S-AWC

DTC C1014 [FL], C101F [FR], C102A [RL], C1035 [RR]: Wheel speed sensor system (characteristics abnormality)

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
If one or more of the wheel speed is out of the range of the specified value, 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. C1014 [FL], C101F [FR], C102A [RL], or C1035 [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.