POWER STEERING SYSTEM (for 2AR without Wireless Door Lock), Diagnostic DTC:C1524, C1555

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

DESCRIPTION

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

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

  • Power steering motor assembly

  • Power steering ECU assembly
C1555 Predriver (Motor relay circuit) malfunction

WIRING DIAGRAM

A011V1WE01

INSPECTION PROCEDURE

Note

If the power steering ECU assembly has been replaced with a new one, perform assist map writing and torque sensor zero point calibration Click here.

Tech Tips

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

PROCEDURE

  1. CHECK POWER STEERING ECU ASSEMBLY

    1. Start the engine.

      A011UMEE03

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

      Standard Voltage
      Tester Connection

      Condition

      (Steering Wheel Position)

      		 Specified Condition
      z18-1 (M1) - Body ground

      Engine running

      (Turned to right)

      		 Below 1 V
      z18-1 (M1) - Body ground

      Engine running

      (Turned to left)

      		 9 to 16 V
      z18-2 (M2) - Body ground

      Engine running

      (Turned to right)

      		 9 to 16 V
      z18-2 (M2) - Body ground

      Engine running

      (Turned to left)

      		 Below 1 V
      Text in Illustration
      *a

      Component with harness connected

      (Power Steering ECU Assembly)
    NG

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    OK

  2. CHECK POWER STEERING MOTOR ASSEMBLY

    1. Disconnect the connector from the power steering ECU assembly.

      A011SEXE03

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      z18-1 (M1) - z18-2 (M2) Always 0.08 to 0.15 Ω
      z18-1 (M1) - Body ground Always 1 MΩ or higher
      z18-2 (M2) - Body ground Always 1 MΩ or higher
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Power Steering ECU Assembly)
    NG

    REPLACE POWER STEERING MOTOR ASSEMBLY Click here

    OK

    REPLACE POWER STEERING ECU ASSEMBLY Click here