POWER STEERING SYSTEM (for 2GR), Diagnostic DTC:C1552, C1554

DTC Code DTC Name
C1552 PIG Power Supply Voltage Malfunction
C1554 Power Supply Relay Failure

DESCRIPTION

When a problem occurs in the power steering system, the power source relay circuit is shut off to stop the power assist.

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

  • EPS fuse

  • PIG power source circuit

  • ECU wire sub-assembly

  • Power steering ECU assembly
C1554 Power source relay circuit malfunction

  • EPS fuse

  • PIG power source circuit

  • ECU wire sub-assembly

  • Power steering ECU assembly

WIRING DIAGRAM

A01HMGXE01

INSPECTION PROCEDURE

Note

If the power steering ECU assembly has been replaced, perform assist map writing Click here.

Tech Tips

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

PROCEDURE


  1. CHECK CONNECTOR CONNECTION CONDITION AND GROUND WIRE


    1. Check the connection condition of the ECU wire sub-assembly and power steering ECU assembly connectors.

      OK
      The ECU wire sub-assembly and power steering ECU assembly connectors are securely connected.

    2. Check that the ground wire is securely installed with the bolt Click here.

      OK
      The ground wire is securely installed with the bolt.

    NG

    CONNECT CONNECTOR OR INSTALL GROUND WIRE Click here

    OK

  2. READ VALUE USING TECHSTREAM (PIG POWER SUPPLY)


    1. Turn the engine switch off.

    2. Connect the Techstream to the DLC3.

    3. Start the engine.

    4. Turn the Techstream on.

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

    6. Select the item "PIG Power Supply" in the Data List and read the value displayed on the Techstream.

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

      PIG power supply/

      Min.: 0 V

      Max.: 20.1531 V

      		 9 to 16 V Engine running and steering wheel being turned
      OK
      The normal condition value is displayed on the Techstream.

    NG

    CHECK HARNESS AND CONNECTOR (BATTERY - ECU WIRE SUB-ASSEMBLY) Click here

    OK

    CHECK INTERMITTENT PROBLEMS Click here

  3. CHECK HARNESS AND CONNECTOR (BATTERY - ECU WIRE SUB-ASSEMBLY)


    1. A01HPHJE03
      Text in Illustration
      *a

      Front view of wire harness connector

      (to ECU Wire Sub-assembly)

      Disconnect the Ij1 connector from the ECU wire sub-assembly.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      Ij1-1 (PIG) - Body ground Always 9 to 16 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK ECU WIRE SUB-ASSEMBLY


    1. A01HPJ0E04
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Power Steering ECU Assembly)

      Connect the Ij1 connector to the ECU wire sub-assembly.

    2. Disconnect the power steering ECU assembly j2 connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      j2-1 (PIG) - Body ground Always 9 to 16 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      j2-2 (PGND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE ECU WIRE SUB-ASSEMBLY Click here

    OK

    REPLACE POWER STEERING ECU ASSEMBLY Click here