SFI SYSTEM Fuel Injector Circuit

DESCRIPTION

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

WIRING DIAGRAM



CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. CHECK FUEL INJECTOR ASSEMBLY (POWER SOURCE)


    1. B001WIZE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Fuel Injector Assembly)

      Disconnect the fuel injector assembly connector.

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Cylinder Tester Connection Switch Condition Specified Condition
      No. 1 C5-1 - Body ground Ignition switch ON 11 to 14 V
      No. 2 C16-1 - Body ground Ignition switch ON 11 to 14 V
      No. 3 C7-1 - Body ground Ignition switch ON 11 to 14 V
      No. 4 C14-1 - Body ground Ignition switch ON 11 to 14 V
      No. 5 C9-1 - Body ground Ignition switch ON 11 to 14 V
      No. 6 C12-1 - Body ground Ignition switch ON 11 to 14 V

    4. Turn the ignition switch off.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (INTEGRATION RELAY (IG2 MAIN) - FUEL INJECTOR ASSEMBLY)

    OK

  2. INSPECT FUEL INJECTOR ASSEMBLY


    1. Inspect the fuel injector assembly Click here.


    NG

    REPLACE FUEL INJECTOR ASSEMBLY Click here

    OK

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


    1. Disconnect the fuel injector assembly connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance
      Cylinder Tester Connection Condition Specified Condition
      No. 1 C5-2 - Body ground Always 10 kΩ or higher
      C5-2 - C45-86 (#10) Always Below 1 Ω
      No. 2 C16-2 - Body ground Always 10 kΩ or higher
      C16-2 - C45-109 (#20) Always Below 1 Ω
      No. 3 C7-2 - Body ground Always 10 kΩ or higher
      C7-2 - C45-85 (#30) Always Below 1 Ω
      No. 4 C14-2 - Body ground Always 10 kΩ or higher
      C14-2 - C45-108 (#40) Always Below 1 Ω
      No. 5 C9-2 - Body ground Always 10 kΩ or higher
      C9-2 - C45-84 (#50) Always Below 1 Ω
      No. 6 C12-2 - Body ground Always 10 kΩ or higher
      C12-2 - C45-107 (#60) Always Below 1 Ω

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR