SFI SYSTEM Fuel Injector Circuit

DESCRIPTION

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

WIRING DIAGRAM

B008M5OE01

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


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


    1. B008KTAC57
      *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
      C15-1 - Body ground Ignition switch ON 11 to 14 V
      C16-1 - Body ground Ignition switch ON 11 to 14 V
      C17-1 - Body ground Ignition switch ON 11 to 14 V
      C18-1 - Body ground Ignition switch ON 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (FUEL INJECTOR ASSEMBLY - NO. 1 INTEGRATION RELAY) 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 C63 ECM connector.

    2. Disconnect the C15, C16, C17 and C18 fuel injector assembly connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C15-2 - C63-98 (#10) Always Below 1 Ω
      C16-2 - C63-95 (#20) Always Below 1 Ω
      C17-2 - C63-96 (#30) Always Below 1 Ω
      C18-2 - C63-97 (#40) Always Below 1 Ω
      C15-2 or C63-98 (#10) - Body ground and other terminals Always 10 kΩ or higher
      C16-2 or C63-95 (#20) - Body ground and other terminals Always 10 kΩ or higher
      C17-2 or C63-96 (#30) - Body ground and other terminals Always 10 kΩ or higher
      C18-2 or C63-97 (#40) - 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 (FUEL INJECTOR ASSEMBLY - ECM)

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


    1. Disconnect the C15, C16, C17 and C18 fuel injector assembly connectors.

    2. Disconnect the 1B No. 1 integration relay connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C15-1 - 1B-4 Always Below 1 Ω
      C16-1 - 1B-4 Always Below 1 Ω
      C17-1 - 1B-4 Always Below 1 Ω
      C18-1 - 1B-4 Always Below 1 Ω
      C15-1 or 1B-4 - Body ground and other terminals Always 10 kΩ or higher
      C16-1 or 1B-4 - Body ground and other terminals Always 10 kΩ or higher
      C17-1 or 1B-4 - Body ground and other terminals Always 10 kΩ or higher
      C18-1 or 1B-4 - Body ground and other terminals Always 10 kΩ or higher
      Result
      Result Proceed to
      OK A
      NG B

    B

    REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL INJECTOR ASSEMBLY - NO. 1 INTEGRATION RELAY)

    A

  5. CHECK TERMINAL VOLTAGE (POWER SOURCE OF NO. 1 INTEGRATION RELAY)


    1. B008M80C01
      *a Rear view of wire harness connector (to No. 1 integration relay)

      Disconnect the No. 1 integration relay connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      1B-3 - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 1 INTEGRATION RELAY - BATTERY)

    OK

  6. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - BODY GROUND)


    1. B008M80C01
      *a Front view of wire harness connector (to No. 1 integration relay)

      Disconnect the No. 1 integration relay connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1B-6 - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 1 INTEGRATION RELAY - BODY GROUND)

    OK

  7. INSPECT NO. 1 INTEGRATION RELAY


    1. Inspect the No. 1 integration relay.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE NO. 1 INTEGRATION RELAY Click here

    OK

  8. CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 1 - NO. 1 INTEGRATION RELAY)


    1. Remove the EFI-MAIN NO. 1 relay from the No. 1 engine room relay block.

    2. Disconnect the 1B No. 1 integration relay connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 (EFI-MAIN NO. 1 relay holder) - 1B-5 Always Below 1 Ω
      3 (EFI-MAIN NO. 1 relay holder) or 1B-5 - Body ground and other terminals Always 10 kΩ or higher
      Result
      Result Proceed to
      OK A
      NG B

    B

    REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI-MAIN NO. 1 - NO. 1 INTEGRATION RELAY)

    A

  9. CHECK TERMINAL VOLTAGE (POWER SOURCE OF EFI-MAIN NO. 1 RELAY)


    1. B008KPNC01
      *1 No. 1 Engine Room Relay Block
      *2 EFI-MAIN NO. 1 Relay Holder

      Remove the EFI-MAIN NO. 1 relay from the No. 1 engine room relay block.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      5 (EFI-MAIN NO. 1 relay holder) - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI-MAIN NO. 1 RELAY - BATTERY)

    OK

  10. CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 1 RELAY - BODY GROUND)

    B008KPNC02
    *1 No. 1 Engine Room Relay Block
    *2 EFI-MAIN NO. 1 Relay Holder

    1. Remove the EFI-MAIN NO. 1 relay from the No. 1 engine room relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2 (EFI-MAIN NO. 1 relay holder) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI-MAIN NO. 1 RELAY - BODY GROUND)

    OK

  11. INSPECT EFI-MAIN NO. 1 RELAY


    1. Inspect the EFI MAIN NO. 1 relay.

      Click here

      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPLACE EFI-MAIN NO. 1 RELAY