C1231

BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: 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 the CAN communication system. When there is a malfunction in the CAN communication system, it will be detected by the diagnostic function.





HINT
DTC C1231/31 is cleared automatically when the ignition switch is turned from off to ON after the voltage supply to the steering angle sensor returns to normal.

WIRING DIAGRAM





INSPECTION PROCEDURE

HINT
When U0073/94, U0123/62, U0124/69 or U0126/63 is output together with C1231/31, inspect and repair the trouble areas indicated by U0073/94, U0123/62, U0124/69 or U0126/63 first.

NOTICE:
* When replacing the VSC actuator assembly, perform zero point calibration Programming and Relearning.
* Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1. PERFORM INITIALIZATION OF STEERING ANGLE SENSOR

(a) Check that the steering wheel is in the centered position.

(b) Disconnect the negative battery terminal for more than 2 seconds.

NOTICE:
After the ignition switch is turned off, the navigation system requires approximately 90 seconds to record various types of memory and settings. As a result, after turning the ignition switch off, wait 90 seconds or more before disconnecting the cable from the negative (-) battery terminal.

(c) Reconnect the negative battery terminal.

(d) After driving the vehicle straight ahead at 15 km/h (9.3 mph) or more for a few seconds, drive the vehicle at a speed of 45 km/h (28 mph) or more and turn the steering wheel to the right and left for several seconds.

NEXT -- Continue to next step.

2. READ VALUE USING TECHSTREAM (STEERING ANGLE SENSOR)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream ON.

(d) Check that the steering wheel is centered.

(e) Select the Data List mode on the Techstream.

(1) Techstream

ABS/VSC/TRAC





(f) Check that the steering wheel turning angle of the steering angle sensor changes when turning the steering wheel.

OK:

Turning the steering wheel to the left: Value increases

Turning the steering wheel to the right: Value decreases

NG -- CHECK CAN COMMUNICATION SYSTEM
OK -- Continue to next step.

3. RECONFIRM DTC

(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.

(b) Start the engine.

(c) After driving the vehicle straight ahead at 15 km/h (9.3 mph) or more for a few seconds, drive the vehicle at a speed of 45 km/h (28 mph) or more and turn the steering wheel to the right and left for several seconds.

(d) Check if the same DTC is recorded Reading and Clearing Diagnostic Trouble Codes.

Result





B -- CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) How To Proceed With Troubleshooting

A -- REPLACE VSC ACTUATOR ASSEMBLY Removal

4. CHECK CAN COMMUNICATION SYSTEM

(a) Check if the CAN communication system DTC is output Diagnosis System.

Result





B -- GO TO CAN COMMUNICATION SYSTEM Initial Inspection and Diagnostic Overview
A -- Continue to next step.

5. CHECK STEERING ANGLE SENSOR

(a) Check that the steering angle sensor has been installed correctly Installation.

OK:

The sensor is installed correctly.

NG -- INSTALL STEERING ANGLE SENSOR CORRECTLY
OK -- Continue to next step.

6. CHECK HARNESS AND CONNECTOR (STEERING ANGLE SENSOR - BATTERY AND BODY GROUND)

(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:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

7. REPLACE STEERING ANGLE SENSOR

(a) Replace the steering angle sensor Removal.

NEXT -- Continue to next step.

8. RECONFIRM DTC

(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.

(b) Start the engine.

(c) Drive the vehicle at a speed of 45 km/h (28 mph) or more and turn the steering wheel to the right and left for several seconds.

(d) Check if the same DTC is recorded Reading and Clearing Diagnostic Trouble Codes.

Result





B -- END

A -- REPLACE VSC ACTUATOR ASSEMBLY Removal