DTC C100A < FL >, C1015 < FR >, C1020 < RL >, C102B < RR >: Wheel Speed Sensor System (Faulty Circuit): Diagnosis

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STEP 1. Scan tool CAN bus diagnostics
Using scan tool MB991958, 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 ). 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. C100A < FL >, C1015 < FR >, C1020 < RL >, or C102B < RR > set?
1. YES: Go to Step 3.
2. NO: This diagnosis is complete.
STEP 3. Scan tool diagnostic trouble code
Check the ASC diagnostic trouble code. (Refer to DIAGNOSTIC TROUBLE CODE TABLE ).

Q: Is the DTC set?
1. YES: Perform the relevant troubleshooting.
2. NO: Go to Step 4.
STEP 4. Scan tool data list
Check the data list of the relevant wheel speed sensor. (Refer to DATA LIST REFERENCE TABLE ).
- 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?
1. YES: Intermittent malfunction. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
2. NO: Replace the AWC-ECU. (Refer to AWC-ECU ).