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

A005BFRE06

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. A005BH9E02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Fuel Injector Assembly)

      Disconnect the fuel injector assembly connectors.

    2. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      D14-1 - Body ground Power switch on (IG) 11 to 14 V
      D15-1 - Body ground Power switch on (IG) 11 to 14 V
      D16-1 - Body ground Power switch on (IG) 11 to 14 V
      D17-1 - Body ground Power switch on (IG) 11 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (NO. 2 INTEGRATION RELAY (IG2 RELAY) - FUEL INJECTOR ASSEMBLY) Click here

    OK

  2. INSPECT FUEL INJECTOR ASSEMBLY


    1. Inspect 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
      D14-2 - D28-85 (#10) Always Below 1 Ω
      D15-2 - D28-84 (#20) Always Below 1 Ω
      D16-2 - D28-83 (#30) Always Below 1 Ω
      D17-2 - D28-82 (#40) Always Below 1 Ω
      D14-2 or D28-85 (#10) - Body ground Always 10 Ω or higher
      D15-2 or D28-84 (#20) - Body ground Always 10 Ω or higher
      D16-2 or D28-83 (#30) - Body ground Always 10 Ω or higher
      D17-2 or D28-82 (#40) - Body ground Always 10 Ω 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. 2 INTEGRATION RELAY (IG2 RELAY) - FUEL INJECTOR ASSEMBLY)


    1. Disconnect the fuel injector assembly connectors.

    2. Remove the No. 2 integration relay (IG2 relay) from the engine room relay block and junction block assembly.

    3. Disconnect the No. 2 integration relay connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D14-1 - 1A-4 Always Below 1 Ω
      D15-1 - 1A-4 Always Below 1 Ω
      D16-1 - 1A-4 Always Below 1 Ω
      D17-1 - 1A-4 Always Below 1 Ω
      D14-1 or 1A-4 - Body ground Always 10 kΩ or higher
      D15-1 or 1A-4 - Body ground Always 10 kΩ or higher
      D16-1 or 1A-4 - Body ground Always 10 kΩ or higher
      D17-1 or 1A-4 - Body ground Always 10 kΩ or higher

    OK

    CHECK ECM POWER SOURCE CIRCUIT Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR