POWER STEERING SYSTEM (for 2AR-FSE), Diagnostic DTC:C1521/24, C1522/24, C1523/24, C1524/24, C1532/25

DTC Code DTC Name
C1521/24 Short in Motor Circuit
C1522/24 Power Supply Sensor
C1523/24 Current Deviation Excessive
C1524/24 Motor Terminal Voltage Malfunction
C1532/25 ECU Malfunction

DESCRIPTION

The power steering ECU assembly supplies current to the power steering motor.

DTC Code DTC Detection Condition Trouble Area
C1521/24 Motor overcurrent.

  • Harness or connector

  • Power steering motor (built into power steering link assembly)

  • Power steering ECU assembly
C1522/24 A motor current sensor malfunction.

  • Harness or connector

  • Power steering motor (built into power steering link assembly)

  • Power steering ECU assembly
C1523/24 Excessively large current deviation.

  • Harness or connector

  • Power steering motor (built into power steering link assembly)

  • Power steering ECU assembly
C1524/24 A voltage error between the motor terminals.

  • Harness or connector

  • Power steering motor (built into power steering link assembly)

  • Power steering ECU assembly
C1532/25 An ECU malfunction (peripheral circuit malfunction).

  • Harness or connector

  • Power steering motor (built into power steering link assembly)

  • Power steering ECU assembly

WIRING DIAGRAM

A01FTC6E05

INSPECTION PROCEDURE

Note


  • If the power steering ECU assembly is replaced with a new one, perform assist map writing, clear the motor rotation angle sensor calibration value, initialize the motor rotation angle sensor value and calibrate the torque sensor zero point Click here.

  • If the power steering link assembly is replaced, clear the motor rotation angle sensor calibration value, initialize the motor rotation angle sensor value and calibrate the torque sensor zero point Click here.

PROCEDURE


  1. RECONFIRM DTC


    1. Check for DTCs Click here.

      Result
      Result Proceed to
      Only DTC C1521/24, C1522/24, C1523/24, C1524/24 or 1532/25 is output A
      DTC C1555/25 is output together with other DTCs B

      Tech Tips

      If DTC C1555/25 is output, perform troubleshooting for C1555/25 first.


    B

    GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

    A

  2. CHECK CONNECTORS


    1. Check the connection of the power steering ECU assembly and power steering link assembly connectors.

    2. Visually inspect the terminals of the power steering ECU assembly and power steering link assembly connectors.

      Result

      Result

      Proceed to
      Normal A
      Connectors not properly connected B
      Power steering ECU assembly connector terminals abnormal C
      Power steering link assembly connector terminals abnormal D

    B

    CONNECT CONNECTORS CORRECTLY

    C

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    D

    REPLACE POWER STEERING LINK ASSEMBLY Click here

    A

  3. CHECK HARNESS AND CONNECTOR (POWER STEERING ECU ASSEMBLY - POWER STEERING MOTOR)


    1. Disconnect the C8 power steering ECU assembly connector.

    2. Disconnect the C1 power steering motor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C1-1 (W) - C8-2 (W) Always Below 1 Ω
      C1-2 (V) - C8-1 (V) Always Below 1 Ω
      C1-3 (U) - C8-3 (U) Always Below 1 Ω
      C1-1 (W) or C8-2 (W) - Body ground Always 10 kΩ or higher
      C1-2 (V) or C8-1 (V) - Body ground Always 10 kΩ or higher
      C1-3 (U) or C8-3 (U) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT POWER STEERING LINK ASSEMBLY (POWER STEERING MOTOR)


    1. Disconnect the C1 power steering motor connector.

    2. A01FVQ5E01
      Text in Illustration
      *1 Power steering link assembly
      *a Area to set negative probe
      *b

      Component without harness connected

      (Power Steering Motor)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 (W) - 3 (U) Always 0.07 to 10 Ω
      2 (V) - 1 (W) Always 0.07 to 10 Ω
      3 (U) - 2 (V) Always 0.07 to 10 Ω
      1 (W) - Body ground* Always 100 kΩ or higher
      2 (V) - Body ground* Always 100 kΩ or higher
      3 (U) - Body ground* Always 100 kΩ or higher

      *: Touch the negative probe to the power steering link assembly housing at the position shown in the illustration to perform the measurement.


    NG

    REPLACE POWER STEERING LINK ASSEMBLY Click here

    OK

    REPLACE POWER STEERING ECU ASSEMBLY Click here