POWER STEERING SYSTEM(for Manual Tilt and Manual Telescopic Steering Column), Diagnostic DTC:C1551/25

DTC Code DTC Name
C1551/25 IG Power Supply Voltage Malfunction

DESCRIPTION

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

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Return-to-normal Condition
C1551/25 IG Power Supply Voltage Malfunction IG power source circuit malfunction inside ECU

  • EPS-IG fuse (w/o Stop and start system)

  • IG power source circuit

  • ECU wire sub-assembly

  • Power steering ECU assembly

 On After normal confirmation

WIRING DIAGRAM

B005ATYE02

CAUTION / NOTICE / HINT

Note

If the power steering ECU assembly has been replaced, perform assist map writing.

Click here

Tech Tips

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

PROCEDURE


  1. CHECK CONNECTOR CONNECTION CONDITION AND GROUND WIRE


    1. Check the connection condition of the ECU wire sub-assembly and power steering ECU assembly connectors.

      OK
      The ECU wire sub-assembly and power steering ECU assembly connectors are securely connected.

    2. Check that the ground wire is securely installed with the bolt.

      Click here

      OK
      The ground wire is securely installed with the bolt.
      Result
      Proceed to
      OK
      NG

    NG

    CONNECT CONNECTOR OR INSTALL GROUND WIRE

    OK

  2. READ VALUE USING GTS (IG POWER SUPPLY)


    1. Turn the engine switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the engine 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.


      Chassis > EMPS > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      IG Power Supply ECU power source voltage

      Min.: 0.0000 V

      Max.: 20.1531 V

      w/o Stop and Start System:

      Engine switch on (IG): 8 to 16 V

      w/ Stop and Start System:

      Engine switch on (IG): 10.5 to 16 V

      		 -

      Chassis > EMPS > Data List
      Tester Display
      IG Power Supply
      OK
      The normal condition value is displayed on the GTS.
      Result
      Proceed to
      OK
      NG

    OK

    CHECK INTERMITTENT PROBLEMS Click here

    NG

  3. CHECK HARNESS AND CONNECTOR (IG POWER SUPPLY)


    1. B0059GFC04
      *a

      Front view of wire harness connector

      (to ECU Wire Sub-assembly)

      Disconnect the nl1 ECU wire sub-assembly connector.

    2. Turn the engine switch on (IG).

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

      Standard Voltage
      w/o Stop and Start System:
      Tester Connection Switch Condition Specified Condition
      nl1-5 (IG) - Body ground Engine switch on (IG) 8 to 16 V
      w/ Stop and Start System:
      Tester Connection Switch Condition Specified Condition
      nl1-5 (IG) - Body ground Engine switch on (IG) 10.5 to 16 V
      Result
      Proceed to
      OK
      NG (w/o Stop and Start System)
      NG (w/ Stop and Start System)

    NG (w/o Stop and Start System)

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    NG (w/ Stop and Start System)

    GO TO STOP AND START SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    OK

  4. CHECK ECU WIRE SUB-ASSEMBLY


    1. B0058BLC12
      *a

      Front view of wire harness connector

      (to Power Steering ECU Assembly)

      Connect the nl1 connector to the ECU wire sub-assembly.

    2. Disconnect the n3 and n1 power steering ECU assembly connectors.

    3. Turn the engine switch on (IG).

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

      Standard Voltage
      w/o Stop and Start System:
      Tester Connection Switch Condition Specified Condition
      n3-1 (IG) - Body ground Engine switch on (IG) 8 to 16 V
      w/ Stop and Start System:
      Tester Connection Switch Condition Specified Condition
      n3-1 (IG) - Body ground Engine switch on (IG) 10.5 to 16 V

    5. Turn the engine switch off.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      n1-2 (PGND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE ECU WIRE SUB-ASSEMBLY Click here