POWER STEERING SYSTEM (w/ VSC), Diagnostic DTC:C1531

DTC Code DTC Name
C1531 ECU Malfunction

DESCRIPTION

This circuit supplies electric power to the power steering solenoid valve.

The power steering ECU controls the output current to the power steering solenoid valve in accordance with the steering angle signal, steering zero point memory, vehicle speed signal and engine speed signal, adjusting the amount of power steering assist.

DTC Code DTC Detection Condition Trouble area
C1531 A short or open in the solenoid valve circuit

  • Harness or connector

  • Vane pump assembly

  • Power steering ECU assembly

WIRING DIAGRAM

A00JXWUE04

INSPECTION PROCEDURE

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (SOLENOID CURRENT)


    1. Turn the ignition switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the intelligent tester on.

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

      PPS
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Solenoid Current

      Solenoid Current/

      Min.: 0 mA

      Max.: 1000 mA

      		 200 to 950 mA The engine is running and the steering wheel is being turned.
      OK
      The normal condition value is displayed the intelligent tester.

    NG

    CHECK HARNESS AND CONNECTOR (POWER STEERING ECU - POWER STEERING SOLENOID VALVE) Click here

    OK

    REPLACE POWER STEERING ECU ASSEMBLY Click here

  2. CHECK HARNESS AND CONNECTOR (POWER STEERING ECU - POWER STEERING SOLENOID VALVE)


    1. Disconnect the power steering ECU and power steering solenoid valve connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G46-7 (SOF+) - C38-2 (SOF+) Always Below 1 Ω
      G46-8 (SOF-) - C38-1 (SOF-)
      G46-7 (SOF+) - Body ground Always 10 kΩ or higher
      G46-8 (SOF-) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT POWER STEERING SOLENOID VALVE ASSEMBLY

    A00JZA2E05
    Text in Illustration
    *a

    Component without harness connected

    (Power Steering Solenoid Valve)

    1. Disconnect the power steering solenoid valve connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 (SOF-) - 2 (SOF+) 20°C (68°F) 6.7 to 7.3 Ω

    3. Connect the battery positive (+) lead with a 21 W bulb to terminal 2 (SOF+) and the negative (-) lead to terminal 1 (SOF-) of the solenoid valve connector. Then check that the valve moves and makes an operating noise.

      OK
      Valve moves and makes an operating noise.
      Result
      Result Proceed to
      OK A
      NG (for 1GR-FE) B
      NG (for 1KD-FTV) C
      NG (for 2TR-FE) D

    B

    REPLACE VANE PUMP ASSEMBLY Click here

    C

    REPLACE VANE PUMP ASSEMBLY Click here

    D

    REPLACE VANE PUMP ASSEMBLY Click here

    A

    REPLACE POWER STEERING ECU ASSEMBLY Click here