SFI SYSTEM Fuel Injector Circuit

DESCRIPTION

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

WIRING DIAGRAM

A01G6Q9E02

INSPECTION PROCEDURE

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. A01G9IPE03
      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
      D25-1 - Body ground Engine switch on (IG) 11 to 14 V
      D30-1 - Body ground Engine switch on (IG) 11 to 14 V
      D28-1 - Body ground Engine switch on (IG) 11 to 14 V
      D31-1 - Body ground Engine switch on (IG) 11 to 14 V

    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.


    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
      D25-2 - D70-20 (#10) Always Below 1 Ω
      D30-2 - D70-17 (#20) Always Below 1 Ω
      D28-2 - D70-18 (#30) Always Below 1 Ω
      D31-2 - D70-19 (#40) Always Below 1 Ω
      D25-2 or D70-20 (#10) - Body ground Always 10 kΩ or higher
      D30-2 or D70-17 (#20) - Body ground Always 10 kΩ or higher
      D28-2 or D70-18 (#30) - Body ground Always 10 kΩ or higher
      D31-2 or D70-19 (#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 (FUEL INJECTOR ASSEMBLY - NO. 1 INTEGRATION RELAY)


    1. Disconnect the fuel injector assembly connector.

    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
      D25-1 - 1A-3 Always Below 1 Ω
      D30-1 - 1A-3 Always Below 1 Ω
      D28-1 - 1A-3 Always Below 1 Ω
      D31-1 - 1A-3 Always Below 1 Ω
      D25-1, D30-1, D28-1, D31-1 or 1A-3 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    CHECK ECM POWER SOURCE CIRCUIT Click here