S-AWC

DTC C100A [FL], C1015 [FR], C1020 [RL], C102B [RR]: Wheel Speed Sensor System (Faulty Circuit)

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
Observe the wheel speed at start-up. If one or more of the wheel speed does not follow, the diagnostic trouble code of the relevant wheel speed sensor is set.

PROBABLE CAUSES
^ Malfunction of wheel speed sensor
^ Damaged harness wires and connectors
^ Malfunction of encoder for wheel speed detection
^ Malfunction of ASC-ECU
^ Malfunction of AWC-ECU

DIAGNOSTIC PROCEDURE

STEP 1. Scan tool CAN bus diagnostics
Using scan tool MB991958, diagnose the CAN bus lines.
Q: Is the check result normal?
YES: Go to Step 3.
NO: Repair the CAN bus lines. 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?
YES: Go to Step 3.
NO: This diagnosis is complete.

STEP 3. Scan tool diagnostic trouble code
Check the ASC diagnostic trouble code. Diagnostic Trouble Code Descriptions
Q: Is the DTC set?
YES: Perform the relevant troubleshooting.
NO: Go to Step 4.

STEP 4. Scan tool service data
Check the service data of the relevant wheel speed sensor. (Data List Reference Table)
^ Item No.22: FL wheel speed sensor [FL]
^ Item No.23: FL wheel speed sensor [FR]
^ Item No.24: FL wheel speed sensor [RL]
^ Item No.25: FL wheel speed sensor [RR]
Q: Is the check result normal?
YES: Intermittent malfunction.
NO: Replace the AWC-ECU.