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

Refer to DTC P0300 Click here.

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. CHECK INJECTOR ASSEMBLY (POWER SOURCE)

    A01EQCFE05

    1. Disconnect the fuel injector connector.

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

      Standard Voltage
      Cylinder Tester Connection Switch Condition Specified Condition
      No. 1 a5-2 - Body ground Engine switch on (IG) 11 to 14 V
      No. 2 a1-2 - Body ground Engine switch on (IG) 11 to 14 V
      No. 3 a6-2 - Body ground Engine switch on (IG) 11 to 14 V
      No. 4 a2-2 - Body ground Engine switch on (IG) 11 to 14 V
      No. 5 a7-2 - Body ground Engine switch on (IG) 11 to 14 V
      No. 6 a3-2 - Body ground Engine switch on (IG) 11 to 14 V
      No. 7 a8-2 - Body ground Engine switch on (IG) 11 to 14 V
      No. 8 a4-2 - Body ground Engine switch on (IG) 11 to 14 V

    NG

    INSPECT INTEGRATION RELAY (IG2) Click here

    OK

  2. INSPECT FUEL INJECTOR ASSEMBLY


    1. Inspect the fuel injector Click here.


    NG

    REPLACE FUEL INJECTOR ASSEMBLY Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (FUEL INJECTOR ASSEMBLY - ECM)


    1. Disconnect the fuel injector connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance
      for LHD
      Cylinder Tester Connection Condition Specified Condition
      No. 1 a5-1 - Body ground Always 10 kΩ or higher
      a5-1 - C53-86 (#10) Always Below 1 Ω
      No. 2 a1-1 - Body ground Always 10 kΩ or higher
      a1-1 - C53-109 (#20) Always Below 1 Ω
      No. 3 a6-1 - Body ground Always 10 kΩ or higher
      a6-1 - C53-85 (#30) Always Below 1 Ω
      No. 4 a2-1 - Body ground Always 10 kΩ or higher
      a2-1 - C53-108 (#40) Always Below 1 Ω
      No. 5 a7-1 - Body ground Always 10 kΩ or higher
      a7-1 - C53-84 (#50) Always Below 1 Ω
      No. 6 a3-1 - Body ground Always 10 kΩ or higher
      a3-1 - C53-107 (#60) Always Below 1 Ω
      No. 7 a8-1 - Body ground Always 10 kΩ or higher
      a8-1 - C53-83 (#70) Always Below 1 Ω
      No. 8 a4-1 - Body ground Always 10 kΩ or higher
      a4-1 - C53-106 (#80) Always Below 1 Ω
      for RHD
      Cylinder Tester Connection Condition Specified Condition
      No. 1 a5-1 - Body ground Always 10 kΩ or higher
      a5-1 - C54-86 (#10) Always Below 1 Ω
      No. 2 a1-1 - Body ground Always 10 kΩ or higher
      a1-1 - C54-109 (#20) Always Below 1 Ω
      No. 3 a6-1 - Body ground Always 10 kΩ or higher
      a6-1 - C54-85 (#30) Always Below 1 Ω
      No. 4 a2-1 - Body ground Always 10 kΩ or higher
      a2-1 - C54-108 (#40) Always Below 1 Ω
      No. 5 a7-1 - Body ground Always 10 kΩ or higher
      a7-1 - C54-84 (#50) Always Below 1 Ω
      No. 6 a3-1 - Body ground Always 10 kΩ or higher
      a3-1 - C54-107 (#60) Always Below 1 Ω
      No. 7 a8-1 - Body ground Always 10 kΩ or higher
      a8-1 - C54-83 (#70) Always Below 1 Ω
      No. 8 a4-1 - Body ground Always 10 kΩ or higher
      a4-1 - C54-106 (#80) Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here

  4. INSPECT INTEGRATION RELAY (IG2)


    1. Inspect the integration relay (IG2) Click here.


    NG

    REPLACE INTEGRATION RELAY

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (INTEGRATION RELAY - FUEL INJECTOR ASSEMBLY)