SFI SYSTEM > Fuel Injector Circuit

for Preparation Click here


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


A187735E01


INSPECTION PROCEDURE

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

1.INSPECT POWER SOURCE CIRCUIT


    A200903E08

  1. Disconnect the fuel injector connector.

  1. Turn the ignition switch to ON.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    C1-1 - Body ground
    		Ignition switch ON
    		11 to 14 V
    C2-1 - Body ground
    		Ignition switch ON
    		11 to 14 V
    C3-1 - Body ground
    		Ignition switch ON
    		11 to 14 V
    C8-1 - Body ground
    		Ignition switch ON
    		11 to 14 V

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Fuel Injector)

  1. Reconnect the fuel injector connector.



NG
Go to step 4
OK


2.INSPECT FUEL INJECTOR (INJECTION AND VOLUME)

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



NG
REPLACE FUEL INJECTOR (Click here)
OK


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

  1. Disconnect the ECM connector.

  1. Disconnect the fuel injector connector.

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

    Standard Resistance (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    C1-2 - B8-86 (#10)
    		Always
    		Below 1 Ω
    C2-2 - B8-85 (#20)
    		Always
    		Below 1 Ω
    C3-2 - B8-84 (#30)
    		Always
    		Below 1 Ω
    C8-2 - B8-83 (#40)
    		Always
    		Below 1 Ω

    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    C1-2 or B8-86 (#10) - Body ground
    		Always
    		10 kΩ or higher
    C2-2 or B8-85 (#20) - Body ground
    		Always
    		10 kΩ or higher
    C3-2 or B8-84 (#30) - Body ground
    		Always
    		10 kΩ or higher
    C8-2 or B8-83 (#40) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the fuel injector connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

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

4.CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - FUEL INJECTOR)

  1. Disconnect the fuel injector assembly connector.

  1. Remove the integration relay.

  1. Disconnect the integration relay connector.

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

    Standard Resistance (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    C1-1 - 1E-4
    		Always
    		Below 1 Ω
    C2-1 - 1E-4
    		Always
    		Below 1 Ω
    C3-1 - 1E-4
    		Always
    		Below 1 Ω
    C8-1 - 1E-4
    		Always
    		Below 1 Ω

    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    C1-1 or 1E-4 - Body ground
    		Always
    		10 kΩ or higher
    C2-1 or 1E-4 - Body ground
    		Always
    		10 kΩ or higher
    C3-1 or 1E-4 - Body ground
    		Always
    		10 kΩ or higher
    C8-1 or 1E-4 - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the fuel injector assembly connector.

  1. Reinstall the integration relay.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

CHECK ECM POWER SOURCE CIRCUIT (Click here)