POWER STEERING SYSTEM, Diagnostic DTC:C1551

DTC Code DTC Name
C1551 IG Power Supply Voltage

DESCRIPTION

The power steering ECU assembly distinguishes the power switch status as on (IG) or off through the IG power source circuit.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Return-to-normal Condition Note
C1551 IG Power Supply Voltage Open or short in IG power source circuit with power switch on (IG)

  • EPS-IG1 fuse

  • IG power source circuit

  • Power steering ECU assembly

 EPS warning light: Comes on The ECU judges the system has returned to normal or the power switch is turned on (IG) again -

WIRING DIAGRAM

B004OQAE06
*a from IG1-NO. 1 Relay
*b Power Steering ECU Assembly

CAUTION / NOTICE / HINT

Note


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

    Click here

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

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (AUXILIARY BATTERY - POWER STEERING ECU ASSEMBLY)


    1. Disconnect the F54 and F20 power steering ECU assembly connectors.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      F20-1 (IG) - Body ground Power switch on (IG) 8 to 16 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F54-2 (PGND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POWER STEERING ECU ASSEMBLY for LHD: Click here
    REPLACE POWER STEERING ECU ASSEMBLY for RHD: Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR