POWER STEERING SYSTEM, Diagnostic DTC:C1553

DTC Code DTC Name
C1553 PIG Power Supply Overvoltage

DESCRIPTION

If the power steering ECU assembly determines that the motor power source voltage and the IG voltage are not within the specified range, it stops the power assist as a fail-safe function.

DTC No. DTC Detection Condition Trouble Area
C1553

  • PIG power source overvoltage

  • IG power source overvoltage

  • IG and PIG power source circuits

  • Power steering ECU assembly

WIRING DIAGRAM

A01V1AXE21
*a from Auxiliary Batterry
*b from IG1 No. 1 Relay
*c ECU-IG No. 2
*d Power Steering ECU Assembly

CAUTION / NOTICE / HINT

Note


  • If the power steering ECU assembly has been replaced with a new one, perform assist map writing and the torque sensor zero point calibration Click here.

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

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (IG)


    1. A01V053E02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Steering ECU Assembly)

      Disconnect the power steering ECU assembly connectors.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      F5-1 (IG) - A24-2 (PGND) Ignition switch ON (IG) 9 to 16 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK HARNESS AND CONNECTOR (POWER STEERING ECU ASSEMBLY - BODY GROUND)


    1. A01UZC3E01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Steering ECU Assembly)

      Disconnect the power steering ECU assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A24-1 (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
      A24-2 (PGND) - Body ground Always Below 1 Ω
      Result
      Result Proceed to
      NG A
      OK (for LHD) B
      OK (for RHD) C

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    B

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    C

    REPLACE POWER STEERING ECU ASSEMBLY Click here