DTC C1233, C1234, C1235, C1236[L3]

id040232805800

DTC

C1233, C1234, C1235, C1236

ABS sensor rotor

DETECTION CONDITION

•  Sudden change in wheel speed signal or no signal for a certain period from any of the four wheels when driving at the specified vehicle speed or more

•  Output error is detected from any of the four wheel-speed sensors when the vehicle goes from a standstill to a speed of 10 km/h {6.2 mph}

•  Sensor output error due to malfunctioning sensor rotor is detected.

•  ABS control operates for 60 s or more.

POSSIBLE CAUSE

•  ABS wheel-speed sensor malfunction (low output)

•  ABS sensor rotor malfunction (foreign material adhering)

•  Improper installation of ABS wheel-speed sensor and/or sensor rotor

•  Excessive clearance between the ABS wheel-speed sensor and sensor rotor

•  ABS HU/CM internal malfunction (Solenoid valve malfunction, pump motor malfunction, clogged lines)

Diagnostic Procedure

STEP	INSPECTION		ACTION
1	INSPECT PID FOR OUTPUT ERROR 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: LF_WSPD LR_WSPD RF_WSPD RR_WSPD • Drive the vehicle. • Verify that the vehicle speeds detected by the four ABS wheel-speed sensors are approximately the same. • Are the vehicle speeds approximately the same?	Yes	Go to Step 3.
1		No	Go to the next step.
2	INSPECT FOR SHORT TO GROUND BETWEEN ABS WHEEL-SPEED SENSOR AND GROUND • Disconnect the ABS wheel-speed sensor connector. • Inspect for no continuity between the following ABS wheel-speed sensor connector terminals (vehicle wiring harness-side) and body ground: ― ABS wheel-speed sensor (RF) B—Body ground ― ABS wheel-speed sensor (LF): B—Body ground ― ABS wheel-speed sensor (RR) B—Body ground ― ABS wheel-speed sensor (LR) B—Body ground • Is the continuity normal?	Yes	Go to the next step.
2		No	Repair or replace the wiring harness, then go to Step 6.
3	INSPECT IF MALFUNCTION OCCURRED DUE TO IMPROPER SENSOR CLEARANCE. • Inspect the clearance between the ABS wheel-speed sensor and the ABS sensor rotor. • Is the clearance normal?	Yes	Go to the next step.
3		No	Replace the ABS wheel-speed sensor, then go to Step 6. (See FRONT ABS WHEEL-SPEED SENSOR REMOVAL/INSTALLATION.) (See REAR ABS WHEEL-SPEED SENSOR REMOVAL/INSTALLATION.)
4	VISUALLY INSPECT ABS SENSOR ROTOR FOR FOREIGN MATERIAL ADHERING OR IMPROPER INSTALLATION • Is the result normal?	Yes	Go to the next step.
4		No	Replace the ABS sensor rotor, then go to Step 6.
5	INSPECT IF MALFUNCTION OCCURRED DUE TO INTERNAL MALFUNCTION OF HYDRAULIC UNIT (CLOGGING IN PIPING) • Perform the ABS system operation inspection. (See ABS SYSTEM INSPECTION[L3].) • Is the system normal?	Yes	Go to the next step.
5		No	Replace the ABS HU/CM, then go to the next step. (See ABS HU REMOVAL/INSTALLATION.)
6	VERIFY THAT THE SAME DTC IS NOT PRESENT • Clear the DTC from the memory. (See ON-BOARD DIAGNOSIS[L3].) • Start the engine and drive the vehicle at 10 km/h {6.2 mph} or more. • Is the same DTC present?	Yes	Repeat the inspection from Step 1. If the malfunction recurs, replace the ABS HU/CM. (See ABS HU REMOVAL/INSTALLATION.)
6		No	Go to the next step.
7	VERIFY THAT NO OTHER DTCs ARE PRESENT • Are any other DTCs present?	Yes	Go to the applicable DTC inspection. (See ON-BOARD DIAGNOSIS[L3].)
7		No	DTC inspection completed.

DTC	C1233, C1234, C1235, C1236		ABS sensor rotor
DETECTION CONDITION		• Sudden change in wheel speed signal or no signal for a certain period from any of the four wheels when driving at the specified vehicle speed or more • Output error is detected from any of the four wheel-speed sensors when the vehicle goes from a standstill to a speed of 10 km/h {6.2 mph} • Sensor output error due to malfunctioning sensor rotor is detected. • ABS control operates for 60 s or more.
POSSIBLE CAUSE		• ABS wheel-speed sensor malfunction (low output) • ABS sensor rotor malfunction (foreign material adhering) • Improper installation of ABS wheel-speed sensor and/or sensor rotor • Excessive clearance between the ABS wheel-speed sensor and sensor rotor • ABS HU/CM internal malfunction (Solenoid valve malfunction, pump motor malfunction, clogged lines)