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

A002NLCE02

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. A002QP2E02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Fuel Injector Assembly)

      Disconnect the fuel injector assembly connectors.

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      C13-1 - Body ground Ignition switch ON 11 to 14 V
      C15-1 - Body ground Ignition switch ON 11 to 14 V
      C17-1 - Body ground Ignition switch ON 11 to 14 V
      C19-1 - Body ground Ignition switch ON 11 to 14 V

    4. Reconnect the fuel injector assembly connectors.


    NG

    CHECK HARNESS AND CONNECTOR (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.


    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 (Check for Open)
      Tester Connection Condition Specified Condition
      C13-2 - C111-98 (#10) Always Below 1 Ω
      C15-2 - C111-95 (#20) Always Below 1 Ω
      C17-2 - C111-96 (#30) Always Below 1 Ω
      C19-2 - C111-97 (#40) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      C13-2 or C111-98 (#10) - Body ground Always 10 kΩ or higher
      C15-2 or C111-95 (#20) - Body ground Always 10 kΩ or higher
      C17-2 or C111-96 (#30) - Body ground Always 10 kΩ or higher
      C19-2 or C111-97 (#40) - Body ground Always 10 kΩ or higher

    4. Reconnect the fuel injector assembly connectors.

    5. Reconnect the ECM connector.


    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL INJECTOR ASSEMBLY - ECM)

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


    1. Disconnect the fuel injector assembly connectors.

    2. Remove the integration relay from the engine room No. 1 relay block.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      C13-1 - 1B-8 Always Below 1 Ω
      C15-1 - 1B-8 Always Below 1 Ω
      C17-1 - 1B-8 Always Below 1 Ω
      C19-1 - 1B-8 Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      C13-1 or 1B-8 - Body ground Always 10 kΩ or higher
      C15-1 or 1B-8 - Body ground Always 10 kΩ or higher
      C17-1 or 1B-8 - Body ground Always 10 kΩ or higher
      C19-1 or 1B-8 - Body ground Always 10 kΩ or higher

    4. Reinstall the integration relay.

    5. Reconnect the fuel injector assembly connector.


    NG

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

    OK

  5. INSPECT INTEGRATION RELAY (IGT/INJ RELAY)


    1. Inspect the IGT/INJ relay Click here.


    NG

    REPLACE INTEGRATION RELAY

    OK

  6. CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - INTEGRATION RELAY)


    1. Remove the integration relay from the engine room No. 1 relay block.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      1B-4 - 1B-6 Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      1B-4 or 1B-6 - Body ground Always 10 kΩ or higher

    3. Reconnect the integration relay connector.

    4. Reinstall the integration relay.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (INTEGRATION RELAY - INTEGRATION RELAY)

    OK

  7. CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - BODY GROUND)


    1. Remove the integration relay from the engine room No. 1 relay block.

    2. Disconnect the integration relay connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      1B-7 - Body ground Always Below 1 Ω

    4. Reconnect the integration relay connector.

    5. Reinstall the integration relay.


    OK

    GO TO ECM POWER SOURCE CIRCUIT Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (INTEGRATION RELAY - BODY GROUND)