POWER STEERING SYSTEM, 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 system, the power source relay circuit and the motor relay circuit are shut off to stop the power assist. The ECU must be replaced when there is a problem with the relays because the relays are built into the ECU.

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

  • 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

B000JF2E04

INSPECTION PROCEDURE

Note

If the power steering ECU assembly has been replaced with a new one, perform assist map writing 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. CHECK CONNECTOR CONNECTION CONDITION


    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 INTELLIGENT TESTER


    1. Turn the ignition switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Turn ignition switch to ON.

    4. Turn the intelligent tester 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 intelligent tester.

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

      PIG power supply/

      Min.: 0.0000 V

      Max.: 20.1531 V

      		 9 to 16 V Always
      OK
      The normal condition value is displayed on the intelligent tester.

    NG

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

    OK

    REPLACE POWER STEERING ECU ASSEMBLY Click here

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


    1. B000L1CE04
      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 HARNESS AND CONNECTOR (POWER STEERING ECU ASSEMBLY - BODY GROUND)


    1. B000JELE06
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Power Steering ECU Assembly)

      Disconnect the j2 connector from the power steering ECU assembly.

    2. 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

  5. CHECK ECU WIRE SUB-ASSEMBLY


    1. B000HF3E04
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Power Steering ECU Assembly)
      *b

      Front view of wire harness connector

      (to Vehicle Wire Harness)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      j2-1 (PIG) - Ij1-1 (PIG) Always Below 1 Ω

    NG

    REPAIR OR REPLACE ECU WIRE SUB-ASSEMBLY Click here

    OK

    REPLACE POWER STEERING ECU ASSEMBLY Click here