Vehicle Stability Control System (For BOSCH Made)

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM (for BOSCH Made): C1231/31: Steering Angle Sensor Circuit Malfunction
C1231/31 - Steering Angle Sensor Circuit 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 CAN communication system, it will be detected by the steering angle sensor zero point malfunction diagnostic function.





WIRING DIAGRAM





INSPECTION PROCEDURE

HINT
* When U0073/94, U0100/63, U0123/62 and/or U0126/63 is output together with C1231/31, inspect and repair the trouble areas indicated by U0073/94, U0100/65, U0123/62 and/or U0126/63 first.
* When the speed sensor or the yaw rate and acceleration 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 and acceleration sensor are output together with other DTCs for 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.
* Check the condition of each related circuit connector before troubleshooting Electronic Circuit Inspection Procedure.

PROCEDURE

1. CHECK DTC

(a) Clear the DTC Vehicle Stability Control System (for BOSCH Made).

(b) Turn the ignition switch off.

(c) Turn the ignition switch on (IG) again and check that no CAN communication system DTC is output.

(d) Drive the vehicle and turn the steering wheel to the right and left at the speed of 22 mph (35 km/h) and check that no speed sensor and yaw rate and acceleration sensor DTCs are output Vehicle Stability Control System (for BOSCH Made).

Result:





HINT
* If there is a malfunction in the speed sensor or the yaw rate and acceleration sensor, an abnormal value may be output although the steering angle sensor is normal.
* If the speed sensor and the yaw rate and acceleration sensor DTCs are output simultaneously, repair the sensors and inspect the steering angle sensor.

C -- REPAIR CIRCUITS INDICATED BY OUTPUT DTCS Vehicle Stability Control System (for BOSCH Made)

B -- INSPECT CAN COMMUNICATION SYSTEM How to Proceed With Troubleshooting
A -- Continue to next step.

2. INSPECT STEERING ANGLE SENSOR (POWER SOURCE TERMINAL)

(a) Remove 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:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)
OK -- Continue to next step.

3. INSPECT STEERING ANGLE SENSOR (GROUND TERMINAL)

(a) Measure the resistance according to the value(s) in the table below.





Standard resistance:





(b) Connect the connector.

(c) Install the column cover lower.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT)

OK -- REPLACE STEERING ANGLE SENSOR Removal