SFI SYSTEM (w/o Secondary Air Injection System) Fuel Injector Circuit

DESCRIPTION

The fuel injectors are located on the cylinder head. They inject fuel into the cylinders based on the signals from the ECM.

WIRING DIAGRAM

A01BEJBE01

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. INSPECT FUEL INJECTOR ASSEMBLY (POWER SOURCE)

    A01BBZ3E29
    Text in Illustration
    *a

    Front view of wire harness connector

    (to Fuel Injector Assembly)

    1. Disconnect the fuel injector 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 Switch Condition Specified Condition
      D24-1 - Body ground Ignition switch ON 11 to 14 V
      D25-1 - Body ground Ignition switch ON 11 to 14 V
      D26-1 - Body ground Ignition switch ON 11 to 14 V
      D27-1 - Body ground Ignition switch ON 11 to 14 V

    NG

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


    1. Disconnect the fuel injector 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
      D24-2 - D97-86 (#10) Always Below 1 Ω
      D25-2 - D97-85 (#20) Always Below 1 Ω
      D26-2 - D97-84 (#30) Always Below 1 Ω
      D27-2 - D97-83 (#40) Always Below 1 Ω
      D24-2 or D97-86 (#10) - Body ground Always 10 kΩ or higher
      D25-2 or D97-85 (#20) - Body ground Always 10 kΩ or higher
      D26-2 or D97-84 (#30) - Body ground Always 10 kΩ or higher
      D27-2 or D97-83 (#40) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here

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


    1. Disconnect the fuel injector connectors.

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D24-1 - 10B-4 Always Below 1 Ω
      D25-1 - 10B-4 Always Below 1 Ω
      D26-1 - 10B-4 Always Below 1 Ω
      D27-1 - 10B-4 Always Below 1 Ω
      D24-1 or 10B-4 - Body ground Always 10 kΩ or higher
      D25-1 or 10B-4 - Body ground Always 10 kΩ or higher
      D26-1 or 10B-4 - Body ground Always 10 kΩ or higher
      D27-1 or 10B-4 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. INSPECT INTEGRATION NO.1 RELAY (INJ)


    1. Inspect the No. 1 integration relay (INJ) Click here.


    NG

    REPLACE NO. 1 INTEGRATION RELAY

    OK

  6. CHECK NO. 1 INTEGRATION RELAY (POWER SOURCE)

    A01BI3QE01
    Text in Illustration
    *a

    Front view of wire harness connector

    (to No. 1 Integration Relay)

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

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      10B-1 - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 1 INTEGRATION RELAY - BATTERY)

    OK

  7. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - NO. 2 INTEGRATION RELAY, BODY GROUND)


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

    2. Remove the No. 2 integration relay from the instrument panel relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      10B-2 - 12B-7 Always Below 1 Ω
      10B-3 - Body ground Always Below 1 Ω
      10B-2 or 12B-7 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    CHECK ECM POWER SOURCE CIRCUIT Click here