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DTC C1011 <FL>, C101C <FR>, C1027 <RL>, C1032 <RR>: Wheel Speed Sensor System (Faulty Signal)


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.

OPERATION


AWC-ECU receives the wheel speed data from ASC-ECU via the CAN communication.

DTC SET CONDITIONS


When an irregular change in the wheel speed sensor is detected, the diagnostic trouble code of the relevant wheel speed sensor is set.

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 3.
Repair the CAN bus lines. (Refer to GROUP 54C - Troubleshooting ). After repairing the CAN bus line, go to Step 2.

STEP 2. Check whether the DTC is reset.

Q. Is the relevant wheel speed sensor diagnostic trouble code No.C1011 <FL>, C101C <FR>, C1027 <RL>, or C1032 <RR> set?
Go to Step 3.
This diagnosis is complete.

STEP 3. Scan tool diagnostic trouble code
Check the ASC diagnostic trouble code. (Refer to GROUP 35C - Troubleshooting ).

Q. Is the DTC set?
Perform the relevant troubleshooting.
Go to Step 4.

STEP 4. Scan tool data list
Check the data list of the relevant wheel speed sensor. (Refer to ).

  • Item No.22: Wheel speed sensor <FL>
  • Item No.23: Wheel speed sensor <FR>
  • Item No.24: Wheel speed sensor <RL>
  • Item No.25: Wheel speed sensor <RR>

Q. Is the check result normal?
Intermittent malfunction. (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
Replace the AWC-ECU. (Refer to ).