POWER STEERING SYSTEM, Diagnostic DTC:C1551

DTC Code DTC Name
C1551 IG Power Supply Voltage Malfunction

DESCRIPTION

The power steering ECU assembly distinguishes the ignition switch status as ON or off through the IG power source circuit.

DTC No. DTC Detection Condition Trouble Area
C1551 Open or short in IG power source circuit with ignition switch ON.

  • ECU-IG NO. 2 fuse

  • IG power source circuit

  • Power steering ECU assembly

WIRING DIAGRAM

B0045I3E02

CAUTION / NOTICE / HINT

Note


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

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

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (IG POWER SUPPLY)


    1. Turn the ignition switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the tester on.

    5. Enter the following menus: Chassis / EMPS / Data List.

    6. Select the item IG Power Supply in the Data List and read the value displayed on the tester.

      EMPS
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      IG power supply

      ECU power source voltage/

      Min.: 0.0000 V

      Max.: 20.1531 V

      		 11 to 14 V Ignition switch is ON

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

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


    1. B0045ZHE01
      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
      F6-1 (IG) - Body ground Ignition switch ON 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A42-2 (PGND) - Body ground Always Below 1 Ω
      Result
      Result Proceed to
      NG (w/o Stop and Start System) A
      NG (except IG circuit) (w/ Stop and Start System)
      NG (for IG circuit) (w/ Stop and Start System)) B
      OK (for LHD) C
      OK (for RHD) D

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    B

    GO TO STOP AND START SYSTEM Click here

    C

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    D

    REPLACE POWER STEERING ECU ASSEMBLY Click here