DTC C1233, C1234, C1235, C1236 [DSC/RSC]

id0402b3801600

DTC | C1233 C1234 C1235 C1236 | LF ABS wheel-speed sensor/ABS sensor rotor system RF ABS wheel-speed sensor/ABS sensor rotor system RR ABS wheel-speed sensor/ABS sensor rotor system LR ABS wheel-speed sensor/ABS sensor rotor system
DETECTION CONDITION | • Vehicle wheel speed signals of any of the four vehicle wheels indicate abnormal acceleration that exceeds specification. • Periodic abnormality is detected in the signal wave pattern from the ABS wheel-speed sensors.
POSSIBLE CAUSE | • ABS wheel-speed sensor malfunction (low output, metal shavings on sensor) • ABS sensor rotor malfunction (chipping of sensor rotor teeth) • Poor installation of ABS wheel-speed sensor and/or sensor rotor • DSC/RSC HU/CM malfunction • Excessive clearance between the ABS wheel-speed sensor and sensor rotor

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | INSPECT PID FOR ABNORMAL OUTPUT FROM ABS WHEEL-SPEED SENSOR USING M-MDS • Turn the ignition switch off. • Connect the M-MDS to the DLC-2. • Select the following PIDs using the M-MDS: ― WSPD_LF ― WSPD_LR ― WSPD_RF ― WSPD_RR • Start the engine and drive the vehicle. • Verify that the PIDs of the four ABS wheel-speed sensors correspond approximately. • Do the vehicle speeds correspond? | Yes | Go to Step 4.
No | If there is a difference in speeds of the four wheels, go to the next step.
2 | INSPECT IF MALFUNCTION OCCURRED DUE TO IMPROPER SENSOR CLEARANCE. • Inspect the clearance between the ABS wheel-speed sensor and the ABS sensor rotor. (See FRONT ABS WHEEL-SPEED SENSOR INSPECTION.) (See REAR ABS WHEEL-SPEED SENSOR INSPECTION [2WD].) (See REAR ABS WHEEL-SPEED SENSOR INSPECTION [4WD].) • Is the clearance normal? | Yes | Go to the next step.
No | Replace the ABS wheel-speed sensor, then go to Step 4. (See FRONT ABS WHEEL-SPEED SENSOR REMOVAL/INSTALLATION.) (See REAR ABS WHEEL-SPEED SENSOR REMOVAL/INSTALLATION [2WD].) (See REAR ABS WHEEL-SPEED SENSOR REMOVAL/INSTALLATION [4WD].)
3 | VISUALLY INSPECT ABS SENSOR ROTOR FOR FOREIGN MATERIAL ADHERING OR IMPROPER INSTALLATION • Is the result normal? | Yes | Go to the next step.
No | Replace the front drive shaft, rear drive shaft, then go to the next step. (See FRONT DRIVE SHAFT REMOVAL/INSTALLATION.) (See REAR DRIVE SHAFT REMOVAL/INSTALLATION.)
4 | VERIFY THAT THE SAME DTC IS NOT PRESENT • Clear the DTC from the memory. (See ON-BOARD DIAGNOSIS [DSC/RSC].) • Start the engine and drive the vehicle at 10 km/h {6.2 mph} or more. • Are the same DTCs present? | Yes | Repeat the inspection from Step 1. If the malfunction recurs, replace the DSC/RSC HU/CM, then go to the next step. (See DSC/RSC HU/CM REMOVAL/INSTALLATION [L.H.D.].) (See DSC/RSC HU/CM REMOVAL/INSTALLATION [R.H.D.].)
No | Go to the next step.
5 | VERIFY THAT NO OTHER DTCS ARE PRESENT • Are any other DTCs output? | Yes | Go to the applicable DTC inspection. (See ON-BOARD DIAGNOSIS [DSC/RSC].)
No | DTC troubleshooting completed.