POWER STEERING SYSTEM (for 2GR), Diagnostic DTC:C1551

DTC Code DTC Name
C1551 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. DTC Detection Condition Trouble Area
C1551 IG power source circuit malfunction inside ECU

  • EPS-IG1 fuse

  • IG power source circuit

  • ECU wire sub-assembly

  • Power steering ECU assembly

WIRING DIAGRAM

A011V6OE01

INSPECTION PROCEDURE

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 inspection 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.
    NG

    CONNECT CONNECTOR OR INSTALL GROUND WIRE Click here

    OK

  2. READ VALUE USING TECHSTREAM (IG POWER SUPPLY)

    1. Turn the engine switch off.

    2. Connect the Techstream to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the Techstream 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 Techstream.

      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 Engine switch on (IG)
      OK
      The normal condition value is displayed on the Techstream.
    NG

    CHECK HARNESS AND CONNECTOR (BATTERY - ECU WIRE SUB-ASSEMBLY) Click here

    OK

    CHECK INTERMITTENT PROBLEMS Click here

  3. CHECK HARNESS AND CONNECTOR (BATTERY - ECU WIRE SUB-ASSEMBLY)

    1. Disconnect the Ij2 connector from the ECU wire sub-assembly.

      A011UE7E03

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      Ij2-5 (IG) - Body ground Engine switch on (IG) 9 to 16 V
      Text in Illustration
      *a

      Front view of wire harness connector

      (to ECU Wire Sub-assembly)
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK ECU WIRE SUB-ASSEMBLY

    1. Connect the Ij2 connector to the ECU wire sub-assembly.

      A011SO5E04

    2. Disconnect the power steering ECU assembly j3 and j2 connectors.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      j3-1 (IG) - Body ground Engine switch on (IG) 9 to 16 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      j2-2 (PGND) - Body ground Always Below 1 Ω
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Power Steering ECU Assembly)
    NG

    REPAIR OR REPLACE ECU WIRE SUB-ASSEMBLY Click here

    OK

    REPLACE POWER STEERING ECU ASSEMBLY Click here