Mitsubishi Outlander GS45X. Manual - part 428

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-139

STEP 8. Check the wiring harness between C-312 
ETACS-ECU connector terminal No.16 and C-133 stoplight 
relay connector terminal No.2

• Check the signal line for open circuit.

Q: Is the check result normal?

YES : Go to Step 9.
NO :  Replace the wiring harness.

STEP 9. Diagnostic trouble code recheck
Erase the DTC.
Q: Is diagnostic trouble code No.C1000 set?

YES : Replace the hydraulic unit (integrated with ASC-ECU) 

(Refer to 

P.35C-287

). Then go to Step 10.

NO :  Intermittent malfunction (Refer to GROUP 00 

− How 

to Use Troubleshooting/How to Cope with Intermittent 
Malfunctions 

P.00-15

).

STEP 10. Diagnostic trouble code recheck
Erase the DTC.
Q: Is diagnostic trouble code No.C1000 set?

YES : Return to Step 1.
NO :  The procedure is complete.

Next>>

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-140

35C

DTC C123B: Prolonged operation of ASC

CAUTION

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

rect diagnostic trouble code may be set. Prior to this 
diagnosis, diagnose the CAN bus lines (Refer to 
GROUP 54C 

− CAN Bus Line Diagnostic Flow 

P.54C-10

).

• Whenever ECU is replaced, ensure that the CAN bus 

lines are normal.

• When the steering wheel sensor is replaced, always 

carry out calibration to make ASC-ECU learn the neu-
tral point (Refer to 

P.35C-283

).

• Do not drop or shock the G and yaw rate sensor.
• When the G and yaw rate sensor is replaced, always 

carry out calibration to make ASC-ECU learn the neu-
tral point (Refer to 

P.35C-282

).

• When the hydraulic unit (integrated with ASC-ECU) is 

replaced, always carry out the calibration of the steer-
ing wheel sensor, the G and yaw rate sensor and brake 
fluid pressure sensor (Refer to 

P.35C-282

, 

P.35C-283

 

and 

P.35C-284

).

.

OPERATION

ASC-ECU controls ASC by calculating the data sent from the 
wheel speed sensor, the steering wheel sensor, and the G and 
yaw rate sensor.

.

DTC SET CONDITIONS

This diagnostic trouble code is set when ASC operates for a 
prolonged period.
NOTE: When the vehicle runs on a slippery or rough road, or 
when the vehicle makes the steady turn, this diagnostic trouble 
code may be set.

.

PROBABLE CAUSES

• Steering wheel sensor malfunction

• G and yaw rate sensor malfunction

• Improper installation of wheel speed sensor, steering wheel 

sensor, or G and yaw rate sensor

• ASC-ECU malfunction

• Different steering wheel

• Wheel alignment not performed

DIAGNOSIS

Required Special Tools:

• MB991958 Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827 M.U.T.-III USB Cable

• MB991910 M.U.T.-III Main Harness A

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DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-141

STEP 1. Using scan tool MB991958, diagnose the CAN bus 
lines.
Use scan tool to diagnose the CAN bus lines.
Q: Is the check result normal?

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

− 

CAN Bus Diagnostics Table 

P.54C-17

). On 

completion, go to Step 2.

STEP 2. DTC recheck after resetting CAN bus lines
Q: Is DTC C123B set?

YES : Go to Step 3.
NO :  The procedure is complete.

STEP 3. Check the wheel speed sensor, and G and yaw 
rate sensor-related DTC.
Check that DTCs C100A, C1015, C1020, C102B, C1011, 
C101C, C1027, C1032, C1014, C101F, C102A, C1035, C1041, 
C1042, C1043, C1044, C1219, C2205, C123C, and C2204 are 
also set.
Q: Are DTCs C100A, C1015, C1020, C102B, C1011, C101C, 

C1027, C1032, C1014, C101F, C102A, C1035, C1041, 
C1042, C1043, C1044, C1219, C2205, C123C, and C2204 
also set?
YES : Carry out the diagnosis for the relevant diagnostic 

trouble codes, and then go to Step 10.

NO :  Go to Step 4.

STEP 4. Check of G and yaw rate sensor installation status
Check that the G and yaw rate sensor is installed correctly.
Q: Is the check result normal?

YES : After checking the G and yaw rate sensor, perform 

the calibration of the G and yaw rate sensor to make 
ASC-ECU relearn the neutral point (Refer to 

P.35C-282

). Then go to Step 5.

NO :  Reinstall the G and yaw rate sensor correctly (Refer 

to 

P.35C-290

). Then go to Step 10.

STEP 5. Using scan tool MB991958, check the data list
Check the following data list (Refer to 

P.35C-270

.)

• Item 08: Lateral G sensor

• Item 09: G sensor

• Item 12: Yaw rate sensor

Q: Is the check result normal?

YES : Go to Step 6.
NO :  Replace the G and yaw rate sensor (Refer to 

P.35C-290

). Then go to Step 10.

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-142

STEP 6. Check of steering wheel sensor installation status
Check that the steering wheel sensor is installed correctly.
Q: Is the check result normal?

YES : Go to Step 7.
NO :  Install the steering wheel sensor correctly (Refer to 

P.35C-291

). Then go to Step 7.

STEP 7. Wheel alignment check
Refer to GROUP 33 

− On-vehicles service/Front Wheel Align-

ment Check and Adjustment 

P.33-8

.

Q: Is the check result normal?

YES : After checking the wheel alignment, perform the 

calibration of steering wheel sensor to make 
ASC-ECU relearn the neutral point (Refer to 

P.35C-283

). Then go to Step 8.

NO :  After adjusting the wheel alignment, perform the 

calibration of steering wheel sensor to make 
ASC-ECU relearn the neutral point (Refer to 

P.35C-283

). Then go to Step 8.

STEP 8. Using scan tool MB991958, check the data list
Check the following data list (Refer to 

P.35C-270

).

• Item 11: Steering angle

Q: Is the check result normal?

YES : Go to Step 9.
NO :  Replace the steering wheel sensor (Refer to 

P.35C-291

). Then go to Step 10.

STEP 9. Check whether the DTC is reset.
(1) Erase the DTC.
(2) Drive the vehicle at 12mph (20 km/h) or higher.
Q: Does ASC unnecessary activation occur or is the DTC 

C123B set?
YES : Replace the hydraulic unit (integrated with ASC-ECU) 

(Refer to 

P.35C-287

). Then go to Step 10.

NO :  Intermittent malfunction (Refer to GROUP 00 

− How 

to Use Troubleshooting/How to Cope with Intermittent 
Malfunctions 

P.00-15

).

STEP 10. Check whether the DTC is reset.
(1) Erase the DTC.
(2) Drive the vehicle at 12mph (20 km/h) or higher.
Q: Does ASC unnecessary activation occur or is the DTC 

C123B set?
YES : Return to Step 1.
NO :  The procedure is complete.