Mitsubishi Outlander GS45X. Manual — part 438

DIAGNOSIS

TSB Revision

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

TSB Revision

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-180

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

TSB Revision

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-181

• 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

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.