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 Code Detection Condition Trouble Area
C1568 Power steering converter inner circuit malfunction

  • Harness or connector

  • Power steering converter assembly

  • Active stabilizer suspension system

WIRING DIAGRAM

A000ZHHE02
*a from Auxiliary Battery
*b from IG Circuit
*c Power Steering Converter Assembly
*d Power Steering ECU

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (POWER STEERING CONVERTER PIG POWER SUPPLY)


    1. A00102GE02
      *1 Front view of wire harness connector: (to Power Steering Converter)

      Disconnect the n2 power steering converter connector.

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

      Standard voltage
      Tester Connection Condition Specified Condition
      n2-1 (PIG) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

  2. CHECK HARNESS AND CONNECTOR (POWER STEERING CONVERTER IG POWER SUPPLY)


    1. A000U3WE02
      *1 Front view of wire harness connector: (to Power Steering Converter)

      Disconnect the n1 power steering converter connector.

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      n1-5 (IG) - Body ground Power switch ON (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (POWER STEERING ECU PIG POWER SUPPLY)


    1. Disconnect the A44 power steering ECU connector.

    2. Disconnect the n3 power steering converter connector.

      A000Z6QE01
      *1 Front view of wire harness connector: (to Power Steering ECU)
      *2 Front view of wire harness connector: (to Power Steering Converter)

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

      Standard resistance
      Tester Connection Condition Specified Condition
      A44-4 (PIG) - n3-1 (VOT1) Always Below 1 Ω
      A44-5 (PGND) - Body ground
      A44-4 (PIG) or n3-1 (VOT1) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS AND 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

    A

    REPLACE POWER STEERING CONVERTER ASSEMBLY Click here

    B

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