ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1231/31

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

DESCRIPTION

The skid control ECU inputs steering angle sensor signals via the CAN communication. When a malfunction occurs in the communication line with the steering angle sensor, DTC U0126/63 (Lost Communication with Steering Angle Sensor Module) is output.

DTC Code INF Code DTC Detection Condition Trouble Area
C1231/31 341 Steering angle sensor stuck malfunction.

  • Steering angle sensor

  • Steering angle sensor circuit

  • Steering angle sensor power supply

  • Skid control ECU
↑ 343 Steering angle sensor malfunction signal is received when data transmission is valid (internal malfunction is detected in sensor self check). Steering angle sensor

WIRING DIAGRAM

A01NFC3E20

INSPECTION PROCEDURE

Tech Tips


  • When U0126/63 is output together with C1231/31, inspect and repair the trouble areas indicated by U0126/63 first Click here.

  • When the speed sensor or the yaw rate and acceleration sensor are malfunctioning, 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 power switch off.

    3. Turn the power 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 the speed of 35 km/h (22 mph) and check that no speed sensor and/or yaw rate and acceleration sensor DTCs are output Click here.

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

      Tech Tips


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

      • If speed sensor and yaw rate and acceleration sensor DTCs are output simultaneously, repair these 2 sensors and inspect the steering angle sensor.


    B

    INSPECT CAN COMMUNICATION SYSTEM Click here

    C

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS Click here

    A

  2. INSPECT STEERING ANGLE SENSOR (POWER SOURCE TERMINAL)


    1. A01NH8SE35
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Steering Angle Sensor)

      Turn the power 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
      F43-5 (IG) - Body ground Power switch on (IG) 11 to 14 V
      F43-6 (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. A01NH8SE36
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Steering Angle Sensor)

      Turn the power switch off.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F43-2 (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 SPIRAL CABLE SUB-ASSEMBLY (STEERING ANGLE SENSOR) Click here