POWER STEERING SYSTEM, Diagnostic DTC:C1551

DTC Code DTC Name
C1551 IG Power Supply Voltage

DESCRIPTION

The power steering ECU assembly distinguishes the power switch status as on (IG) or off through the IG power source circuit.

DTC No. DTC Detection Condition Trouble Area
C1551 IG power source circuit malfunction inside ECU

  • ECU-IG No. 2 fuse

  • IG power source circuit

  • Power steering ECU assembly

WIRING DIAGRAM

A004108E57

INSPECTION PROCEDURE

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


    1. Turn the power switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the power switch on (IG).

    4. Turn the GTS on.

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

    6. Select the item "IG Power Supply" in the Data List and read the value displayed on the GTS.

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

      IG power source voltage/

      Min.: 0.0000 V

      Max.: 20.1531 V

      		 9 to 16 V Power switch on (IG)
      OK
      The normal condition value is displayed on the GTS.

    NG

    CHECK HARNESS AND CONNECTOR (AUXILIARY BATTERY - POWER STEERING ECU ASSEMBLY) Click here

    OK

    CHECK INTERMITTENT PROBLEMS Click here

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


    1. A003ZZQE45
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Power Steering ECU Assembly)

      Disconnect the L45 and A27 power steering ECU assembly connectors.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      L45-6 (IG) - Body ground Power switch on (IG) 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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE POWER STEERING ECU ASSEMBLY Click here