POWER STEERING SYSTEM (for 2GR-FXE) Power Steering Warning Light Circuit

DESCRIPTION

The power steering ECU is connected to the combination meter via CAN communication. If any of the following conditions are detected, the power steering warning light remains on.


WIRING DIAGRAM

A01FQI4E01

INSPECTION PROCEDURE

Note


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

  • If the power steering ECU assembly is replaced with a new one, perform assist map writing, clear the motor rotation angle sensor calibration value, initialize the motor rotation angle sensor value and calibrate the torque sensor zero point Click here.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR


    1. Turn the power switch on (READY).

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

      OK
      The power steering warning light indication condition does not change.

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK CAN COMMUNICATION SYSTEM


    1. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC is not output A
      DTC is output for LHD B
      for RHD C

    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

    A

  3. READ VALUE USING GTS (IG POWER SUPPLY)


    1. Turn the power switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the power switch on (IG).

    4. Turn the GTS on.

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

    6. Select the item "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.: 0.0000 V

      Max.: 20.1531 V

      		 11 to 14 V The power switch is on (IG).
      OK
      Normal condition value is displayed on the GTS.

    NG

    CHECK TERMINAL VOLTAGE (IG) Click here

    OK

  4. REPLACE POWER STEERING ECU ASSEMBLY


    1. Replace the power steering ECU assembly Click here.

    2. Perform assist map writing, clear the motor rotation angle sensor calibration value, initialize the motor rotation angle sensor value and calibrate the torque sensor zero point Click here.

    3. Check the illumination condition of the power steering warning light.

      OK
      The power steering warning light illuminates with the power switch on (IG) and turns off after the power switch turned from ON (IG) to ON (READY).

    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

    OK

    END

  5. CHECK TERMINAL VOLTAGE (IG)


    1. Disconnect the power steering ECU connector.

    2. A01FUH4E07
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Power Steering ECU)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A29-14 (IG) - Body ground Power switch on (IG) 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A29-9 (PGND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE POWER STEERING ECU ASSEMBLY Click here