POWER STEERING SYSTEM, Diagnostic DTC:C1552/22, C1554/23

DTC Code DTC Name
C1552/22 PIG Power Supply Voltage Malfunction
C1554/23 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
C1552/22 PIG power source circuit malfunction inside ECU

  • EPS fuse

  • PIG power source circuit

  • Power steering ECU assembly
C1554/23 Power source relay circuit malfunction

  • EPS fuse

  • PIG power source circuit

  • Power steering ECU assembly

WIRING DIAGRAM

A005ETEE01
*a MAIN
*b Auxiliary Battery
*c Power Steering ECU Assembly

CAUTION / NOTICE / HINT

Note

If the power steering ECU assembly has been replaced with a new one, perform assist map writing and rotation angle sensor value initialization torque sensor zero point calibration after performing the initialization of the torque sensor zero point value Click here.

Tech Tips

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

PROCEDURE


  1. READ VALUE USING GTS (PIG POWER SUPPLY)


    1. Turn the power switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the power switch on (READY).

    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.

      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 GTS.

    OK

    CHECK INTERMITTENT PROBLEMS Click here

    NG

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


    1. A005CRIE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Power Steering ECU Assembly)

      Disconnect the connector from the power steering ECU assembly.

    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 9 to 16 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

    OK

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR