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-IG No. 1 fuse

  • IG power source circuit

  • Power steering ECU

WIRING DIAGRAM

A003RY9E31

INSPECTION PROCEDURE

Note

If the steering column assembly or power steering ECU has been replaced, perform the rotation angle sensor value initialization and torque sensor zero point calibration Click here.

Tech Tips

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

      IG power supply/

      Min.: 0 V

      Max.: 20.1531 V

      		 9 to 16 V Power switch on (IG)
      OK
      The normal condition value is displayed on the intelligent tester.

    NG

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

    OK

    CHECK INTERMITTENT PROBLEMS

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


    1. 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
      E32-6 (IG) - Body ground Power switch on (IG) 9 to 16 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A75-2 (PGND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE POWER STEERING ECU Click here