C1231
C1231Description
The brake ECU inputs the steering angle sensor signal through the CAN communication. When a malfunction occurs in the communication line with the steering angle sensor, DTC U0126 (malfunction in communication with steering angle sensor) is output.
C1231:
Diagnosis Procedure
NOTE:
^ When U0126 is output together with C1231, inspect and repair the trouble areas indicated by U0126 first.
^ When the wheel 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 wheel sensor or yaw rate sensor are output together with other DTCs for the steering angle sensor, inspect and repair the wheel sensor and yaw rate sensor first, and then inspect and repair the steering angle sensor.
1.CHECK DTC
1. Clear the DTC.
2. Turn the ignition switch OFF.
3. Turn the ignition switch ON again and check that no CAN communication system DTC is output.
4. Drive the vehicle and turn the steering wheel to the right and left at the speed of 35 km/h (22 MPH) and check that no wheel sensor and yaw rate sensor DTCs are output.
Result:
NOTE:
^ If there is a malfunction in the wheel sensor or the yaw rate sensor, an abnormal value may be output although the steering angle sensor is normal.
^ If the wheel sensor and yaw rate sensor DTCs are output simultaneously, repair the sensors and inspect the steering angle sensor.
A >> GO TO 2.
B >> Inspect CAN communication system.
C >> Repair circuit indicated by output DTC.
2.INSPECT STEERING ANGLE SENSOR (POWER SOURCE TERMINAL)
1. Turn the ignition switch OFF.
2. Remove the steering wheel and the column cover lower.
3. Disconnect the steering angle sensor connector M53.
4. Measure the voltage according to the value(s) in the table below.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace harness or connector.
3.INSPECT STEERING ANGLE SENSOR (GROUND TERMINAL)
1. Turn the ignition switch OFF.
2. Measure the resistance according to the value(s) in the table below.
NOTE:
If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step.
Is the inspection result normal?
YES >> Replace steering angle sensor.
NO >> Repair or replace harness or connector.
Special Repair Requirement
1.ZERO ADJUSTMENT FOR EACH SENSOR AND OFFSET LEANING FOR LINEAR SOLENOID VALVE
After erasing brake ECU memories, perform zero adjustment of following sensors and initialization of linear solenoid valve.
^ Steering angle sensor: BRC-9, "PERFORM ZERO POINT OF STEERING ANGLE SENSOR: Description". Testing and Inspection
^ Yaw rate/side/decel G sensor: BRC-8, "PERFORM ZERO POINT OF YAW RATE/SIDE/DECEL G SENSOR: Description". Testing and Inspection
^ Brake stroke sensor: BRC-9, "PERFORM ADJUSTMENT OF STROKE SENSOR: Description". Perform Adjustment of Stroke Sensor
^ Linear solenoid valve: BRC-7, "PERFORM INITIALIZATION OF LINEAR SOLENOID VALVE AND CALIBRATION: Description". Perform Initialization of Linear Solenoid Valve and Calibration
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