Diagnostic Procedure

WARNING: This page is about a different car, the 2008 Mitsubishi Lancer. However, it is still accessible from the selected car via links, so may be relevant.

STEP 1. Scan tool CAN bus diagnostics
Using scan tool MB991958, diagnose the CAN bus lines.

Q: Is the check result normal?

YES : Go to Step 3.

NO : Repair the CAN bus lines. (Refer to TROUBLESHOOTING .) After repairing the CAN bus line, go to Step 2.
STEP 2. Check whether the DTC is reset.
Q: Is DTC No. C121A set?

YES : Go to Step 3.

NO : This diagnosis is complete.
STEP 3. Steering wheel sensor calibration
Perform calibration of the steering wheel sensor. (Refer to ON-VEHICLE SERVICE .)

Q: Has the calibration succeeded?

YES : Go to Step 4.

NO : Replace the steering wheel sensor. (Refer to STEERING WHEEL SENSOR .) Then, go to Step 4.
STEP 4. Check whether the DTC is reset.
Q: Is DTC No. C121A set?

YES : Replace the AWC-ECU.(Refer to AWC-ECU .) Then, go to Step 5.

NO : Intermittent malfunction. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .)
STEP 5. Check whether the DTC is reset.
Q: Is DTC No. C121A set?

YES : Return to Step 1.

NO : This diagnosis is complete.