POWER STEERING SYSTEM, Diagnostic DTC:C1552, C1554

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

DESCRIPTION

If 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. Detection Item DTC Detection Condition Trouble Area Warning Indicate Note
C1552 PIG Power Supply Voltage PIG power source circuit malfunction

  • EPS fuse

  • PIG power source circuit

  • ECU wire sub-assembly

  • Power steering ECU assembly

 EPS warning light: Comes on -
C1554 Power Supply Relay Failure Power source relay circuit malfunction

  • EPS fuse

  • PIG power source circuit

  • ECU wire sub-assembly

  • Power steering ECU assembly

 EPS warning light: Comes on -

WIRING DIAGRAM

A00294UE02

CAUTION / NOTICE / HINT

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 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.
      Result
      Proceed to
      OK
      NG

    NG

    CONNECT CONNECTOR OR INSTALL GROUND WIRE Click here

    OK

  2. READ VALUE USING GTS (PIG 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 item "PIG Power Supply" in the Data List and read the value displayed on the GTS.


      Chassis > EMPS > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      PIG Power Supply Power source voltage to active motor

      Min.: 0.0000 V

      Max.: 20.1531 V

      		 9 to 16 V Always

      Chassis > EMPS > Data List
      Tester Display
      PIG Power Supply
      OK
      The normal condition value is displayed on the GTS.
      Result
      Proceed to
      OK
      NG

    OK

    CHECK INTERMITTENT PROBLEMS Click here

    NG

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


    1. A0029CXC01
      *a

      Front view of wire harness connector

      (to ECU Wire Sub-assembly)

      Disconnect the Fp1 ECU wire sub-assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      Fp1-1 (PIG) - Body ground Always 9 to 16 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK ECU WIRE SUB-ASSEMBLY


    1. A002AEGC08
      *a

      Front view of wire harness connector

      (to Power Steering ECU Assembly)

      Connect the Fp1 connector to the ECU wire sub-assembly.

    2. Disconnect the p2 power steering ECU assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      p2-1 (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
      p2-2 (PGND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE ECU WIRE SUB-ASSEMBLY Click here