C1143

C1143, C1144 STEERING ANGLE SENSOR





Description
The steering angle sensor detects the rotation amount, angular velocity and direction of the steering wheel, and transmits the data to the ABS actuator and electric unit (control unit) via CAN communication.




DTC Logic

DTC DETECTION LOGIC






DTC CONFIRMATION PROCEDURE
1.CHECK SELF-DIAGNOSIS RESULTS
Check the self-diagnosis results.





Is above displayed on the self-diagnosis display?
YES - Proceed to diagnosis procedure. Refer to C1143.
NO - INSPECTION END




Diagnosis Procedure
1.VEHICLE INSPECTION
Check that the vehicle equips 4WAS.
Does the vehicle equips 4WAS?
YES - Check 4WAS system. Refer to Diagnosis System (4WAS Front Control Unit) (4WAS
FRONT CONTROL UNIT), Diagnosis System (4WAS Main Control Unit) (4WAS
MAIN CONTROL UNIT).
NO - GO TO 2.
2.CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect ABS actuator and electric unit (control unit) connector.
3. Disconnect steering angle sensor connector.
4. Check terminal for deformation, disconnection, looseness, and so on. If any malfunction is found, repair or replace terminal.
5. Reconnect connectors and then perform the self-diagnosis.
Is any item indicated on the self-diagnosis display?
YES - GO TO 3.
NO - Poor connection of connector terminal. Repair or replace connector.
3.CHECK STEERING ANGLE SENSOR HARNESS
1. Turn ignition switch OFF.
2. Disconnect steering angle sensor connector.
3. Check continuity between steering angle sensor harness connector terminal and ground.





4. Turn ignition switch ON.
5. Check voltage between steering angle sensor harness connector terminal and ground.





Is the inspection result normal?
YES - GO TO 4.
NO - Replace steering angle sensor and adjust neutral position of steering angle sensor.
4.CHECK DATA MONITOR
1. Connect the steering angle sensor connector and ABS actuator and electric unit (control unit) connector.
2. Select "STR ANGLE SIG" in "DATA MONITOR" and check steering angle sensor signal.





Is the inspection result normal?
YES - Replace ABS actuator and electric unit (control unit).
NO - Replace steering angle sensor and adjust neutral position of steering angle sensor.




Component Inspection
1.CHECK DATA MONITOR
Select "STR ANGLE SIG" in "DATA MONITOR" and check steering angle sensor signal.





Is the inspection result normal?
YES - INSPECTION END
NO - Go to diagnosis procedure. Refer to C1143.




Special Repair Requirement
1.ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION
Always perform the neutral position adjustment for the steering angle sensor, when replacing the steering angle sensor or the ABS actuator and electric unit (control unit). Refer to Description.
- END