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 supply relay circuit is shut off to stop the power assist.

DTC Code DTC Detection Condition Trouble Area
C1552 A PIG power supply circuit malfunction inside the ECU.

  • EPS fuse

  • PIG power supply circuit

  • Power steering ECU assembly
C1554 A power supply relay circuit malfunction.

WIRING DIAGRAM

A004S46E04
*a from Battery
*b Power Steering ECU

CAUTION / NOTICE / HINT

Note


  • If the power steering ECU assembly is replaced with a new one, perform 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 (PIG POWER SUPPLY)


    1. Turn the ignition switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Start the engine.

    4. Turn the intelligent tester on.

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

      EMPS
      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

      		 11 to 14 V The engine is running and power steering is operating.
      OK
      The normal condition value is displayed the intelligent tester.
      Result
      Result Proceed to
      OK for LHD A
      for RHD B
      NG C

    A

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    B

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    C

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


    1. A004PRSE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Power Steering ECU)

      Disconnect the A29 power steering ECU connector .

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A29-1 (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
      A29-2 (PGND) - Body ground Always Below 1 Ω
      Result
      Result Proceed to
      OK for LHD A
      for RHD B
      NG C

    A

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    B

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR