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

A011UWVE05

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.

      A011TN8E84

    2. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      E30-2 - Body ground Engine switch on (IG) 11 to 14 V
      E34-2 - Body ground Engine switch on (IG) 11 to 14 V
      E32-2 - Body ground Engine switch on (IG) 11 to 14 V
      E35-2 - Body ground Engine switch on (IG) 11 to 14 V
      E33-2 - Body ground Engine switch on (IG) 11 to 14 V
      E36-2 - Body ground Engine switch on (IG) 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

    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
      E30-1 - E26-58 (#10) Always Below 1 Ω
      E34-1 - E26-54 (#20) Always Below 1 Ω
      E32-1 - E26-57 (#30) Always Below 1 Ω
      E35-1 - E26-53 (#40) Always Below 1 Ω
      E33-1 - E26-56 (#50) Always Below 1 Ω
      E36-1 - E26-55 (#60) Always Below 1 Ω
      E30-1 or E26-58 (#10) - Body ground Always 10 kΩ or higher
      E34-1 or E26-54 (#20) - Body ground Always 10 kΩ or higher
      E32-1 or E26-57 (#30) - Body ground Always 10 kΩ or higher
      E35-1 or E26-53 (#40) - Body ground Always 10 kΩ or higher
      E33-1 or E26-56 (#50) - Body ground Always 10 kΩ or higher
      E36-1 or E26-55 (#60) - 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 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 - E30-2 Always Below 1 Ω
      1A-3 - E34-2 Always Below 1 Ω
      1A-3 - E32-2 Always Below 1 Ω
      1A-3 - E35-2 Always Below 1 Ω
      1A-3 - E33-2 Always Below 1 Ω
      1A-3 - E36-2 Always Below 1 Ω
      1A-3 or E30-2 - Body ground Always 10 kΩ or higher
      1A-3 or E34-2 - Body ground Always 10 kΩ or higher
      1A-3 or E32-2 - Body ground Always 10 kΩ or higher
      1A-3 or E35-2 - Body ground Always 10 kΩ or higher
      1A-3 or E33-2 - Body ground Always 10 kΩ or higher
      1A-3 or E36-2 - 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.

    NG

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

    OK

    GO TO ECM POWER SOURCE CIRCUIT Click here