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 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

  • Power steering ECU
C1554 Power source relay circuit malfunction

  • EPS fuse

  • PIG power source circuit

  • Power steering ECU

WIRING DIAGRAM

A01JBOEE12

INSPECTION PROCEDURE

Note

If the steering column assembly or power steering ECU has been replaced, perform the rotation angle sensor 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 (PIG POWER SUPPLY)


    1. Turn the power switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the power switch on (READY).

    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 V

      Max.: 20.1531 V

      		 11 to 14 V Power switch on (READY) and power steering in operation
      OK
      The normal condition value is displayed on the intelligent tester.

    NG

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

    OK

    CHECK INTERMITTENT PROBLEMS

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


    1. A01JAC1E20
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Power Steering ECU)

      Disconnect the connector from the power steering ECU.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A27-1 (PIG) - Body ground Always 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A27-2 (PGND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE POWER STEERING ECU Click here