Mitsubishi Outlander GS45X. Manual - part 438

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-179

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 C123A set?

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

STEP 3. Check other DTC is set.
Check whether the DTC related to G and yaw rate sensor and 
the steering wheel sensor is set.
Q: Is any diagnostic trouble code set?

YES : Diagnose for the DTC (Refer to 

P.35C-18

).

NO :  Go to Step 4.

STEP 4. G and yaw rate sensor calibration
Perform the calibration of G and yaw rate sensor (Refer to 

P.35C-282

).

Q: Has the calibration succeeded?

YES : Go to Step 5.
NO :  Replace the hydraulic unit (integrated with ASC-ECU) 

(Refer to 

P.35C-287

), and then go to Step 8.

STEP 5. Steering wheel sensor calibration
Perform the calibration of steering wheel sensor (Refer to 

P.35C-283

).

Q: Has the calibration succeeded?

YES : Go to Step 6.
NO :  Replace the hydraulic unit (integrated with ASC-ECU) 

(Refer to 

P.35C-287

), and then go to Step 8.

STEP 6. Brake fluid pressure sensor calibration
Perform the calibration of brake fluid pressure sensor (Refer to 

P.35C-284

).

Q: Has the calibration succeeded?

YES : Go to Step 7.
NO :  Replace the hydraulic unit (integrated with ASC-ECU) 

(Refer to 

P.35C-287

), and then go to Step 8.

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

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STEP 7. Check whether the diagnostic trouble code is 
reset.
Erase the DTC.
Q: Is DTC C123A set?

NO :  Replace the hydraulic unit (integrated with ASC-ECU) 

(Refer to 

P.35C-287

), and then go to Step 8.

NO :  Intermittent malfunction (Refer to GROUP 00 

− How 

to Use Troubleshooting/How to Cope with Intermittent 
Malfunctions 

P.00-15

).

STEP 8. Check whether the diagnostic trouble code is 
reset.
Erase the DTC.
Q: Is DTC C123A set?

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

DTC C1219: Abnormality in steering wheel sensor signal

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

).

.

CIRCUIT OPERATION

Steering wheel sensor outputs the signal to ASC-ECU via the 
CAN bus lines.

.

DTC SET CONDITIONS

This diagnostic trouble code is set if any malfunction below is 
found:

• The tolerance of the neutral position of steering wheel sen-

sor exceeds the specified range.

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

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• Abnormality in steering wheel sensor output value

• When abnormality is detected by comparing the value out-

put from the steering wheel sensor with the one from the 
wheel speed sensor and the G and yaw rate sensor.

.

PROBABLE CAUSES

• Improper installation of steering wheel sensor

• Wheel alignment not performed

• Steering wheel sensor malfunction

• Different steering wheel

• G and yaw rate sensor malfunction

• Malfunction of wheel speed sensor

• ASC-ECU malfunction

• External noise interference

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

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 C1219 set?

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

STEP 3. M.U.T.-III DTC
Check that the wheel speed sensor-related, G and yaw rate 
sensor-related, or steering wheel sensor-related DTC is set.
Q: Is the DTC set?

YES : Troubleshoot the relevant DTC, and then go to Step 

9.

NO :  Go to Step 4.

STEP 4. Check how steering wheel sensor is installed.
Check that the steering wheel sensor is installed correctly 
(Refer to 

P.35C-291

).

Q: Is the check result normal?

YES : Go to Step 5.
NO :  Install the steering wheel sensor correctly (Refer to 

P.35C-291

), and then go to Step 5.

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

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STEP 5. G and yaw rate sensor installation check
Check that the G and yaw rate sensor is installed correctly.
Q: Is the check result normal?

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

to 

P.35C-290

), and then go to Step 6.

STEP 6. Wheel alignment check
Refer to GROUP 33 

− On-vehicles service/Front Wheel Align-

ment Check 

P.33-8

.

Q: Is the check result normal?

YES : After the wheel alignment check, perform the steering 

wheel sensor calibration to make ASC-ECU learn the 
neutral point again (Refer to 

P.35C-283

). Then go to 

Step 7.

NO :  After the adjustment of the wheel alignment, perform 

the steering wheel sensor calibration to make 
ASC-ECU learn the neutral position again (Refer to 

P.35C-283

). Then go to Step 7.

STEP 7. Scan tool data list
Check the following data list (Refer to 

P.35C-270

).

• Item 11: Steering angle sensor

Q: Is the check result normal?

YES : Go to Step 8.
NO :  After the steering wheel sensor is replaced (Refer to 

P.35C-291

), perform the steering wheel sensor 

calibration to make ASC-ECU learn the neutral point 
again (Refer to 

P.35C-283

). Then go to Step 9.

STEP 8. Check whether the DTC is reset.
(1) Erase the DTC.
(2) Drive the vehicle at 12mph (20 km/h) or higher.
Q: Is DTC C1219 set?

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

(Refer to 

P.35C-287

), and then go to Step 9.

NO :  The procedure is complete.

STEP 9. Check whether the DTC is reset.
(1) Erase the DTC.
(2) Drive the vehicle at 12mph (20 km/h) or higher.
Q: Is DTC C1219 set?

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