Steering Angle Sensor Circuit Malfunction

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

DTC C1231/31 - Steering Angle Sensor Circuit Malfunction

DTC C1335/35 - Steering Angle Sensor Circuit

DESCRIPTION





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. 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 wheel turning angle value must be changing.
NG -- CHECK WIRE HARNESS (STEERING SENSOR - BATTERY)
OK -- Continue to next step.
2. CHECK SKID CONTROL ECU (+BI VOLTAGE)




(a) Remove the skid control ECU but do not disconnect the connectors.
(b) Turn the ignition switch ON.
(c) Measure the voltage of the connectors.
Standard voltage:






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
3. CHECK WIRE HARNESS (STEERING SENSOR - BATTERY)




(a) Disconnect the S9 sensor connector.
(b) Measure the voltage of the wire harness side connector.
Standard voltage:






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
4. INSPECT STEERING SENSOR




(a) Remove the steering wheel and column lower cover Removal.
(b) Disconnect the steering sensor connector.
(c) Apply battery voltage between terminals 1 (IG1) and 2 (ESS), and 2 (ESS) and 3 (BAT).
(d) Connect an oscilloscope to terminals 9 (SSI-) and 10 (SSI+) of the steering sensor.
(e) Turn the steering column shaft slowly and check the signal waveform.
OK:
Waveform is output as shown above in illustration.
HINT: The above signal waveform does not repeat ON and OFF regularly and this ON to OFF interval changes depending on the steering column shaft movement.

NG -- REPLACE STEERING SENSOR
OK -- REPLACE SKID CONTROL ECU