POWER STEERING SYSTEM, Diagnostic DTC:C1522, C1523, C1524, C1555

DTC Code DTC Name
C1522 Motor Circuit Malfunction
C1523 Motor Circuit Malfunction
C1524 Motor Circuit Malfunction
C1555 Motor Relay Welding Failure

DESCRIPTION

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

DTC Code DTC Detection Condition Trouble Area
C1522 A motor current sensor malfunction.

  • Steering column assembly

  • Power steering ECU assembly
C1523 An excessively large current deviation.
C1524 A short or open in the motor circuit or abnormal voltage or current in the motor circuit.
C1555 A motor relay malfunction.

WIRING DIAGRAM

A0056ULE07
*a Power Steering Motor
*b Power Steering ECU

CAUTION / NOTICE / HINT

Note

If the power steering ECU assembly or steering column assembly is replaced, perform rotation angle sensor initialization and torque sensor zero point calibration Click here.

PROCEDURE


  1. CHECK CONNECTOR CONNECTION CONDITION (POWER STEERING MOTOR - POWER STEERING ECU)


    1. A00579UE02
      Text in Illustration
      *1

      Component with harness connected

      (Power Steering ECU)

      Check the connection condition of the z10 power steering motor connector.

      OK
      Power steering motor connector is securely connected and locked to the power steering ECU.

    NG

    CONNECT CONNECTOR SECURELY

    OK

  2. READ VALUE USING INTELLIGENT TESTER (MOTOR VOLTAGE)


    1. Turn the ignition switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Start the engine.

    4. Turn the intelligent tester on.

    5. Enter the following menus: Chassis / EMPS / Data List.

    6. Select the items "Motor Terminal Volt(U)", "Motor Terminal Volt(V)" and "Motor Terminal Volt(W)" in the Data List and read the value displayed on the intelligent tester.

      EMPS
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Motor Terminal Volt(U)

      Motor terminal voltage (U phase)/

      Min.: 0.000 V

      Max.: 98.000 V

      		 Value changes between 4 and 35 V The engine is running and the steering wheel is being turned.
      Motor Terminal Volt(V)

      Motor terminal voltage (V phase)/

      Min.: 0.000 V

      Max.: 98.000 V

      		 Value changes between 4 and 35 V The engine is running and the steering wheel is being turned.
      Motor Terminal Volt(W)

      Motor terminal voltage (W phase)/

      Min.: 0.000 V

      Max.: 98.000 V

      		 Value changes between 4 and 35 V The engine is running and the steering wheel is being turned.
      Result
      Result Proceed to
      During steering operation, value changes between 4 and 35 V. for LHD A
      for RHD B
      During steering operation, voltage is not generated or voltage outside specified range is generated. C

    A

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    B

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    C

    REPLACE STEERING COLUMN ASSEMBLY Click here