Steering Angle Sensor Circuit Malfunction - Electronically Controlled Brake System

BRAKE CONTROL: ELECTRONICALLY CONTROLLED BRAKE SYSTEM: C1231/31: Steering Angle Sensor Circuit Malfunction

DTC C1231/31 - Steering Angle Sensor Circuit Malfunction

DESCRIPTION

The skid control ECU inputs the steering sensor signal through the CAN communication. When a malfunction occurs in the communication line with the steering sensor, DTC U0126/63 (malfunction in communication with steering angle sensor) is output.






WIRING DIAGRAM





INSPECTION PROCEDURE
NOTE: When replacing the skid control ECU, perform initialization of linear solenoid valve and calibration Initialization.
HINT:
- When U0126 is output together with C1231/31, inspect and repair the trouble areas indicated by U0126/63 first.
- When the speed sensor or the yaw rate (deceleration) sensor has trouble, DTCs for the steering angle sensor may be output even when the steering angle sensor is normal. When DTCs for the speed sensor or yaw rate sensor are output together with other DTCs for 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 HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)
(a) Using Techstream, check for any momentary interruption in the wire harness and connectors between the skid control ECU and steering angle sensor Check For Intermittent Problems.

ABS / VSC / TRAC:





OK:
There are no momentary interruptions.
NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.

2. READ VALUE USING TECHSTREAM (STEERING ANGLE SENSOR)
(a) Check the Data List for proper functioning of the steering angle sensor.

ABS / VSC / TRAC:





OK:
Steering angle value should change.
OK -- REPLACE SKID CONTROL ECU
NG -- Continue to next step.

3. CHECK WIRE HARNESS (STEERING ANGLE SENSOR - BATTERY AND BODY GROUND)




(a) Remove the steering wheel and the column lower cover.
(b) Disconnect the S13 sensor connector.
(c) Turn the power switch ON (READY).
(d) Measure the voltage of the wire harness side connector.
Standard voltage:






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- REPLACE STEERING ANGLE SENSOR