SFI SYSTEM Fuel Injector Circuit

DESCRIPTION

The fuel injectors are located on the intake port. They inject fuel into the cylinders based on the signals from the ECM.

CAUTION / NOTICE / HINT

PROCEDURE

1. Click here

   CHECK TERMINAL VOLTAGE (POWER SOURCE OF FUEL INJECTOR ASSEMBLY)

   
   
   1. 

      Disconnect the fuel injector assembly connectors.

   2. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition D26-1 - Body ground Power switch on (IG) 11 to 14 V D30-1 - Body ground Power switch on (IG) 11 to 14 V D27-1 - Body ground Power switch on (IG) 11 to 14 V D31-1 - Body ground Power switch on (IG) 11 to 14 V

      Table 1. Text in Illustration

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

   
   
   • OKClick here
   • NGClick here
2. Click here

   INSPECT FUEL INJECTOR ASSEMBLY

   
   

   1. Check the fuel injector assembly (Click here).

      Tip:

      Perform "Inspection After Repair" after replacing the fuel injector assembly (Click here).

   
   
   • OKClick here
   • NG

     REPLACE FUEL INJECTOR ASSEMBLY (Click here)

3. Click here

   CHECK HARNESS AND CONNECTOR (FUEL INJECTOR ASSEMBLY - ECM)

   
   

   1. Disconnect the fuel injector assembly connectors.

   2. Disconnect the ECM connector.

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

      Standard Resistance

      Tester Connection Condition Specified Condition D26-2 - D24-20 (#10) Always Below 1 Ω D30-2 - D24-17 (#20) Always Below 1 Ω D27-2 - D24-18 (#30) Always Below 1 Ω D31-2 - D24-19 (#40) Always Below 1 Ω D26-2 or D24-20 (#10) - Body ground Always 10 kΩ or higher D30-2 or D24-17 (#20) - Body ground Always 10 kΩ or higher D27-2 or D24-18 (#30) - Body ground Always 10 kΩ or higher D31-2 or D24-19 (#40) - Body ground Always 10 kΩ or higher

   
   
   • OK

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

   • NG

     REPAIR OR REPLACE HARNESS OR CONNECTOR

4. Click here

   CHECK HARNESS AND CONNECTOR (FUEL INJECTOR ASSEMBLY - NO. 1 INTEGRATION RELAY)

   
   

   1. Disconnect the fuel injector assembly connectors.

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition D26-1 - 1A-3 Always Below 1 Ω D30-1 - 1A-3 Always Below 1 Ω D27-1 - 1A-3 Always Below 1 Ω D31-1 - 1A-3 Always Below 1 Ω D26-1 or 1A-3 - Body ground Always 10 kΩ or higher D30-1 or 1A-3 - Body ground Always 10 kΩ or higher D27-1 or 1A-3 - Body ground Always 10 kΩ or higher D31-1 or 1A-3 - Body ground Always 10 kΩ or higher

   
   
   • OK

     CHECK ECM POWER SOURCE CIRCUIT (Click here)

   • NG

     REPAIR OR REPLACE HARNESS OR CONNECTOR