POWER STEERING SYSTEM (w/ VSC) Power Steering Warning Light Circuit

DESCRIPTION

The power steering ECU is connected to the combination meter via CAN communication. If the power steering ECU detects a malfunction, the power steering warning light comes on. At this time, the vehicle enters fail-safe mode.

WIRING DIAGRAM

A00O568E02

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. INSPECT CAN COMMUNICATION SYSTEM


    1. Check for DTCs of the CAN communication system.

      for LHD with Entry and Start System:

      Refer to the following procedures Click here.

      for LHD without Entry and Start System:

      Refer to the following procedures Click here.

      for RHD with Entry and Start System:

      Refer to the following procedures Click here.

      for RHD without Entry and Start System:

      Refer to the following procedures Click here.

      Result
      Result Proceed to
      DTC is not output. A
      DTC is output. for LHD with Entry and Start System B
      for LHD without Entry and Start System C
      for RHD with Entry and Start System D
      for RHD without Entry and Start System E

    B

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

    C

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

    D

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

    E

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

    A

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


    1. A00O3U5E01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Power Steering ECU)

      Disconnect the power steering ECU connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      G46-5 (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
      G46-3 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (METER/GAUGE SYSTEM)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON and turn the intelligent tester on.

    3. Perform the Active Test of the combination meter using the intelligent tester Click here.

      Combination Meter
      Tester Display Test Part Control Range Diagnostic Note
      PPS Indicator Power steering warning light ON or OFF Perform the test with the vehicle stopped and the engine idling.

    4. Check that the power steering warning light operates in accordance with the Active Test.

      Tech Tips

      Reconnect the connectors and restore the vehicle to its previous condition before checking the combination meter.

      OK
      The power steering warning light turns on and off in accordance with the intelligent tester operation.

    NG

    INSPECT METER/GAUGE SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    OK

    REPLACE POWER STEERING ECU ASSEMBLY Click here