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 through the CAN communication system. When there is a malfunction in the communication system, it will be detected by the diagnosis function.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTE: When replacing the master cylinder solenoid, perform zero point calibration Programming and Relearning.

HINT:
- When U0073/94, U0100/65, U0123/62, U0124/95 or U0126/63 is output together with C1231/31 and C1290/66, inspect and repair the trouble areas indicated by U0073/94, U0100/65, U0123/62, U0124/95 or U0126/63 first.
- When the speed sensor or the yaw rate and acceleration sensor has trouble, DTCs of the steering angle sensor may be output even when the steering angle sensor is normal. When DTCs of the speed sensor (C0200/31, C0205/32, C0210/33, C0215/34, C1235/35, C1236/36, C1238/38, C1239/39) or yaw rate and acceleration sensor (C1232/32, C1234/34, C1243/43, C1244/44, C1245/45) are output together with DTCs of the steering angle sensor, inspect and repair the speed sensor and yaw rate and acceleration sensor first, and then inspect and repair the steering angle sensor.

PROCEDURE

1. READ VALUE USING TECHSTREAM (STEERING ANGLE SENSOR)
(a) Connect Techstream to the DLC3.
(b) Turn the ignition switch to ON and turn the Techstream main switch ON.
(c) Select "Data List" mode on Techstream.

ABS/VSC/TRAC





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

NG -- INSPECT STEERING ANGLE SENSOR (POWER SOURCE AND GROUND TERMINAL)
OK -- Continue to next step.

2. RECONFIRM DTC
(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(b) Drive the vehicle at a speed of approximately 10 km/h (6 mph) or more for 10 seconds or more.
(c) Check if the same pending DTCs are detected Reading and Clearing Diagnostic Trouble Codes.
Result:





B -- CHECK FOR INTERMITTENT PROBLEMS
A -- REPLACE MASTER CYLINDER SOLENOID
3. INSPECT STEERING ANGLE SENSOR (POWER SOURCE AND GROUND TERMINAL)




(a) Remove the steering wheel and the column cover lower.
(b) Disconnect the steering angle sensor connector.
(c) Measure the voltage according to the value(s) in the table below.
Standard voltage:





(d) Measure the resistance according to the value(s) in the table below.
Standard resistance:





HINT:
- When troubleshooting in accordance with the DTC CHART, check for DTCs before replacing the steering angle sensor Reading and Clearing Diagnostic Trouble Codes.
- When troubleshooting in accordance with the PROBLEM SYMPTOMS TABLE, be sure to follow the table before replacing the steering angle sensor Problem Symptoms Table.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE OR GROUND CIRCUIT)
OK -- REPLACE STEERING ANGLE SENSOR