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.

  • Steering column assembly (Power steering motor)

  • Power steering ECU assembly
C1555 Motor relay circuit malfunction.

  • Steering column assembly (Power steering motor)

  • Power steering ECU assembly

WIRING DIAGRAM

A005LJXE05
*a POWER STEERING MOTOR
*b STEERING COLUMN ASSEMBLY
*c BATTERY
*d POWER STEERING ECU ASSEMBLY

CAUTION / NOTICE / HINT

Note


  • If the power steering ECU assembly or steering column assembly has been replaced, perform the torque sensor zero point calibration Click here.

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

PROCEDURE


  1. INSPECT POWER STEERING ECU ASSEMBLY


    1. A005HSDE01
      Text in Illustration
      *a

      Component with harness connected

      (Power Steering ECU Assembly)

      Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      z5-1 (M1) - A42-2 (PGND)

      Ignition switch ON

      Steering wheel turned to right

      		 11 to 14 V

      Ignition switch ON

      steering wheel turned to left

      		 6 to 11 V
      z5-2 (M2) - A42-2 (PGND)

      Ignition switch ON

      Steering wheel turned to right

      		 6 to 11 V

      Ignition switch ON

      steering wheel turned to left

      		 11 to 14 V

    NG

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

    OK

  2. INSPECT STEERING COLUMN ASSEMBLY (POWER STEERING MOTOR)


    1. A005HA9E01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Steering ECU Assembly)

      Disconnect the z5 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
      z5-1 (M1) - z5-2 (M2) Always 0.08 to 0.15 Ω
      z5-1 (M1) - Body ground Always 1 MΩ or higher
      z5-2 (M2) - Body ground Always 1 MΩ or higher
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    B

    REPLACE STEERING COLUMN ASSEMBLY Click here

    C

    REPLACE STEERING COLUMN ASSEMBLY Click here

    A

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


    1. A005IHNE01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Steering ECU Assembly)

      Disconnect the A42 power steering ECU assembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A42-1 (PIG) - Body ground Ignition switch ON 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
      OK A
      NG (for LHD) B
      NG (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