Sfi System Fuel Injector Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK ECM (#10, #20, #30, #40 VOLTAGE)

INSPECT FUEL INJECTOR ASSEMBLY (RESISTANCE)

INSPECT FUSE (INJ)

CHECK HARNESS AND CONNECTOR OF MISFIRING CYLINDER (INJECTOR - ECM, INJECTOR - INJ FUSE)

CHECK HARNESS AND CONNECTOR (IGNITION SWITCH - INJ FUSE)

CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)

INSPECT FUEL INJECTOR ASSEMBLY (CHECK FUEL INJECTION VOLUME)

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


Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.2Tr-Fe Engine Control System.Sfi System.Sfi System Fuel Injector Circuit


INSPECTION PROCEDURE

1.CHECK ECM (#10, #20, #30, #40 VOLTAGE)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.2Tr-Fe Engine Control System.Sfi System.Sfi System Fuel Injector Circuit

  1. Turn the ignition switch ON.



  1. Measure the voltage of the ECM connectors.

    Standard voltage:
    Tester Connection
    		Specified Condition
    E10-6 (#10) - E11-7 (E01)
    		9 to 14 V
    E10-5 (#20) - E11-7 (E01)
    		9 to 14 V
    E10-2 (#30) - E11-7 (E01)
    		9 to 14 V
    E10-1 (#40) - E11-7 (E01)
    		9 to 14 V

    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.2Tr-Fe Engine Control System.Sfi System.Sfi System Fuel Injector Circuit

    HINT:
    Reference: Inspect using an oscilloscope.
    Check the waveform of the ECM connector.
    OK:
    Tester Connection
    		Specified Condition
    E10-6 (#10) - E11-7 (E01)
    		Correct waveform is as shown
    E10-5 (#20) - E11-7 (E01)
    		Correct waveform is as shown
    E10-2 (#30) - E11-7 (E01)
    		Correct waveform is as shown
    E10-1 (#40) - E11-7 (E01)
    		Correct waveform is as shown
    Tool Setting
    		Condition
    20 V/DIV., 100 or 1 msec./DIV.
    		Idling


OK
Go to step 6
NG


2.INSPECT FUEL INJECTOR ASSEMBLY (RESISTANCE)

  1. Inspect the fuel injector (Toyota Fortuner RM000000YL9005X.html).



NG
REPLACE FUEL INJECTOR ASSEMBLY
OK


3.INSPECT FUSE (INJ)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.2Tr-Fe Engine Control System.Sfi System.Sfi System Fuel Injector Circuit

  1. Remove the INJ fuse from the instrument panel junction block.

  1. Measure the resistance of the fuse.

    Standard resistance:
    Below 1 Ω


NG
CHECK FOR SHORT IN ALL HARNESSES AND COMPONENTS CONNECTED TO FUSE
OK


4.CHECK HARNESS AND CONNECTOR OF MISFIRING CYLINDER (INJECTOR - ECM, INJECTOR - INJ FUSE)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.2Tr-Fe Engine Control System.Sfi System.Sfi System Fuel Injector Circuit

  1. Check the wire harness between the injector and ECM.

    1. Disconnect the F4, F5, F6 and/or F7 injector connectors.

    2. Disconnect the E10 ECM connector.

    3. Measure the resistance of the wire harness side connectors.

      Standard resistance:
      Tester Connection
      		Specified Condition
      F4-2 - E10-6 (#10)
      		Below 1 Ω
      F5-2 - E10-5 (#20)
      		Below 1 Ω
      F6-2 - E10-2 (#30)
      		Below 1 Ω
      F7-2 - E10-1 (#40)
      		Below 1 Ω
      F4-2 or E10-6 (#10) - Body ground
      		10 kΩ or higher
      F5-2 or E10-5 (#20) - Body ground
      		10 kΩ or higher
      F6-2 or E10-2 (#30) - Body ground
      		10 kΩ or higher
      F7-2 or E10-1 (#40) - Body ground
      		10 kΩ or higher

  1. Check the wire harness between the injector and INJ fuse.

    1. Disconnect the F4, F5, F6 and F7 injector connectors.

    2. Remove the INJ fuse from the instrument panel junction block.

    3. Measure the resistance of the wire harness side connectors.

      Standard resistance:
      Tester Connection
      		Specified Condition
      F4-1 - J/B INJ fuse terminal 2
      		Below 1 Ω
      F5-1 - J/B INJ fuse terminal 2
      		Below 1 Ω
      F6-1 - J/B INJ fuse terminal 2
      		Below 1 Ω
      F7-1 - J/B INJ fuse terminal 2
      		Below 1 Ω
      F4-1 or J/B INJ fuse terminal 2 - Body ground
      		10 kΩ or higher
      F5-1 or J/B INJ fuse terminal 2 - Body ground
      		10 kΩ or higher
      F6-1 or J/B INJ fuse terminal 2 - Body ground
      		10 kΩ or higher
      F7-1 or J/B INJ fuse terminal 2 - Body ground
      		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.CHECK HARNESS AND CONNECTOR (IGNITION SWITCH - INJ FUSE)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.2Tr-Fe Engine Control System.Sfi System.Sfi System Fuel Injector Circuit

  1. Disconnect the I8 ignition switch connector.

  1. Remove the INJ fuse from the instrument panel junction block.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    I8-6 (IG2) - J/B INJ fuse terminal 1
    		Below 1 Ω
    I8-6 (IG2) or J/B INJ fuse terminal 1 - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

CHECK FOR ECM POWER SOURCE CIRCUIT

6.CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.2Tr-Fe Engine Control System.Sfi System.Sfi System Fuel Injector Circuit

  1. Disconnect the E11 ECM connector.

  1. Measure the resistance of the wire harness side connector.

    Standard resistance:
    Tester Connection
    		Specified Condition
    E11-7 (E01) - Body ground
    		Below 1 Ω
    E11-6 (E02) - Body ground
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


7.INSPECT FUEL INJECTOR ASSEMBLY (CHECK FUEL INJECTION VOLUME)

  1. Inspect the fuel injector (Toyota Fortuner RM000000YL9005X.html).



NG
REPLACE FUEL INJECTOR ASSEMBLY
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE