POWER STEERING SYSTEM, Diagnostic DTC:C1551

DTC Code DTC Name
C1551 IG Power Supply Voltage Malfunction

DESCRIPTION

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

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

  • ECU-IG No. 2 fuse

  • IG power source circuit

  • Power steering ECU

WIRING DIAGRAM

A01EL43E12

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.

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

PROCEDURE


  1. READ VALUE USING GTS (IG POWER SUPPLY)


    1. Turn the ignition switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the GTS on.

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

    6. Select the items "IG Power Supply" in the Data List and read the value displayed on the GTS.

      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 Ignition switch ON
      OK
      Normal condition value is displayed the GTS.

    NG

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

    OK

    REPLACE POWER STEERING ECU Click here

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


    1. A01EIRVE21
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Power Steering ECU)

      Disconnect the connectors from the power steering ECU.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      D20-6 (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
      D19-2 (PGND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE POWER STEERING ECU Click here