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)>

TSB Revision

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?