SFI SYSTEM(w/o Canister Pump Module) Fuel Injector Circuit

DESCRIPTION

The fuel injector assemblies are located in each intake port and inject fuel into the cylinders based on the signals from the ECM.

WIRING DIAGRAM

B004OOJE01

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. CHECK TERMINAL VOLTAGE (POWER SOURCE OF FUEL INJECTOR ASSEMBLY)


    1. Disconnect the fuel injector assembly connector.

    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
      C14-1 - Body ground Power switch on (IG) 11 to 14 V
      C15-1 - Body ground Power switch on (IG) 11 to 14 V
      C16-1 - Body ground Power switch on (IG) 11 to 14 V
      C17-1 - Body ground Power switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

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

    OK

  2. INSPECT FUEL INJECTOR ASSEMBLY (INJECTION AND VOLUME)


    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 fuel injector assembly connector.

    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
      C14-2 - C31-98 (#10) Always Below 1 Ω
      C15-2 - C31-95 (#20) Always Below 1 Ω
      C16-2 - C31-96 (#30) Always Below 1 Ω
      C17-2 - C31-97 (#40) Always Below 1 Ω
      C14-2 or C31-98 (#10) - Body ground and other terminals Always 10 kΩ or higher
      C15-2 or C31-95 (#20) - Body ground and other terminals Always 10 kΩ or higher
      C16-2 or C31-96 (#30) - Body ground and other terminals Always 10 kΩ or higher
      C17-2 or C31-97 (#40) - Body ground and other terminals 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 (NO. 1 INTEGRATION RELAY - FUEL INJECTOR ASSEMBLY)


    1. Disconnect the No. 1 integration relay 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
      1A-9 - C14-1 Always Below 1 Ω
      1A-9 - C15-1 Always Below 1 Ω
      1A-9 - C16-1 Always Below 1 Ω
      1A-9 - C17-1 Always Below 1 Ω
      1A-9 or C14-1 - Body ground and other terminals Always 10 kΩ or higher
      1A-9 or C15-1 - Body ground and other terminals Always 10 kΩ or higher
      1A-9 or C16-1 - Body ground and other terminals Always 10 kΩ or higher
      1A-9 or C17-1 - Body ground and other terminals Always 10 kΩ or higher

      Tech Tips

      If a short is detected in any of the above circuits, there may be a malfunction in the circuit of a connected ECU.

      Result
      Proceed to
      OK
      NG

    OK

    GO TO ECM POWER SOURCE CIRCUIT Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR