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ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1231/31

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

The skid control ECU inputs steering angle sensor signals via the CAN communication system. 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
C1231/31 701 While steering angle sensor communication is enabled, a malfunction signal output is received during the sensor self-check (sensor malfunction). Steering angle sensor internal malfunction
↑ 702 While steering angle sensor communication is enabled, a malfunction signal output is received during the sensor self-check (internal malfunction). ↑
↑ 703 While steering angle sensor communication is enabled, a malfunction signal output is received during the sensor self-check (+B malfunction). ↑
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WIRING DIAGRAM

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INSPECTION 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 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.

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PROCEDURE


  1. Click here

    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
      DTC (C1231/31) is output A
      CAN communication system DTC is output B
      Speed sensor and/or yaw rate and acceleration sensor DTC is output C
      DTC (C1231/31) is not output D
      Tip:

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

      • 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 two sensors and inspect the steering angle sensor.


  2. Click here

    INSPECT STEERING ANGLE SENSOR (POWER SOURCE TERMINAL)


    1. A003VC8E78

      Turn the power switch off.

    2. Remove the steering wheel and the column cover.

    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
      H29-5 (IG) - Body ground Power switch on (IG) 11 to 14 V
      H29-6 (BAT) - Body ground Always 11 to 14 V
      Table 1. Text in Illustration
      *a

      Front view of wire harness connector

      (to Steering Angle Sensor)

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    INSPECT STEERING ANGLE SENSOR (GROUND TERMINAL)


    1. A003VC8E73

      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
      H29-2 (ESS) - Body ground Always Below 1 Ω
      Table 2. Text in Illustration
      *a

      Front view of wire harness connector

      (to Steering Angle Sensor)
      Tip:

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


  4. Click here

    REPLACE SPIRAL CABLE (STEERING ANGLE SENSOR)Click here

  5. Click here

    INSPECT CAN COMMUNICATION SYSTEMClick here

  6. Click here

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCSClick here

  7. Click here

    CHECK FOR INTERMITTENT PROBLEMSClick here

  8. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

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    REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT)