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POWER STEERING SYSTEM EPS Warning Light Circuit

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DTC Code DTC Name
  EPS Warning Light Circuit
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DESCRIPTION

The following describes the troubleshooting for when DTC output is normal and the EPS warning light remains on after the power switch is turned on (READY).

Tip:

  • If the power steering ECU (rack and pinion power steering gear assembly) detects a malfunction in the power source voltage input (IG) circuit, the EPS warning light illuminates.

  • If the power steering ECU (rack and pinion power steering gear assembly) detects a drop in the power voltage input (IG and PIG) circuit, and there is the risk of steering force increasing, the EPS warning light turns on in order to warn the driver.

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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

  • If the rack and pinion power steering gear assembly has been replaced, perform assist map writing and torque sensor zero point calibration.

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

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PROCEDURE


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    CHECK HARNESS AND CONNECTOR


    1. Jiggle the rack and pinion power steering gear assembly connectors and wire harness up and down, and left and right to check the illumination condition of the EPS warning light in the combination meter assembly.

      OK
      The EPS warning light illumination condition does not change.
      Tip:

      When the EPS warning light is operating properly, it illuminates when the power switch is turned on (IG) and turns off when the power switch is turn on (READY).

      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

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    CHECK CAN COMMUNICATION SYSTEM


    1. Check for DTCs.

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      Result
      Result Proceed to
      CAN communication system DTCs are not output A
      CAN communication system DTCs are output B

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    CHECK HARNESS AND CONNECTOR (IG POWER SUPPLY - GROUND)


    1. Disconnect the B1 rack and pinion power steering gear assembly connectors.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      B1-4 (IG) - Body ground Power switch on (IG) 8 to 16 V
      B1-8 (PIG) - Body ground Always 9 to 16 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B1-7 (PGND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

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    INSPECT COMBINATION METER ASSEMBLY


    1. Perform the Active Test of the combination meter assembly using the GTS.

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      1. for Sport Package:


        1. Body Electrical > Combination Meter > Active Test
          Tester Display
          EPS Warning




        OK
        The EPS warning light turns on or off in accordance with the GTS operation.

      2. except Sport Package:


        1. Body Electrical > Combination Meter > Active Test
          Tester Display
          Multi Display Default Screen




        OK
        The multi-information display in the combination meter assembly changes according to the GTS operation.
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE RACK AND PINION POWER STEERING GEAR ASSEMBLY for 2WD:Click here

      REPLACE RACK AND PINION POWER STEERING GEAR ASSEMBLY for AWD:Click here

    • NG

      GO TO METER / GAUGE SYSTEMClick here