ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1231/31

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

DESCRIPTION

The skid control ECU (brake booster with master cylinder assembly) receives steering angle sensor (spiral with sensor cable sub-assembly) signals via CAN communication. When a malfunction occurs in the communication line with the steering angle sensor (spiral with sensor cable sub-assembly), DTC U0126/63 (Lost Communication with Steering Angle Sensor Module) is stored.

DTC No.

Detection Item

INF Code

DTC Detection Condition

Trouble Area

Note

C1231/31

Steering Angle Sensor Circuit Malfunction

701

702

703

  • INF Code: 701

    • While steering angle sensor communication is enabled, a malfunction signal output is received during the sensor self-check (sensor malfunction).

  • INF Code: 702

    • While steering angle sensor communication is enabled, a malfunction signal output is received during the sensor self-check (internal malfunction).

  • INF Code: 703

    • While steering angle sensor communication is enabled, a malfunction signal output is received during the sensor self-check (+B malfunction).

Steering angle sensor (Spiral with sensor cable sub-assembly) internal malfunction

VSC DTC

WIRING DIAGRAM

C270521E63

CAUTION / NOTICE / HINT

Note:

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

Tip:

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

    Click here

  • When a speed sensor or yaw rate and acceleration sensor (airbag ECU assembly) is malfunctioning, DTCs for the steering angle sensor (spiral with sensor cable sub-assembly) may be output even when the steering angle sensor (spiral with sensor cable sub-assembly) is normal. When DTCs for a speed sensor or the yaw rate and acceleration sensor (airbag ECU assembly) are output together with DTCs for the steering angle sensor (spiral with sensor cable sub-assembly), inspect and repair the speed sensor and yaw rate and acceleration sensor (airbag ECU assembly) first, and then inspect and repair the steering angle sensor (spiral with sensor cable sub-assembly).

PROCEDURE

  1. CHECK DTC

    1. Clear the DTCs.

      Click here

      Chassis > ABS/VSC/TRC > Clear DTCs

    2. Turn the power switch off.

    3. Turn the power switch on (IG) again and check that no CAN communication system DTCs are output.

      for LHD:Click hereClick hereClick here

      for RHD:Click hereClick hereClick here

    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/or yaw rate and acceleration sensor DTCs are output.

      Click here

      Chassis > ABS/VSC/TRC > Trouble Codes

      Result

      Result

      Proceed to

      DTC C1231/31 is output.

      A

      CAN communication system DTCs are output.

      B

      Speed sensor and/or yaw rate and acceleration sensor DTCs are output.

      C

      DTC C1231/31 is not output.

      D
      Tip:

      • When CAN communication system DTCs are output, repair the CAN communication system before repairing each corresponding sensor.

      • If there is a malfunction in a speed sensor or the yaw rate and acceleration sensor (airbag ECU assembly), an abnormal value may be output even though the steering angle sensor (spiral with sensor cable sub-assembly) is normal.

      • If speed sensor and yaw rate and acceleration sensor DTCs are output simultaneously, repair the sensors and inspect the steering angle sensor (spiral with sensor cable sub-assembly).

    B

    INSPECT CAN COMMUNICATION SYSTEM

    for LHD:Click here

    for RHD:Click here

    C

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS

    Click here

    D

    USE SIMULATION METHOD TO CHECK

    Click hereClick hereClick here

    A

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)

    1. C266564C73

      *a

      Front view of wire harness connector

      (to Steering Angle Sensor (Spiral with Sensor Cable Sub-assembly))

      Turn the power switch off.

    2. Remove the steering wheel and column cover.

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

    4. Disconnect the G12 steering angle sensor (spiral with sensor cable sub-assembly) connector.

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      G12-4 (IG) - Body ground

      Power switch on (IG)

      11 to 14 V

      G12-5 (BAT) - Body ground

      Always

      11 to 14 V

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

    OK

  3. CHECK HARNESS AND CONNECTOR (GROUND TERMINAL)

    1. C266564C11

      *a

      Front view of wire harness connector

      (to Steering Angle Sensor (Spiral with Sensor Cable Sub-assembly))

      Turn the power switch off.

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

      Note:

      Before measuring the resistance of the steering angle sensor (spiral with sensor cable sub-assembly), turn the power switch off and leave the vehicle for 1 minute or more without operating the key, switches or opening or closing the doors.

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G12-1 (ESS) - Body ground

      1 minute after power switch off

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT)