POWER STEERING SYSTEM, Diagnostic DTC:C1551

DTC Code DTC Name
C1551 IG Power Supply Voltage Malfunction

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

B001KO4E38
*a from IG1 No. 1 Relay
*b ECU-IG No. 2
*c Power Steering ECU Assembly

CAUTION / NOTICE / HINT

Note

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


    1. Turn the power switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the power switch on (IG).

    4. Turn the intelligent tester 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 intelligent tester.

      EMPS
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      IG power supply

      IG power supply/

      Min.: 0 V

      Max.: 20.1531 V

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

    OK

    CHECK INTERMITTENT PROBLEMS Click here

    NG

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


    1. B001MMJE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Power Steering ECU Assembly)

      Disconnect the connectors from the power steering ECU assembly.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      H25-6 (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
      A26-2 (PGND) - Body ground Always Below 1 Ω

    OK

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR