POWER STEERING SYSTEM EPS Warning Light Circuit

DESCRIPTION

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

WIRING DIAGRAM

A0117DKE01

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the tester on.

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

    5. In accordance with the display on the tester, read the Data List.

      EMPS
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Battery Voltage Lo Record

      Battery voltage reduction history

      Minimum: 0 times, Maximum: 65535 times

      		 0 times -
      OK
      "Battery Voltage Lo Record" is 0 times.
      Result
      Result Proceed to
      OK A
      NG (for 1KR-FE engine) B
      NG (for 1NR-FE engine) C
      NG (for 1ND-TV engine) D

    B

    GO TO CHARGING SYSTEM Click here

    C

    GO TO CHARGING SYSTEM Click here

    D

    GO TO CHARGING SYSTEM Click here

    A

  2. CHECK CAN COMMUNICATION SYSTEM


    1. Using the intelligent tester, check for DTCs and confirm that there are no problems in the CAN communication system Click here.

      OK
      DTCs are not output.

    NG

    GO TO CAN COMMUNICATION SYSTEM Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (STEERING COLUMN ASSEMBLY - BATTERY AND BODY GROUND)


    1. A011A9PE01
      Text in Illustration
      *1

      Front view of wire harness connector:

      (to Steering Column Assembly (Power Steering ECU))

      Disconnect the connectors from the steering column assembly (power steering ECU).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      D51-5 (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
      A15-2 (PGND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. REPLACE STEERING COLUMN ASSEMBLY


    1. Replace the steering column assembly Click here.


    NEXT

  5. PERFORM ASSIST MAP WRITING


    1. Perform assist map writing Click here.


    NEXT

  6. CHECK EPS WARNING LIGHT (COMBINATION METER)


    1. Check that the EPS warning light operation for engine start.

      OK
      The EPS warning light operates normally.

    NG

    REPLACE COMBINATION METER Click here

    OK

    END