SFI SYSTEM Fuel Injector Circuit

DESCRIPTION

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

WIRING DIAGRAM

A01W0OME05

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. A01W2L3E02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Fuel Injector Assembly)

      Disconnect the fuel injector assembly connectors.

    2. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      D26-2 - Body ground Engine switch on (IG) 11 to 14 V
      D30-2 - Body ground Engine switch on (IG) 11 to 14 V
      D27-2 - Body ground Engine switch on (IG) 11 to 14 V
      D31-2 - Body ground Engine switch on (IG) 11 to 14 V
      D29-2 - Body ground Engine switch on (IG) 11 to 14 V
      D32-2 - Body ground Engine switch on (IG) 11 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (NO. 1 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
      Tester Connection Condition Specified Condition
      D26-1 - D23-58 (#10) Always Below 1 Ω
      D30-1 - D23-54 (#20) Always Below 1 Ω
      D27-1 - D23-57 (#30) Always Below 1 Ω
      D31-1 - D23-53 (#40) Always Below 1 Ω
      D29-1 - D23-56 (#50) Always Below 1 Ω
      D32-1 - D23-55 (#60) Always Below 1 Ω
      D26-1 or D23-58 (#10) - Body ground Always 10 kΩ or higher
      D30-1 or D23-54 (#20) - Body ground Always 10 kΩ or higher
      D27-1 or D23-57 (#30) - Body ground Always 10 kΩ or higher
      D31-1 or D23-53 (#40) - Body ground Always 10 kΩ or higher
      D29-1 or D23-56 (#50) - Body ground Always 10 kΩ or higher
      D32-1 or D23-55 (#60) - Body ground Always 10 kΩ or higher

    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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


    1. Disconnect the fuel injector assembly connectors.

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1A-3 - D26-2 Always Below 1 Ω
      1A-3 - D30-2 Always Below 1 Ω
      1A-3 - D27-2 Always Below 1 Ω
      1A-3 - D31-2 Always Below 1 Ω
      1A-3 - D29-2 Always Below 1 Ω
      1A-3 - D32-2 Always Below 1 Ω
      1A-3 or D26-2 - Body ground Always 10 kΩ or higher
      1A-3 or D30-2 - Body ground Always 10 kΩ or higher
      1A-3 or D27-2 - Body ground Always 10 kΩ or higher
      1A-3 or D31-2 - Body ground Always 10 kΩ or higher
      1A-3 or D29-2 - Body ground Always 10 kΩ or higher
      1A-3 or D32-2 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. INSPECT NO. 1 INTEGRATION RELAY (IG2 RELAY)


    1. Inspect the No. 1 integration relay (IG2 relay) Click here.


    OK

    GO TO ECM POWER SOURCE CIRCUIT Click here

    NG

    REPLACE NO. 1 INTEGRATION RELAY (IG2 RELAY) Click here