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


A231569E07


INSPECTION PROCEDURE

1.CHECK FUEL INJECTOR ASSEMBLY (POWER SOURCE VOLTAGE)


    A194105E75

  1. Disconnect the fuel injector assembly connectors.

  1. Turn the power switch on (IG).

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D14-1 - Body ground
    		Power switch on (IG)
    		11 to 14 V
    D15-1 - Body ground
    		Power switch on (IG)
    		11 to 14 V
    D16-1 - Body ground
    		Power switch on (IG)
    		11 to 14 V
    D17-1 - Body ground
    		Power switch on (IG)
    		11 to 14 V

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



NG
Go to step 4
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 ASSEMBLY - ECM)

  1. Disconnect the fuel injector assembly connectors.

  1. Disconnect the ECM connector.

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

    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    D14-2 - D27-85 (#10)
    		Always
    		Below 1 Ω
    D15-2 - D27-84 (#20)
    		Always
    		Below 1 Ω
    D16-2 - D27-83 (#30)
    		Always
    		Below 1 Ω
    D17-2 - D27-82 (#40)
    		Always
    		Below 1 Ω
    D14-2 or D27-85 (#10) - Body ground
    		Always
    		10 Ω or higher
    D15-2 or D27-84 (#20) - Body ground
    		Always
    		10 Ω or higher
    D16-2 or D27-83 (#30) - Body ground
    		Always
    		10 Ω or higher
    D17-2 or D27-82 (#40) - Body ground
    		Always
    		10 Ω or higher



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 (NO. 2 INTEGRATION RELAY (IG2 RELAY) - FUEL INJECTOR ASSEMBLY)

  1. Disconnect the fuel injector assembly connectors.

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

  1. Disconnect the No. 2 integration relay connector.

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

    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    D14-1 - 1A-4
    		Always
    		Below 1 Ω
    D15-1 - 1A-4
    		Always
    		Below 1 Ω
    D16-1 - 1A-4
    		Always
    		Below 1 Ω
    D17-1 - 1A-4
    		Always
    		Below 1 Ω
    D14-1 or 1A-4 - Body ground
    		Always
    		10 kΩ or higher
    D15-1 or 1A-4 - Body ground
    		Always
    		10 kΩ or higher
    D16-1 or 1A-4 - Body ground
    		Always
    		10 kΩ or higher
    D17-1 or 1A-4 - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

CHECK ECM POWER SOURCE CIRCUIT (Click here)