C1231

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: C1231/31: Steering Angle Sensor Circuit Malfunction

DTC C1231/31 - Steering Angle Sensor Circuit Malfunction

DTC C1290/66 - Steering Angle Sensor Zero Point Malfunction

DESCRIPTION

The steering angle sensor signal is sent to the skid control ECU via the CAN communication system. When there is a malfunction in the communication system, the DTC will be detected by the diagnosis function.





WIRING DIAGRAM





INSPECTION PROCEDURE

HINT:
- When U0073/94, U0123/62, U0124/95 or U0126/63 are output together with C1231/31, inspect and repair the trouble areas indicated by U0073/94, U0123/62, U0124/95 or U0126/63 first.
- When the speed sensor or the yaw rate sensor has trouble, DTCs relating to the steering angle sensor may be output even when the steering angle sensor is normal. When DTCs relating to the speed sensor (C0200/31, C0205/32, C0210/33, C0215/34, C1235/35, C1236/36, C1238/38, C1239/39) or yaw rate (deceleration) sensor (C1232/32, C1234/34, C1243/43, C1244/44, C1245/45, C1381/97) are output together with other DTCs relating to the steering angle sensor, inspect and repair the speed sensor and yaw rate (deceleration) sensor first, and then inspect and repair the steering angle sensor.

PROCEDURE

1. CHECK CAN COMMUNICATION SYSTEM
(a) Check CAN communication system DTC (Symptom Related Diagnostic Procedures).





NG -- REPAIR CAN COMMUNICATION SYSTEM
OK -- Continue to next step.
2. READ VALUE USING DATA LIST (STEERING ANGLE SENSOR)
(a) Connect Techstream to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) Turn the tester ON.
(d) Select "Data List" mode on Techstream.

ABS/VSC/TRAC





(e) Check that the steering angle sensor value displayed on Techstream changes when turning the steering wheel.
OK:
Steering angle sensor value changes.

Result





C -- CHECK TERMINAL VOLTAGE (STEERING ANGLE SENSOR)
B -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
A -- Continue to next step.
3. RECONFIRM DTC
(a) Clear the DTCs (Reading and Clearing Diagnostic Trouble Codes).
(b) Check if the same DTCs are recorded.





B -- END
A -- REPLACE MASTER CYLINDER SOLENOID
4. CHECK TERMINAL VOLTAGE (STEERING ANGLE SENSOR)
(a) Remove the steering wheel and the column lower cover.
(b) Disconnect the steering angle sensor connector.
(c) Turn the ignition switch to the ON position.
(d) Measure the voltage.
Standard Voltage:





(e) Turn the ignition switch to OFF.
(f) Reconnect the steering angle sensor connector.
(g) Reinstall the steering wheel and the column lower cover.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
5. REPLACE STEERING ANGLE SENSOR
(a) Replace the steering angle sensor.
NEXT -- Continue to next step.
6. RECONFIRM DTC
(a) Clear the DTCs (Reading and Clearing Diagnostic Trouble Codes).
(b) Check if the same DTCs are recorded.





B -- END
A -- REPLACE MASTER CYLINDER SOLENOID