СИСТЕМА SFI Fuel Injector Circuit

DESCRIPTION

The fuel injectors are located on the cylinder head. They inject fuel into the cylinders based on the signals from the ECM.

WIRING DIAGRAM

Refer to DTC P0300 Click here.

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. INSPECT FUEL INJECTOR ASSEMBLY (POWER SOURCE)

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    Text in Illustration
    *a

    Front view of wire harness connector

    (to Fuel Injector Assembly)

    1. Disconnect the fuel injector 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 D24-1 - Body ground Ignition switch ON 11 to 14 V
      No. 2 D25-1 - Body ground Ignition switch ON 11 to 14 V
      No. 3 D26-1 - Body ground Ignition switch ON 11 to 14 V
      No. 4 D27-1 - Body ground Ignition switch ON 11 to 14 V

    NG

    INSPECT INJ/IGN RELAY 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 - ECM)


    1. Disconnect the fuel injector 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 D24-2 - Body ground Always 10 kΩ or higher
      D24-2 - D3-6 (#1) Always Below 1 Ω
      No. 2 D25-2 - Body ground Always 10 kΩ or higher
      D25-2 - D3-5 (#2) Always Below 1 Ω
      No. 3 D26-2 - Body ground Always 10 kΩ or higher
      D26-2 - D3-2 (#3) Always Below 1 Ω
      No. 4 D27-2 - Body ground Always 10 kΩ or higher
      D27-2 - D3-1 (#4) Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here

  4. INSPECT INJ/IGN RELAY


    1. A01BADNE26

      Inspect the INJ/IGN relay.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 5 Battery voltage not applied to terminals 1 and 2 10 kΩ or higher
      Battery voltage applied to terminals 1 and 2 Below 1 Ω

    NG

    REPLACE INJ/IGN RELAY

    OK

  5. CHECK HARNESS AND CONNECTOR (FUEL INJECTOR - IGNITION SWITCH)


    1. Disconnect the fuel injector connector.

    2. Disconnect the INJ/IGN relay from the instrument panel relay block.

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

      Standard Resistance
      Cylinder Tester Connection Condition Specified Condition
      No. 1 D24-1 - Body ground Always 10 kΩ or higher
      D24-1 - INJ/IGN relay terminal 3 Always Below 1 Ω
      No. 2 D25-1 - Body ground Always 10 kΩ or higher
      D25-1 - INJ/IGN relay terminal 3 Always Below 1 Ω
      No. 3 D26-1 - Body ground Always 10 kΩ or higher
      D26-1 - INJ/IGN relay terminal 3 Always Below 1 Ω
      No. 4 D27-1 - Body ground Always 10 kΩ or higher
      D27-1 - INJ/IGN relay terminal 3 Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. INSPECT IGNITION SWITCH ASSEMBLY


    1. Inspect the ignition switch assembly.


    NG

    REPLACE IGNITION SWITCH ASSEMBLY

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (IGNITION SWITCH - BATTERY)