POWER STEERING SYSTEM, Diagnostic DTC:C1524, C1555

DTC Code DTC Name
C1524 Motor Circuit Malfunction
C1555 Motor Relay Welding Failure

DESCRIPTION

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

DTC No. DTC Detection Condition Trouble Area
C1524 Short (or open) in motor circuit or abnormal voltage or current in motor circuit.

  • Power steering motor assembly

  • Power steering ECU assembly
C1555 Motor relay circuit malfunction.

  • Power steering motor assembly

  • Power steering ECU assembly

WIRING DIAGRAM

A01VM7TE01
*a Power Steering Motor Assembly
*b Battery
*c Power Steering ECU Assembly

CAUTION / NOTICE / HINT

Note


  • If the power steering ECU assembly or power steering motor assembly has been replaced, perform the torque sensor zero point calibration and assist map writing Click here.

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

PROCEDURE


  1. CHECK POWER STEERING ECU ASSEMBLY


    1. A01VFT5E01
      Text in Illustration
      *a

      Component with harness connected

      (Power Steering ECU Assembly)

      Start the engine.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      z15-1 (M1) - A42-2 (PGND)

      Engine running

      Steering wheel turned to right

      		 11 to 14 V

      Engine running

      steering wheel turned to left

      		 6 to 11 V
      z15-2 (M2) - A42-2 (PGND)

      Engine running

      Steering wheel turned to right

      		 6 to 11 V

      Engine running

      steering wheel turned to left

      		 11 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (POWER STEERING ECU ASSEMBLY - BATTERY AND BODY GROUND) Click here

    OK

  2. INSPECT POWER STEERING MOTOR ASSEMBLY


    1. A01VKT7E01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Steering ECU Assembly)

      Disconnect the power steering ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      z15-1 (M1) - z15-2 (M2) Always 0.1 to 1.0 Ω
      z15-1 (M1) - Body ground Always 1 MΩ or higher
      z15-2 (M2) - Body ground Always 1 MΩ or higher
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    B

    REPLACE POWER STEERING MOTOR ASSEMBLY Click here

    C

    REPLACE POWER STEERING MOTOR ASSEMBLY Click here

    A

  3. CHECK HARNESS AND CONNECTOR (POWER STEERING ECU ASSEMBLY - BATTERY AND BODY GROUND)


    1. A01VJFCE01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Steering ECU Assembly)

      Disconnect the power steering ECU assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A42-1 (PIG) - Body ground Always 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A42-2 (PGND) - Body ground Always Below 1 Ω
      Result
      Result Proceed to
      NG A
      OK (for LHD) B
      OK (for RHD) C

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    B

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    C

    REPLACE POWER STEERING ECU ASSEMBLY Click here