration of the steering wheel sensor. (Refer to 
GROUP 35C 

− On-vehicle Service 

P.35C-283

).

Q: Has the calibration succeeded?

YES : Go to Step 4.
NO :  Replace the steering wheel sensor. (Refer to GROUP 

35C 

− Steering Wheel Sensor 

P.35C-291

). Then, go 

to Step 4.

STEP 4. Check whether the diagnostic trouble code is 
reset.
Q: Is diagnostic trouble code No.C121A set?

YES : Replace the AWC-ECU. (Refer to 

P.23C-295

). Then, 

go to Step 5.

NO :  Intermittent malfunction. (Refer to GROUP 00 

− How 

to Cope with Intermittent Malfunction 

P.00-15

).

STEP 5. Check whether the diagnostic trouble code is 
reset.
Q: Is diagnostic trouble code No.C121A set?

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

Code No.C123C: G and Yaw Rate Sensor (Faulty 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.

• When the steering wheel sensor is replaced, 

calibrate the steering wheel sensor (Refer to 
GROUP 35C 

− On-vehicle Service 

P.35C-283

), 

and reset the steering wheel sensor correc-
tion amount stored in the AWC-ECU. (Item No. 
1: SAS adjusted value 

P.23C-256

).

• 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

• The yaw rate correction amount of the G and yaw 

rate sensor exceeds the specified range.

• This diagnostic trouble code is set when 

AWC-ECU determines that an abnormality is 
present by comparing the measurement values of 
G and yaw rate sensor with the calculation value 
of G and yaw rate calculated by the measure-
ment values of the wheel speed sensor and 
steering wheel sensor.

.

PROBABLE CAUSES

• Improper installation of G and yaw rate sensor

• Malfunction of G and yaw rate sensor

• Malfunction of wheel speed sensor

• Improper installation of steering wheel sensor

• Malfunction of steering wheel sensor

• Malfunction of AWC-ECU

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

TSB Revision

AUTOMATIC TRANSAXLE

23C-175

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.C123C 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.

STEP 4. M.U.T.-III diagnostic trouble code.
Check if the wheel speed sensor-related, or steering wheel 
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.
Check the following data list. (Refer to 

P.23C-254

).

• Item No.25: Yaw rate sensor

• Item No.26: Lateral G sensor

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 11.

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

TSB Revision

AUTOMATIC TRANSAXLE

23C-176

STEP 7. Check of steering wheel sensor installation status.
Check that the steering wheel sensor is installed correctly. 
(Refer to GROUP 35C 

− Steering Wheel Sensor 

P.35C-291

).

Q: Is the check result normal?

YES : Go to Step 8.
NO :  Install the steering wheel sensor correctly. Then go to 

Step 8.

STEP 8. Wheel alignment check.
Q: Is the check result normal?

YES : After checking the wheel alignment, calibrate the 

steering wheel sensor (Refer to GROUP 35C 

− 

On-vehicle Service 

P.35C-283

), and reset the 

steering wheel sensor correction amount stored in the 
AWC-ECU.(Refer to 

P.23C-256

). Then go to Step 9.

NO :  After adjusting the wheel alignment, calibrate the 

steering wheel sensor (Refer to GROUP 35C 

− 

On-vehicle Service 

P.35C-283

), and reset the 

steering wheel sensor correction amount stored in the 
AWC-ECU.(Refer to 

P.23C-256

). Then go to Step 9.

STEP 9. M.U.T.-III data list.
Item 8: Steering angle sensor (refer to 

P.23C-254

).

Q: Is the check result normal?

YES : Go to Step 10.
NO :  Replace the steering wheel sensor. (Refer to GROUP 

35C 

− Steering Wheel Sensor 

P.35C-291

). Then go to 

Step 10.

STEP 10. Check whether the diagnostic trouble code is 
reset.
Q: Is diagnostic trouble code No.C123C set?

YES : Replace the AWC-ECU. (Refer to 

P.23C-295

). Then 

go to Step 11.

NO :  Intermittent malfunction. (Refer to GROUP 00 

− How 

to Cope with Intermittent Malfunction 

P.00-15

).

STEP 11. Check whether the diagnostic trouble code is 
reset.
Q: Is diagnostic trouble code No.C123C set?

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