VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1231

DTC Code DTC Name
C1231 Steering Angle Sensor

DESCRIPTION

The steering sensor signal is sent to the skid control ECU (brake actuator assembly) via the CAN communication system. When there is a malfunction in the CAN communication system, it will be detected by the steering sensor zero point malfunction diagnostic function.

DTC Code DTC Detection Condition Trouble Area
C1231 When the +BS terminal voltage is between 9.6 and 16.5 V, the steering sensor malfunction signal is received.

  • Steering sensor

  • Steering sensor circuit

  • Steering sensor power supply

WIRING DIAGRAM

A004JURE03
*a from IG1 Circuit
*b Skid Control ECU (Brake Actuator Assembly)
*c Steering Sensor
*d CAN Communication Line

CAUTION / NOTICE / HINT

Note


  • When replacing the steering sensor, perform VSC sensor neutral memorization Click here.

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Tech Tips


  • When DTC U0073 and/or U0126 is output together with DTC C1231, inspect and repair the trouble areas indicated by DTC U0073 and/or U0126 first Click here.

  • When the speed sensor or the yaw rate sensor has trouble, DTCs for the steering sensor may be output even when the steering sensor is normal. When DTCs for the speed sensor or yaw rate sensor assembly are output together with this steering sensor DTC, inspect and repair the speed sensor and yaw rate sensor assembly first, and then inspect and repair the steering sensor.

PROCEDURE


  1. CHECK DTC


    1. Clear the DTCs Click here.

    2. Turn the ignition switch off.

    3. Turn the ignition switch to ON again and check that no CAN communication system DTC is output.

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

      Result
      Result Proceed to
      No CAN communication system, speed sensor or yaw rate sensor DTC is 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 yaw rate sensor, an abnormal value may be output although the steering sensor is normal.

      • If speed sensor and yaw rate sensor assembly DTCs are output together with this steering sensor DTC, inspect and repair the speed and yaw rate sensors first, and then inspect and repair the steering sensor.


    B

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    C

    REPAIR CIRCUIT INDICATED BY OUTPUT DTC Click here

    A

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)


    1. Turn the ignition switch off.

    2. Disconnect the steering sensor connector.

    3. A004JBXE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Steering Sensor)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      D56-4 (IG) - Body ground Ignition switch ON 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

    OK

  3. CHECK HARNESS AND CONNECTOR (GROUND TERMINAL)


    1. Turn the ignition switch off.

    2. Disconnect the steering sensor connector.

    3. A004IHGE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Steering Sensor)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D56-1 (ESS) - Body ground Always Below 1 Ω

    OK

    REPLACE STEERING SENSOR Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT)