SFI SYSTEM Fuel Injector Circuit

DESCRIPTION

They inject fuel into the cylinders based on signals from the ECM.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

1. CHECK TERMINAL VOLTAGE (POWER SOURCE OF FUEL INJECTOR ASSEMBLY)

   

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

   
   

   1. 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 D1-2 - Body ground Ignition switch ON 11 to 14 V D2-2 - Body ground Ignition switch ON 11 to 14 V D3-2 - Body ground Ignition switch ON 11 to 14 V D4-2 - Body ground Ignition switch ON 11 to 14 V

      Result
      Proceed to OK NG

   
   

   NG

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

   OK

2. INSPECT FUEL INJECTOR ASSEMBLY (INJECTION AND VOLUME)

   
   

   1. Inspect the fuel injector assembly.

      Click here

      Tech Tips

      Perform "Inspection After Repair" after replacing the fuel injector assembly.

      Click here

      Result
      Proceed to OK NG

   
   

   NG

   REPLACE FUEL INJECTOR ASSEMBLY Click here

   OK

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

   
   

   1. Disconnect the D1, D2, D3 and D4 fuel injector assembly connectors.

   2. Disconnect the B112 ECM connector.*1

   3. Disconnect the B118 ECM connector.*2

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

      *1: for LHD

      *2: for RHD

      Standard Resistance
      for LHD Tester Connection Condition Specified Condition B112-98 (#10) - D1-1 Always Below 1 Ω B112-95 (#20) - D2-1 Always Below 1 Ω B112-96 (#30) - D3-1 Always Below 1 Ω B112-97 (#40) - D4-1 Always Below 1 Ω B112-98 (#10) or D1-1 - Body ground and other terminals Always 10 kΩ or higher B112-95 (#20) or D2-1 - Body ground and other terminals Always 10 kΩ or higher B112-96 (#30) or D3-1 - Body ground and other terminals Always 10 kΩ or higher B112-97 (#40) or D4-1 - Body ground and other terminals Always 10 kΩ or higher
      for RHD Tester Connection Condition Specified Condition B118-98 (#10) - D1-1 Always Below 1 Ω B118-95 (#20) - D2-1 Always Below 1 Ω B118-96 (#30) - D3-1 Always Below 1 Ω B118-97 (#40) - D4-1 Always Below 1 Ω B118-98 (#10) or D1-1 - Body ground and other terminals Always 10 kΩ or higher B118-95 (#20) or D2-1 - Body ground and other terminals Always 10 kΩ or higher B118-96 (#30) or D3-1 - Body ground and other terminals Always 10 kΩ or higher B118-97 (#40) or D4-1 - Body ground and other terminals Always 10 kΩ or higher

      Result
      Proceed to OK NG

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

4. CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)

   
   

   1. Disconnect the B112 ECM connector.*1

   2. Disconnect the B118 ECM connector.*2

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

      *1: for LHD

      *2: for RHD

      Standard Resistance
      for LHD Tester Connection Condition Specified Condition B112-57 (E01) - Body ground Always Below 1 Ω B112-58 (E02) - Body ground Always Below 1 Ω
      for RHD Tester Connection Condition Specified Condition B118-57 (E01) - Body ground Always Below 1 Ω B118-58 (E02) - Body ground Always Below 1 Ω

      Result
      Proceed to OK NG

   
   

   OK

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

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

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

   
   

   1. Disconnect the No. 1 integration relay connector.

   2. Disconnect the D1, D2, D3 and D4 fuel injector assembly connectors.

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

      Standard Resistance

      Tester Connection Condition Specified Condition 1E-2 - D1-2 Always Below 1 Ω 1E-2 - D2-2 Always Below 1 Ω 1E-2 - D3-2 Always Below 1 Ω 1E-2 - D4-2 Always Below 1 Ω 1E-2 or D1-2 - Body ground and other terminals Always 10 kΩ or higher 1E-2 or D2-2 - Body ground and other terminals Always 10 kΩ or higher 1E-2 or D3-2 - Body ground and other terminals Always 10 kΩ or higher 1E-2 or D4-2 - Body ground and other terminals Always 10 kΩ or higher

      Result
      Proceed to OK NG

   
   

   OK

   CHECK ECM POWER SOURCE CIRCUIT Click here

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR