POWER STEERING SYSTEM, Diagnostic DTC:C1551

DTC Code DTC Name
C1551 IG Power Supply Voltage Malfunction

DESCRIPTION

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

DTC No. DTC Detection Condition Trouble Area
C1551 IG power source circuit malfunction inside ECU

  • ECU-IG1 No. 1 fuse

  • IG power source circuit

  • Harness or connector

  • Power steering ECU

WIRING DIAGRAM

A01NE4JE13

INSPECTION PROCEDURE

Note


  • If the power steering ECU has been replaced with a new one, perform the rotation angle sensor initialization and torque sensor zero point calibration 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 power switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the power switch on (IG).

    4. Turn the intelligent 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 intelligent tester.

      EMPS
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      IG Power Supply

      ECU power source voltage/

      Min.: 0 V

      Max.: 20.1531 V

      		 11 to 14 V Power switch on (IG)
      OK
      The normal condition value is displayed on the intelligent tester.

    NG

    CHECK HARNESS AND CONNECTOR (POWER STEERING ECU - BODY GROUND) Click here

    OK

    REPLACE POWER STEERING ECU Click here

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


    1. A01NF09E22
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Power Steering ECU)

      Disconnect the F9 and F10 power steering ECU connectors.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      F9-6 (IG) - Body ground Power switch on (IG) 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F10-2 (PGND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE POWER STEERING ECU Click here