Vehicle Stability Control System - RM000001ITC006X

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: 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 CAN communication system. When there is a malfunction in the CAN communication system, it will be detected by the diagnosis function.

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT
* When U0121/94, U0123/62, U0124/95 or U0126/63 is output together with C1231/31, inspect and repair the trouble areas indicated by U0121/94, U0123/62, U0124/95 or U0126/63 first.
* When the speed sensor or the yaw rate 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 sensor first, and then inspect and repair the steering angle sensor.
* Start the inspection from step 1 when using the Techstream and start from step 2 when not using the Techstream.

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)

(a) Using the Techstream, check for any momentary interruption in the wire harness and connectors between the skid control ECU and the steering angle sensor Check For Intermittent Problems.

ABS/VSC/TRAC

OK:

There are no momentary interruptions.

HINT
Perform the above inspection before removing the sensor and connector.

NG -- CHECK AND REPAIR HARNESS AND CONNECTOR (STEERING ANGLE SENSOR TO SKID CONTROL ECU)
OK -- Continue to next step.

2. CHECK STEERING ANGLE SENSOR

(a) Clear the DTC DTC Check / Clear (to 12/2010).

(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) Start the engine.

(e) Drive the vehicle and turn the steering wheel to the right and left at the speed of 35 km/h (24 mph) and check that no speed sensor and yaw rate sensor DTCs are output.

Result:

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

B -- REPAIR CIRCUIT INDICATED BY OUTPUT CODE
A -- Continue to next step.

3. INSPECT STEERING ANGLE SENSOR (IG AND ESS TERMINAL)

(a) Remove the steering wheel and the column lower cover.

(b) Disconnect the steering angle sensor connector.

(c) Turn the ignition switch on (IG).

(d) Measure the voltage according to the value(s) in the table below.

Standard voltage:

(e) Turn the ignition switch off.

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

Standard resistance:

HINT
If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step Problem Symptoms Table (to 12/2010).

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (IG, ESS CIRCUIT)

OK -- REPLACE STEERING ANGLE SENSOR

4. CHECK AND REPAIR HARNESS AND CONNECTOR (STEERING ANGLE SENSOR TO SKID CONTROL ECU)

NEXT -- Continue to next step.

5. RECONFIRM DTC

(a) Clear the DTC DTC Check / Clear (to 12/2010).

(b) Start the engine.

(c) Drive the vehicle and turn the steering wheel to the right and left at the speed of 35 km/h (24 mph) or more.

(d) Check that the same DTC is recorded DTC Check / Clear (to 12/2010).

Result: