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

A01QPCQE01

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. A01QRYOC08
      *a

      Front view of wire harness connector

      (to Fuel Injector Assembly)

      Disconnect the fuel injector assembly connectors.

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      B19-1 - Body ground Ignition switch ON 11 to 14 V
      B17-1 - Body ground Ignition switch ON 11 to 14 V
      B15-1 - Body ground Ignition switch ON 11 to 14 V
      B13-1 - Body ground Ignition switch ON 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (FUEL INJECTOR ASSEMBLY - IG2 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.

      Result
      Proceed to
      OK
      NG

    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 connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B19-2 - B75-20 (#10) Always Below 1 Ω
      B17-2 - B75-17 (#20) Always Below 1 Ω
      B15-2 - B75-18 (#30) Always Below 1 Ω
      B13-2 - B75-19 (#40) Always Below 1 Ω
      B19-2 or B75-20 (#10) - Body ground Always 10 kΩ or higher
      B17-2 or B75-17 (#20) - Body ground Always 10 kΩ or higher
      B15-2 or B75-18 (#30) - Body ground Always 10 kΩ or higher
      B13-2 or B75-19 (#40) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    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 (FUEL INJECTOR ASSEMBLY - IG2 RELAY)


    1. Disconnect the fuel injector assembly connectors.

    2. Remove the IG2 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
      B19-1 - 5 (IG2 relay) Always Below 1 Ω
      B17-1 - 5 (IG2 relay) Always Below 1 Ω
      B15-1 - 5 (IG2 relay) Always Below 1 Ω
      B13-1 - 5 (IG2 relay) Always Below 1 Ω
      B19-1 or 5 (IG2 relay) - Body ground Always 10 kΩ or higher
      B17-1 or 5 (IG2 relay) - Body ground Always 10 kΩ or higher
      B15-1 or 5 (IG2 relay) - Body ground Always 10 kΩ or higher
      B13-1 or 5 (IG2 relay) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    GO TO ECM POWER SOURCE CIRCUIT Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR