VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1231/31

DTC Code DTC Name
C1231/31 Steering Angle Sensor Circuit Malfunction

DESCRIPTION

Steering angle sensor signals are 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.

DTC Code DTC Detection Condition Trouble Area
C1231/31 The IG1 terminal voltage is 9.5 V or more and a steering angle sensor malfunction signal is received.

  • Steering angle sensor

  • Steering angle sensor circuit

  • Steering angle sensor power supply

  • Skid control ECU

WIRING DIAGRAM

A0160W5E10

INSPECTION PROCEDURE

Tech Tips


  • When U0073/94, U0123/62, U0124/95 and/or U0126/63 is output together with C1231/31, inspect and repair the trouble areas indicated by U0073/94, U0123/62, U0124/95 and/or U0126/63 first Click here.

  • 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 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.

PROCEDURE


  1. CHECK DTC


    1. Clear the DTCs Click here.

    2. Turn the engine switch off.

    3. Turn the engine switch on (IG) again and check that no CAN communication system DTC is output Click here.

    4. Drive the vehicle and turn the steering wheel to the right and left at a speed of 35 km/h (22 mph) and check that no speed sensor or yaw rate sensor DTCs are output Click here.

      Result
      Result Proceed to
      No CAN communication system DTCs and the speed sensor and yaw rate and acceleration sensor DTCs are output A
      CAN communication system DTC is output B
      Speed sensor or yaw rate sensor DTC is output C

      Tech Tips


      • If there is a malfunction in the speed sensor or the yaw rate sensor, an abnormal value may be output although the steering angle sensor is normal.

      • If speed sensor and yaw rate sensor DTCs are output simultaneously, repair these two sensors and inspect the steering angle sensor.


    B

    INSPECT CAN COMMUNICATION SYSTEM Click here

    C

    REPAIR CIRCUIT INDICATED BY OUTPUT DTC Click here

    A

  2. INSPECT STEERING ANGLE SENSOR (POWER SOURCE TERMINAL)


    1. A0160GCE11

      Turn the engine switch off.

    2. Remove the steering wheel and the column cover lower.

    3. Make sure that there is no looseness at the locking part and the connecting part of the connector.

    4. Disconnect the steering angle sensor connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      J23-1 (IG1) - Body ground Engine switch on (IG) 11 to 14 V
      J23-3 (BAT) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

    OK

  3. INSPECT STEERING ANGLE SENSOR (GROUND TERMINAL)


    1. A0160GCE12

      Turn the engine switch off.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      J23-2 (ESS) - Body ground Always Below 1 Ω

      Tech Tips

      If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step Click here.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT)

    OK

    REPLACE STEERING ANGLE SENSOR Click here