POWER STEERING SYSTEM PS Warning Light Remains ON

DESCRIPTION

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

When the power supply voltage to the power steering ECU assembly (terminals IG) drops, required steering effort increases and the P/S warning light turns on.

WIRING DIAGRAM

A005JE4E03

CAUTION / NOTICE / HINT

Note


  • If the power steering ECU assembly is replaced, perform the torque sensor zero point calibration Click here.

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

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 assembly 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. CONFIRM DTC (CAN COMMUNICATION SYSTEM)


    1. Check for DTCs Click here.

      OK
      DTC is not output.

    NG

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    OK

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


    1. A005GVCE01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Steering ECU Assembly)

      Disconnect the A42 and F6 power steering ECU assembly connectors.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      F6-1 (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
      A42-2 (PGND) - Body ground Always Below 1 Ω
      Result
      Result Proceed to
      OK A
      NG (w/ Stop and Start System) B
      NG (w/o Stop and Start System) C

    B

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    C

    GO TO STOP AND START SYSTEM Click here

    A

  4. REPLACE POWER STEERING ECU ASSEMBLY


    1. Replace the power steering ECU assembly.

      Tech Tips



    NEXT

  5. PERFORM ASSIST MAP WRITING


    NEXT

  6. CHECK P/S WARNING LIGHT


    1. Check that the P/S warning light on the combination meter assembly does not come on.

      OK
      The P/S warning light on the combination meter assembly does not come on.

    OK

    END

    NG

    REPLACE COMBINATION METER ASSEMBLY Click here