POWER STEERING SYSTEM, Diagnostic DTC:C1568

DTC Code DTC Name
C1568 DC-DC Converter Malfunction

DESCRIPTION

As a fail-safe function, when the power steering converter assembly is malfunctioning, power assistance is limited/stopped.

DTC No. DTC Detection Condition Trouble Area
C1568 Power steering converter inner circuit malfunction

  • EPS fuse

  • ECU-IG1 No. 1 fuse

  • Harness or connector

  • Power steering converter assembly

  • Active stabilizer suspension system

WIRING DIAGRAM

A01NHF1E01

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (POWER STEERING CONVERTER - BATTERY)


    1. A01NGUEE04
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Power Steering Converter Assembly)

      Disconnect the g8 power steering converter assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      g8-1 (PIG) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK HARNESS AND CONNECTOR (POWER STEERING CONVERTER - BATTERY)


    1. A01NHFSE04
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Power Steering Converter Assembly)

      Disconnect the F101 power steering converter assembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      F101-5 (IG) - Body ground Power switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A01NDJ8E01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Power Steering ECU)
      *2

      Front view of wire harness connector

      (to Power Steering Converter Assembly)

      Disconnect the F10 power steering ECU connector.

    2. Disconnect the F100 power steering converter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F10-1 (PIG) - F100-1 (VOT1) Always Below 1 Ω
      F10-2 (PGND) - Body ground
      F10-1 (PIG) or F100-1 (VOT1) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK POWER STEERING SYSTEM (OPERATION)


    1. Turn the power switch on (READY) and check whether the power assistance operates.

      Result
      Result Proceed to
      Power assistance does not operate, or power assistance operates on vehicle not equipped with active stabilizer suspension system A
      Power assistance operates on vehicle equipped with active stabilizer suspension system B

    B

    GO TO ACTIVE STABILIZER SUSPENSION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    A

    REPLACE POWER STEERING CONVERTER ASSEMBLY Click here