SFI SYSTEM Fuel Injector Circuit

DESCRIPTION

The fuel injector assemblies are located on the intake port. They inject fuel into the cylinders based on the signals from the ECM.

WIRING DIAGRAM

B006KP5E02

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. CHECK TERMINAL VOLTAGE (POWER SOURCE OF FUEL INJECTOR ASSEMBLY)

    B006NOTC18
    *a

    Front view of wire harness connector

    (to Fuel Injector Assembly)

    1. Disconnect the fuel injector assembly connectors.

    2. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      D45-2 - Body ground Engine switch on (IG) 11 to 14 V
      D46-2 - Body ground Engine switch on (IG) 11 to 14 V
      D47-2 - Body ground Engine switch on (IG) 11 to 14 V
      D48-2 - Body ground Engine switch on (IG) 11 to 14 V
      D49-2 - Body ground Engine switch on (IG) 11 to 14 V
      D50-2 - Body ground Engine switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - FUEL INJECTOR ASSEMBLY) Click here

    OK

  2. INSPECT FUEL INJECTOR ASSEMBLY


    1. Inspect the fuel injector assembly.

      Click here

      Tech Tips

      Perform "Inspection After Repair" after replacing the fuel injector assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FUEL INJECTOR ASSEMBLY Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (FUEL INJECTOR ASSEMBLY - ECM)


    1. Disconnect the fuel injector assembly connectors.

    2. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D45-1 - D73-58 (#10) Always Below 1 Ω
      D46-1 - D73-54 (#20) Always Below 1 Ω
      D47-1 - D73-57 (#30) Always Below 1 Ω
      D48-1 - D73-53 (#40) Always Below 1 Ω
      D49-1 - D73-56 (#50) Always Below 1 Ω
      D50-1 - D73-55 (#60) Always Below 1 Ω
      D45-1 or D73-58 (#10) - Body ground and other terminals Always 10 kΩ or higher
      D46-1 or D73-54 (#20) - Body ground and other terminals Always 10 kΩ or higher
      D47-1 or D73-57 (#30) - Body ground and other terminals Always 10 kΩ or higher
      D48-1 or D73-53 (#40) - Body ground and other terminals Always 10 kΩ or higher
      D49-1 or D73-56 (#50) - Body ground and other terminals Always 10 kΩ or higher
      D50-1 or D73-55 (#60) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  4. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - FUEL INJECTOR ASSEMBLY)


    1. Disconnect the No. 1 integration relay connector.

    2. Disconnect the fuel injector assembly connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1D-8 - D45-2 Always Below 1 Ω
      1D-8 - D46-2 Always Below 1 Ω
      1D-8 - D47-2 Always Below 1 Ω
      1D-8 - D48-2 Always Below 1 Ω
      1D-8 - D49-2 Always Below 1 Ω
      1D-8 - D50-2 Always Below 1 Ω
      1D-8 or D45-2 - Body ground and other terminals Always 10 kΩ or higher
      1D-8 or D46-2 - Body ground and other terminals Always 10 kΩ or higher
      1D-8 or D47-2 - Body ground and other terminals Always 10 kΩ or higher
      1D-8 or D48-2 - Body ground and other terminals Always 10 kΩ or higher
      1D-8 or D49-2 - Body ground and other terminals Always 10 kΩ or higher
      1D-8 or D50-2 - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    GO TO ECM POWER SOURCE CIRCUIT Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR