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

INSPECTION PROCEDURE

PROCEDURE

1. CHECK INJECTOR ASSEMBLY (POWER SOURCE)

   
   

   1. 

      Disconnect the injector assembly connector.

   2. Turn the ignition switch on (IG).

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition B13-2 - Body ground Ignition switch on (IG) 9 to 14 V B14-2 - Body ground Ignition switch on (IG) 9 to 14 V B15-2 - Body ground Ignition switch on (IG) 9 to 14 V B16-2 - Body ground Ignition switch on (IG) 9 to 14 V B17-2 - Body ground Ignition switch on (IG) 9 to 14 V B18-2 - Body ground Ignition switch on (IG) 9 to 14 V

   4. Turn the ignition switch off.

   5. Reconnect the injector assembly connector.

   
   

   NG

   INSPECT FUSE (INJ NO. 2 FUSE) Click here

   OK

2. INSPECT INJECTOR ASSEMBLY

   
   

   1. Inspect the injector assembly Click here.

   
   

   NG

   REPLACE INJECTOR ASSEMBLY Click here

   OK

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

   
   

   1. 

      Disconnect the injector connector (of the misfiring cylinder).

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

      Standard voltage

      Cylinder Tester Connection Switch Condition Specified Condition No. 1 B13-2 - Body ground Ignition switch on (IG) 11 to 14 V No. 2 B14-2 - Body ground Ignition switch on (IG) 11 to 14 V No. 3 B15-2 - Body ground Ignition switch on (IG) 11 to 14 V No. 4 B16-2 - Body ground Ignition switch on (IG) 11 to 14 V No. 5 B17-2 - Body ground Ignition switch on (IG) 11 to 14 V No. 6 B18-2 - Body ground Ignition switch on (IG) 11 to 14 V

   
   

   NG

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

   OK

   REPLACE ECM Click here

4. INSPECT FUSE (INJ NO. 2 FUSE)

   
   

   1. 

      Remove the INJ No. 2 fuse from engine room relay block.

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

      Standard resistance
      Tester Connection Condition Specified Condition INJ No. 2 fuse Always Below 1 Ω

   3. Reinstall the INJ No. 2 fuse.

   
   

   NG

   REPLACE FUSE

   OK

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