SFI SYSTEM Fuel Injector Circuit

DESCRIPTION

The fuel injectors (for port injection) are attached to the intake manifold, and inject fuel into the intake manifold based on the ECM signals.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

1. INSPECT FUEL INJECTOR ASSEMBLY (POWER SOURCE)

   
   
   1. 

      Text in Illustration

      *a	Front view of wire harness connector (to Fuel Injector Assembly)
      *b	No. 1 cylinder
      *c	No. 2 cylinder
      *d	No. 3 cylinder
      *e	No. 4 cylinder

      Disconnect the fuel injector assembly connectors.

   2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition C8-1 - Body ground Ignition switch ON 11 to 14 V C30-1 - Body ground Ignition switch ON 11 to 14 V C9-1 - Body ground Ignition switch ON 11 to 14 V C31-1 - Body ground Ignition switch ON 11 to 14 V

   
   

   NG

   CHECK HARNESS AND CONNECTOR (FUEL INJECTOR ASSEMBLY - EFI MAIN1 RELAY) Click here

   OK

2. INSPECT FUEL INJECTOR ASSEMBLY (INJECTION AND VOLUME)

   
   

   1. Check the fuel injector injection and volume 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 C8-2 - A36-12 (#10) Always Below 1 Ω C30-2 - A36-22 (#20) Always Below 1 Ω C9-2 - A36-32 (#30) Always Below 1 Ω C31-2 - A36-13 (#40) Always Below 1 Ω

      Standard Resistance (Check for short)
      Tester Connection Condition Specified Condition C1-2 or A36-12 (#10) - Body ground Always 10 kΩ or higher C2-2 or A36-22 (#20) - Body ground Always 10 kΩ or higher C3-2 or A36-32 (#30) - Body ground Always 10 kΩ or higher C8-2 or A36-13 (#40) - Body ground Always 10 kΩ or higher

   
   

   OK

   REPLACE ECM Click here

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

4. CHECK HARNESS AND CONNECTOR (FUEL INJECTOR ASSEMBLY - EFI MAIN1 RELAY)

   
   

   1. Disconnect the fuel injector assembly connector.

   2. Remove the EFI MAIN1 relay from the engine room relay block assembly.

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

      Standard Resistance (Check for open)
      Tester Connection Condition Specified Condition C8-1 - EFI MAIN1 relay terminal 3 Always Below 1 Ω C30-1 - EFI MAIN1 relay terminal 3 Always Below 1 Ω C9-1 - EFI MAIN1 relay terminal 3 Always Below 1 Ω C31-1 - EFI MAIN1 relay terminal 3 Always Below 1 Ω

      Standard Resistance (Check for short)
      Tester Connection Condition Specified Condition C8-1 or EFI MAIN1 relay terminal 3 - Body ground Always 10 kΩ or higher C30-1 or EFI MAIN1 relay terminal 3 - Body ground Always 10 kΩ or higher C9-1 or EFI MAIN1 relay terminal 3 - Body ground Always 10 kΩ or higher C31-1 or EFI MAIN1 relay terminal 3 - Body ground Always 10 kΩ or higher

   
   

   OK

   CHECK ECM POWER SOURCE CIRCUIT Click here

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR