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SFI SYSTEM Fuel Injector Circuit

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DTC Code DTC Name
  Fuel Injector Circuit
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DESCRIPTION

The Fuel injectors are installed in the intake port, and inject fuel into the cylinders based on the signals from the ECM.

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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

  • Perform electronic throttle learning after replacing the ECM (Click here).

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PROCEDURE


  1. Click here

    INSPECT FUEL INJECTOR ASSEMBLY (POWER SOURCE)


    1. A01VGXZE02

      Disconnect the fuel injector assembly connector.

    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
      B5-2 - Body ground Ignition switch ON 11 to 14 V
      B7-2 - Body ground Ignition switch ON 11 to 14 V
      B9-2 - Body ground Ignition switch ON 11 to 14 V
      Table 1. Text in Illustration
      *a

      Front view of wire harness connector

      (to Fuel Injector Assembly)

  2. Click here

    INSPECT FUEL INJECTOR ASSEMBLY (INJECTION AND VOLUME)


    1. Check the fuel injector injection and volume (Click here).


  3. Click here

    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
      B5-1 - B87-45 (#10) Always Below 1 Ω
      B7-1 - B87-46 (#20) Always Below 1 Ω
      B9-1 - B87-67 (#30) Always Below 1 Ω
      B5-1 or B87-45 (#10) - Body ground Always 10 kΩ or higher
      B7-1 or B87-46 (#20) - Body ground Always 10 kΩ or higher
      B9-1 or B87-67 (#30) - Body ground Always 10 kΩ or higher

    • OK

      PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (Click here)

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  4. Click here

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


    1. Remove the No. 1 integration relay from the engine room relay block.

    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
      B5-2 - 1E-4 Always Below 1 Ω
      B7-2 - 1E-4 Always Below 1 Ω
      B9-2 - 1E-4 Always Below 1 Ω
      B5-2 or 1E-4 - Body ground Always 10 kΩ or higher
      B7-2 or 1E-4 - Body ground Always 10 kΩ or higher
      B9-2 or 1E-4 - Body ground Always 10 kΩ or higher

    • OK

      CHECK ECM POWER SOURCE CIRCUIT (Click here)

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR