POWER STEERING SYSTEM PS Warning Light Remains ON

DESCRIPTION

If the power steering ECU detects a malfunction, the P/S warning light comes on. At this time, the power steering ECU stores a DTC in its memory.

WIRING DIAGRAM


  1. w/ Smart Entry and Start System

    A01EKDXE01

  2. w/o Smart Entry and Start System

    A01EMJME01

INSPECTION PROCEDURE

Note

If the power steering ECU has been replaced with a new one, perform the rotation angle sensor initialization and torque sensor zero point calibration Click here.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR


    1. Turn the ignition switch to ON.

    2. Check the indication condition of the P/S warning light by wiggling the power steering ECU connector and wire harness up and down, and right and left.

      OK
      P/S warning light indication condition does not change.

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK FOR DTC (CAN COMMUNICATION SYSTEM)


    1. Check for DTCs Click here.

      OK
      DTC is not output.

    NG

    GO TO CAN COMMUNICATION SYSTEM Click here

    OK

  3. READ VALUE USING GTS (IG POWER SUPPLY)


    1. Turn the ignition switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the GTS on.

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

    6. Select the items "IG Power Supply" in the Data List and read the value displayed on the GTS.

      EMPS
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      IG Power Supply

      ECU power source voltage/

      Min.: 0 V

      Max.: 20.1531 V

      		 11 to 14 V Ignition switch ON
      OK
      Normal condition value is displayed the GTS.

    NG

    INSPECT CHARGING SYSTEM Click here

    OK

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


    1. A01EIRVE21
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Power Steering ECU)

      Disconnect the connectors from the power steering ECU.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      D20-6 (IG) - 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
      D19-2 (PGND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. REPLACE POWER STEERING ECU


    1. Replace the power steering ECU Click here.

    2. Check the P/S warning light condition.

      OK
      P/S warning light remains on when the ignition switch is ON and goes off after engine start.

    NG

    GO TO METER / GAUGE SYSTEM Click here

    OK

    END