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 No. DTC Detection Condition Trouble Area
C1522 Motor current sensor malfunction
  • Steering column assembly (Power steering motor)

  • Power steering ECU

C1523 Excessively large current deviation
C1524 Short (or open) in motor circuit or abnormal voltage or current in motor circuit
C1555 Motor relay circuit malfunction

WIRING DIAGRAM

A01NFBBE10

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. CHECK CONNECTOR CONNECTION CONDITION


    1. Check the installation condition of the power steering motor connector.

      OK
      The power steering motor connector is securely connected to the power steering ECU.

    NG
    OK
  2. READ VALUE USING INTELLIGENT TESTER (MOTOR TERMINAL VOLTAGE)


    1. Turn the power switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the power switch on (IG).

    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 V

      Max.: 98.000 V

      During steering operation, value changes within 20 to 58 V range The power switch on (READY) and steering wheel is being turned.
      Motor Terminal Volt(V)

      Motor terminal voltage (V phase)/

      Min.: 0 V

      Max.: 98.000 V

      During steering operation, value changes within 20 to 58 V range The power switch on (READY) and steering wheel is being turned.
      Motor Terminal Volt(W)

      Motor terminal voltage (W phase)/

      Min.: 0 V

      Max.: 98.000 V

      During steering operation, value changes within 20 to 58 V range The power switch on (READY) and steering wheel is being turned.
      Result
      Result Proceed to
      During steering operation, value changes within 20 to 58 V range A
      During steering operation, voltage is not generated B

    B
    A