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

A011U2BE03

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. Disconnect the fuel injector assembly connectors.

      A011TN8E81

    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
      E29-1 - Body ground Ignition switch ON 11 to 14 V
      E34-1 - Body ground Ignition switch ON 11 to 14 V
      E31-1 - Body ground Ignition switch ON 11 to 14 V
      E35-1 - Body ground Ignition switch ON 11 to 14 V
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Fuel Injector Assembly)
    NG

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

    OK

  2. INSPECT FUEL INJECTOR ASSEMBLY (INJECTION AND VOLUME)

    1. Check the fuel injector assembly injection and volume 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 ECM connector.

    2. Disconnect the fuel injector assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E29-2 - E26-20 (#10) Always Below 1 Ω
      E34-2 - E26-17 (#20) Always Below 1 Ω
      E31-2 - E26-18 (#30) Always Below 1 Ω
      E35-2 - E26-19 (#40) Always Below 1 Ω
      E29-2 or E26-20 (#10) - Body ground Always 10 kΩ or higher
      E34-2 or E26-17 (#20) - Body ground Always 10 kΩ or higher
      E31-2 or E26-18 (#30) - Body ground Always 10 kΩ or higher
      E35-2 or E26-19 (#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 (NO. 1 INTEGRATION RELAY - FUEL INJECTOR ASSEMBLY)

    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
      E29-1 - 1A-3 Always Below 1 Ω
      E34-1 - 1A-3 Always Below 1 Ω
      E31-1 - 1A-3 Always Below 1 Ω
      E35-1 - 1A-3 Always Below 1 Ω
      E29-1, E34-1, E31-1, E35-1 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