Diagnostic Procedure
- STEP 1. Scan tool (M.U.T.-III) CAN bus diagnostics.
Use scan tool (M.U.T.-III) to perform the CAN bus diagnosis.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to - Diagnosis, CAN BUS DIAGNOSTICS TABLE ). After repairing the CAN bus line, go to Step 2.
- STEP 2. Check whether the DTC is stored again.
Q: Is DTC No. C121A stored?
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 stored again.
Q: Is DTC No. C121A stored?
YES : Replace the AWC-ECU (Refer to AWC-ECU <VEHICLES WITH S-AWC> ). Then, go to Step 5.
NO : Intermittent malfunction (Refer to - HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
- STEP 5. Check whether the DTC is stored again.
Q: Is DTC No. C121A stored?
YES : Return to Step 1.
NO : This diagnosis is complete.