Code No. C121A Steering angle sensor initialization: Diagnosis

WARNING: This page is about a different car, the 2014 Mitsubishi Outlander. However, it is still accessible from the selected car via links, so may be relevant.

STEP 1. Scan tool (M.U.T.-III) CAN bus diagnostics
Use scan tool (M.U.T.-III) to diagnose the CAN bus lines.

Q: Is the check result normal?
1. YES: Go to Step 3.
2. NO: Repair the CAN bus lines (Refer to CAN BUS DIAGNOSTICS TABLE ). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines
Q: Is DTC No. C121A stored?
1. YES: Go to Step 3.
2. NO: This diagnosis is complete.
STEP 3. Check how steering wheel sensor is installed.
Check that the steering wheel sensor is installed correctly (Refer to STEERING WHEEL SENSOR ).

Q: Is the check result normal?
1. YES: Go to Step 4.
2. NO: Install the steering wheel sensor correctly (Refer to STEERING WHEEL SENSOR ), and then go to Step 4.
STEP 4. Steering wheel sensor calibration
Perform calibration of steering wheel sensor (Refer to STEERING WHEEL SENSOR CALIBRATION ).

Q: Has the calibration succeeded?
1. YES: Go to Step 5.
2. NO: After the steering wheel sensor is replaced, perform the steering wheel sensor calibration to make ASC-ECU learn the neutral point again (Refer to STEERING WHEEL SENSOR CALIBRATION ). Then go to Step 5.
STEP 5. Check whether the DTC is stored again.
Erase the DTC.

Q: Is DTC No. C121A stored?
1. YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to HYDRAULIC UNIT ), and then go to Step 6.
2. NO: This diagnosis is complete.
STEP 6. Check whether the DTC is stored again.
Erase the DTC.

Q: Is DTC No. C121A stored?
1. YES: Return to Step 1.
2. NO: This diagnosis is complete.