SFI SYSTEM (w/o EGR System) Fuel Injector Circuit

DESCRIPTION

The fuel injector assemblies are located on the intake manifold. They inject fuel into the cylinders based on signals from the ECM.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. CHECK FUEL INJECTOR ASSEMBLY (POWER SOURCE)

   
   
   1. 

      Text in Illustration

      *1	Front view of wire harness connector (to Fuel Injector Assembly)

      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 Switch Condition Specified Condition D13-2 - Body ground Power switch on (IG) 11 to 14 V D14-2 - Body ground Power switch on (IG) 11 to 14 V D15-2 - Body ground Power switch on (IG) 11 to 14 V D16-2 - Body ground Power switch on (IG) 11 to 14 V D17-2 - Body ground Power switch on (IG) 11 to 14 V D18-2 - Body ground Power switch on (IG) 11 to 14 V

   4. Reconnect the fuel injector assembly connector.

   
   

   NG

   CHECK HARNESS AND CONNECTOR (IG2 RELAY - FUEL INJECTOR ASSEMBLY) Click here

   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 connector.

   2. Disconnect the ECM connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition D13-1 - D1-19 (#10) Always Below 1 Ω D14-1 - D1-20 (#20) Always Below 1 Ω D15-1 - D1-53 (#30) Always Below 1 Ω D16-1 - D1-49 (#40) Always Below 1 Ω D17-1 - D1-21 (#50) Always Below 1 Ω D18-1 - D1-52 (#60) Always Below 1 Ω

      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition D13-1 or D1-19 (#10) - Body ground Always 10 kΩ or higher D14-1 or D1-20 (#20) - Body ground Always 10 kΩ or higher D15-1 or D1-53 (#30) - Body ground Always 10 kΩ or higher D16-1 or D1-49 (#40) - Body ground Always 10 kΩ or higher D17-1 or D1-21 (#50) - Body ground Always 10 kΩ or higher D18-1 or D1-52 (#60) - Body ground Always 10 kΩ or higher

   4. Reconnect the ECM connector.

   5. Reconnect the fuel injector assembly connector.

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL INJECTOR ASSEMBLY - ECM)

   OK

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

4. CHECK HARNESS AND CONNECTOR (IG2 RELAY - FUEL INJECTOR ASSEMBLY)

   
   

   1. Disconnect the fuel injector assembly connector.

   2. Remove the IG2 relay from the engine room relay block.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition D13-2 - 3 (IG2 relay terminal) Always Below 1 Ω D14-2 - 3 (IG2 relay terminal) Always Below 1 Ω D15-2 - 3 (IG2 relay terminal) Always Below 1 Ω D16-2 - 3 (IG2 relay terminal) Always Below 1 Ω D17-2 - 3 (IG2 relay terminal) Always Below 1 Ω D18-2 - 3 (IG2 relay terminal) Always Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition D13-2 or 3 (IG2 relay terminal) - Body ground Always 10 kΩ or higher D14-2 or 3 (IG2 relay terminal) - Body ground Always 10 kΩ or higher D15-2 or 3 (IG2 relay terminal) - Body ground Always 10 kΩ or higher D16-2 or 3 (IG2 relay terminal) - Body ground Always 10 kΩ or higher D17-2 or 3 (IG2 relay terminal) - Body ground Always 10 kΩ or higher D18-2 or 3 (IG2 relay terminal) - Body ground Always 10 kΩ or higher

   4. Reinstall the IG2 relay.

   5. Reconnect the fuel injector assembly connector.

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR (IG2 RELAY - FUEL INJECTOR ASSEMBLY)

   OK

   CHECK ECM POWER SOURCE CIRCUIT Click here