2018 / ECLIPSE CROSS / EC - Workshop Manual
23 -AUTOMATIC TRANSMISSION > 23A-CVT > TROUBLESHOOTING<S-AWC><S-AWC> > DIAGNOSIS CODE PROCEDURES > CODE NO. C121A STEERING WHEEL SENSOR SYSTEM (NEUTRAL LEARNING ABNORMALITY)
Code No. C121A: Steering Wheel Sensor System (neutral learning abnormality)
| caution | - If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines.
- Whenever the ECU is replaced, ensure that the CAN bus lines are normal.
- When the steering wheel sensor is replaced, calibrate the steering wheel sensor (Refer to GROUP 35C - On-vehicle Service
 ), and reset the steering wheel sensor correction amount set in the AWC-ECU (Item No. 1: Steering angle adjusted value ).
|
OPERATION
Steering wheel sensor stores the neutral position learned by the M.U.T.-IIISE. When the neutral position has not been learned, the steering wheel sensor outputs the signal indicating that the learning has not been performed.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set when it is detected that the steering wheel sensor has not learned the neutral position.
PROBABLE CAUSES
- Steering wheel sensor neutral point not learned
- Malfunction of steering wheel sensor
- Malfunction of AWC-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-IIISE CAN bus diagnostics.
STEP 2. Steering wheel sensor calibration.
STEP 3. Check whether the diagnosis code is set again.
Go to Step 2.
Repair the CAN bus lines (Refer to GROUP 54C - Troubleshooting