POWER STEERING SYSTEM, Diagnostic DTC:C1551

DTC Code DTC Name
C1551 IG Power Supply Voltage

DESCRIPTION

The power steering ECU assembly distinguishes the engine 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 engine switch on (IG)

  • 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

B006RLXE01
*a from Stop and Start System
*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

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (IG)


    1. B006QOSC01
      *a

      Front view of wire harness connector

      (to Power Steering ECU Assembly)

      Disconnect the G20 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
      G20-1 (IG) - Body ground Engine switch on (IG) 10.5 to 16 V
      Result
      Proceed to
      OK
      NG

    NG

    GO TO STOP AND START SYSTEM (Backup Boost Converter Circuit) for 2AR-FE: Click here
    GO TO STOP AND START SYSTEM (Backup Boost Converter Circuit) for 2GR-FKS: Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (PGND)


    1. B006NYNC16
      *a

      Front view of wire harness connector

      (to Power Steering ECU Assembly)

      Disconnect the G53 power steering ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G53-2 (PGND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER STEERING ECU ASSEMBLY - BODY GROUND)