POWER STEERING SYSTEM, Diagnostic DTC:C1552

DTC Code DTC Name
C1552 PIG Power Supply Voltage Malfunction

DESCRIPTION

The power steering converter assembly steps down the HV battery voltage to approximately 46 V. This voltage is then supplied to the power steering ECU to operate the motors. As a fail-safe function, when the PIG power supply and power steering converter assembly are malfunctioning, power assistance is limited/stopped.

DTC No. DTC Detection Condition Trouble Area
C1552 PIG power source circuit malfunction inside ECU

  • EPS fuse

  • ECU-IG1 No. 1 fuse

  • PIG power source circuit

  • Harness or connector

  • Power steering converter assembly

  • Power steering ECU

WIRING DIAGRAM

A01NHF1E01

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 (MOTOR VOLTAGE)


    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 "Motor Voltage" in the Data List and read the value displayed on the intelligent tester.

      EMPS
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Motor Voltage

      Power source voltage to active motor/

      Min.: 0 V

      Max.: 98.000 V

      		 20 to 58 V The power switch on (READY) and power steering is operating.
      OK
      The normal condition value is displayed on the intelligent tester.

    NG

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

    OK

    REPLACE POWER STEERING ECU Click here

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


    1. A01NGUEE04
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Power Steering Converter Assembly)

      Disconnect the g8 power steering converter assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      g8-1 (PIG) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A01NDJ8E01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Power Steering ECU)
      *2

      Front view of wire harness connector

      (to Power Steering Converter Assembly)

      Disconnect the F10 power steering ECU connector.

    2. Disconnect the F100 power steering converter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F10-1 (PIG) - F100-1 (VOT1) Always Below 1 Ω
      F10-2 (PGND) - Body ground Always Below 1 Ω
      F10-1 (PIG) or F100-1 (VOT1) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (POWER STEERING CONVERTER - BATTERY)


    1. A01NHFSE04
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Power Steering Converter Assembly)

      Disconnect F101 power steering converter assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      F101-5 (IG) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE POWER STEERING CONVERTER ASSEMBLY Click here