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DTC U0126: Steering Wheel Sensor Time-out Error


caution
  • If there is any problem in the CAN bus lines, an incorrect diagnostic trouble 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 initialize the steering angle correction amount stored in AWC-ECU. (Item No.1: Steering angle correction amount initialization .)

OPERATION


AWC-ECU communicates with the steering wheel sensor via the CAN bus lines.

DTC SET CONDITIONS


The code is set when the signal sent from the steering wheel sensor cannot be received for a certain period.

PROBABLE CAUSES



DIAGNOSTIC PROCEDURE

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

Q. Is the check result normal?
Go to Step 2.
Repair the CAN bus lines. (Refer to GROUP 54C - Troubleshooting .)

STEP 2. Scan tool service data
Item No.11: Steering wheel sensor (Refer to service data reference table .)

Q. Is the check result normal?
Intermittent malfunction. (Refer to GROUP 00 - How to Cope with Intermittent Malfunction .)
Replace the steering wheel sensor. (Refer to GROUP 35C - Steering Wheel Sensor .) Then go to Step 3.

STEP 3. Check whether the DTC is reset.

Q. Is DTC No. U0126 set?
Replace the AWC-ECU. (Refer to .) Then go to Step 4.
Intermittent malfunction. (Refer to GROUP 00 - How to Cope with Intermittent Malfunction .)

STEP 4. Check whether the DTC is reset.

Q. Is DTC No. U0126 set?
Return to Step 1.
This diagnosis is complete.