Mitsubishi Outlander GS45X. Manual - part 1733

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

TSB Revision

AUTOMATIC TRANSAXLE

23C-237

Code No.U1427: Wheel Speed Sensor Data Malfunction

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

AWC-ECU communicates with the ASC-ECU via the 
CAN bus lines.

.

DIAGNOSTIC TROUBLE CODE SET 
CONDITIONS

The code is set when abnormality is detected in the 
wheel speed sensor signal received from the 
ASC-ECU.

.

PROBABLE CAUSES

• Malfunction of the CAN bus line

• Malfunction of the wheel speed sensor

• Malfunction of ASC-ECU

• 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 2.
NO :  Repair the CAN bus lines. (Refer to GROUP 54C 

− 

Troubleshooting 

P.54C-17

).

STEP 2. M.U.T.-III diagnostic trouble code.
Check the ASC diagnostic trouble code. (Refer to GROUP 35C 
− Troubleshooting 

P.35C-18

).

Q: Is the diagnostic trouble code set?

YES : Perform the relevant troubleshooting.
NO :  Go to Step 3.

STEP 3. M.U.T.-III data list.
Check the data list of the relevant wheel speed sensor. (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 : Intermittent malfunction. (Refer to GROUP 00 

− How 

to Cope with Intermittent Malfunction 

P.00-15

).

NO :  Go to Step 4.

STEP 4. Check whether the diagnostic trouble code is 
reset.
Q: Is diagnostic trouble code No.U1427 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

).

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

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AUTOMATIC TRANSAXLE

23C-238

STEP 5. Check whether the diagnostic trouble code is 
reset.
Q: Is diagnostic trouble code No.U1427 set?

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

Code No.U1428: G and Yaw Rate Sensor Data Malfunction

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

The code is set when abnormality is detected in the 
G and yaw rate sensor signal received from the 
ASC-ECU.

.

PROBABLE CAUSES

• Malfunction of G and yaw rate sensor

• Malfunction of G and yaw rate sensor power sup-

ply

• Damaged connector(s)

• Malfunction of the CAN bus line

• Malfunction of AWC-ECU

• Malfunction of ASC-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 2.
NO :  Repair the CAN bus lines. (Refer to GROUP 54C 

− 

Troubleshooting 

P.54C-17

).

STEP 2. M.U.T.-III diagnostic trouble code.
Check the ASC diagnostic trouble code. (Refer to GROUP 35C 
− Troubleshooting 

P.35C-18

).

Q: Is the diagnostic trouble code set?

YES : Perform the relevant troubleshooting.
NO :  Go to Step 3.

STEP 3. M.U.T.-III diagnostic trouble code.
Check if the AWC diagnostic trouble code No.C123C, C1242 is 
set. (Refer to 

P.23C-27

).

Q: Is the check result normal?

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

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

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AUTOMATIC TRANSAXLE

23C-239

STEP 4. M.U.T.-III data list.
Check the data list below. (Refer to 

P.23C-254

).

• Item No.25: Yaw rate sensor

• Item No.26: Lateral G sensor

• Item No.27: Longitudinal G sensor

Q: Is the check result normal?

YES : Go to Step 5.
NO :  Replace the G and yaw rate sensor. (Refer to 

GROUP 35C 

− G and Yaw Rate Sensor 

P.35C-290

). 

Then go to Step 6.

STEP 5. Check whether the diagnostic trouble code is 
reset.
Q: Is diagnostic trouble code No.U1428 set?

YES : Replace the AWC-ECU. (Refer to 

P.23C-295

). Then 

go to Step 6.

NO :  Intermittent malfunction. (Refer to GROUP 00 

− How 

to Cope with Intermittent Malfunction 

P.00-15

).

STEP 6. Check whether the diagnostic trouble code is 
reset.
Q: Is diagnostic trouble code No.U1428 set?

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

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

TSB Revision

AUTOMATIC TRANSAXLE

23C-240

SYMPTOM PROCEDURES

INSPECTION PROCEDURE 1: Communication between scan tool and AWC-ECU cannot be 
established

CAUTION

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

an incorrect trouble symptom may occur. 
Prior to this diagnosis, always diagnose the 
CAN bus lines.

• Whenever the ECU is replaced, ensure that 

the CAN bus lines are normal.

.

SYMPTOMS

CAN bus line, AWC-ECU power supply circuit, or 
AWC-ECU may have a problem.

.

PROBABLE CAUSES

• Wrong M.U.T.-III wiring harness

• The CAN bus line is defective.

• AWC-ECU power supply circuit malfunction

• Malfunction of AWC-ECU

• ECU malfunction of other system

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 : Check/repair the AWC-ECU power supply circuit. 

(Refer to 

P.23C-241

.)

NO :  Repair the CAN bus lines. (Refer to GROUP 54C 

− 

Troubleshooting 

P.54C-17

).