SFI SYSTEM Fuel Injector Circuit

DESCRIPTION

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

WIRING DIAGRAM

A01EMF8E03
A01EJOFE03

INSPECTION PROCEDURE

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. A01EJAOE71
      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
      Tester Connection Condition Specified Condition
      B44-1 - Body ground Ignition switch ON 11 to 14 V
      B45-1 - Body ground Ignition switch ON 11 to 14 V
      B46-1 - Body ground Ignition switch ON 11 to 14 V
      B47-1 - Body ground Ignition switch ON 11 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (IG2 RELAY - FUEL INJECTOR ASSEMBLY) Click here

    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
      Tester Connection Condition Specified Condition
      B44-2 - B58-85 (#10) Always Below 1 Ω
      B45-2 - B58-84 (#20) Always Below 1 Ω
      B46-2 - B58-83 (#30) Always Below 1 Ω
      B47-2 - B58-82 (#40) Always Below 1 Ω
      B44-2 or B58-85 (#10) - Body ground Always 10 kΩ or higher
      B45-2 or B58-84 (#20) - Body ground Always 10 kΩ or higher
      B46-2 or B58-83 (#30) - Body ground Always 10 kΩ or higher
      B47-2 or B58-82 (#40) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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

  4. CHECK HARNESS AND CONNECTOR (IG2 RELAY - FUEL INJECTOR ASSEMBLY)


    1. Disconnect the fuel injector assembly connector.

    2. Remove the IG2 relay from the engine room relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B44-1 - 5 (IG2 relay terminal) Always Below 1 Ω
      B45-1 - 5 (IG2 relay terminal) Always Below 1 Ω
      B46-1 - 5 (IG2 relay terminal) Always Below 1 Ω
      B47-1 - 5 (IG2 relay terminal) Always Below 1 Ω
      B44-1 or 5 (IG2 relay terminal) - Body ground Always 10 kΩ or higher
      B45-1 or 5 (IG2 relay terminal) - Body ground Always 10 kΩ or higher
      B46-1 or 5 (IG2 relay terminal) - Body ground Always 10 kΩ or higher
      B47-1 or 5 (IG2 relay terminal) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    CHECK ECM POWER SOURCE CIRCUIT Click here