Sfi System Fuel Pump Control Circuit

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK FUEL PUMP OPERATION

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (OPERATE CIRCUIT OPENING RELAY)

INSPECT INTEGRATION NO.1 RELAY (C/OPN RELAY)

CHECK ECM (FC VOLTAGE)

INSPECT ECM POWER SOURCE CIRCUIT

INSPECT FUEL PUMP RELAY (Marking: F/PMP)

INSPECT FUEL PUMP

CHECK WIRE HARNESS (FUEL PUMP - BODY GROUND, FUEL PUMP RELAY (Marking: F/PMP))

CHECK WIRE HARNESS (INTEGRATION RELAY - FUEL PUMP RELAY (Marking: F/PMP))

INSPECT FUEL PUMP RELAY (Marking: F/PMP)

INSPECT FUEL PUMP RESISTOR (RESISTANCE)

CHECK WIRE HARNESS (FUEL PUMP RELAY (Marking: F/PMP) - FUEL PUMP RESISTOR, FUEL PUMP RESISTOR - FUEL PUMP)

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

1. Check if there is pressure in the fuel inlet hose.
   

   HINT:

   If there is fuel pressure, you will hear the sound of fuel flowing.

1. Connect the intelligent tester to the DLC3.
   

2. Turn the ignition switch ON and turn the tester ON.
   

3. Enter the following menus: Powertrain / Engine and ECT / Active Test / Fuel Pump / Speed.
   

4. Check whether operating sounds can be heard while operating the relay using the intelligent tester.
   

   OK:

   Operating noise can be heard from the relay.
   

1. Disconnect the integration relay from the engine room junction block (Toyota Fortuner RM0000014TJ00HX.html).
   

2. Measure the voltage of the C/OPN relay.
   

   Standard voltage:

   Terminal Connection	Condition	Specified Condition
   1J-8 - Body ground	Ignition switch ON	10 to 14 V

1. Turn the ignition switch ON.
   

2. Measure the voltage of the ECM connectors.
   

   Standard voltage:

   Tester Connection	Specified Condition
   E14-10 (FC) - E17-1 (E1)	9 to 14 V

1. Remove the relay from the engine room relay block.
   

2. Measure the resistance of the relay.
   

   Standard resistance:

   Tester Connection	Specified Condition
   3 - 4	Below 1 Ω
   3 - 5	10 kΩ or higher
   3 - 4	10 kΩ or higher (when battery voltage is applied to terminals 1 and 2)
   3 - 5	Below 1 Ω (when battery voltage is applied to terminals 1 and 2)

1. Inspect fuel pump resistance.
   

   1. Measure the resistance between terminals 4 and 5.
      

      Standard resistance:

      0.2 to 3.0 Ω at 20°C (68°F)
      

2. Inspect fuel pump operation.
   

   1. Apply battery voltage to both terminals. Check that the pump operates.
      

NOTICE:

1. These tests must be done quickly (within 10 seconds) to prevent the coil from burning out.
   
2. Keep the fuel pump as far away from the battery as possible.
   
3. Always perform the switching at the battery side.
   

1. Check the wire harness between the fuel pump and fuel pump relay.
   

   1. Disconnect the F14 fuel pump connector.
      

   2. Remove the fuel pump relay from the engine room relay block.
      

   3. Measure the resistance of the wire harness side connectors.
      

      Standard resistance:

      Tester Connection	Specified Condition
      F14-5 - Body ground	Below 1 Ω
      F14-4 or Relay block fuel pump relay terminal 4 - Body ground	10 kΩ or higher

2. Check the wire harness between the fuel pump and body ground.
   

   1. Disconnect the F14 fuel pump connector.
      

   2. Measure the resistance of the wire harness side connector.
      

      Standard resistance:

      Tester Connection	Specified Condition
      F14-5 - Body ground	Below 1 Ω

1. Disconnect the 1J integration relay connector from the engine room junction block (Toyota Fortuner RM0000014TJ00HX.html).
   

2. Remove the fuel pump relay from the engine room relay block.
   

3. Measure the resistance of the wire harness side connectors.
   

   Standard resistance:

   Tester Connection	Specified Condition
   1J-8 - Relay block fuel pump relay terminal 3	Below 1 Ω
   1J-8 or Relay block fuel pump relay terminal 3 - Body ground	10 kΩ or higher

1. Remove the relay from the engine room relay block.
   

2. Measure the resistance of the relay.
   

   Standard resistance:

   Tester Connection	Specified Condition
   3 - 4	Below 1 Ω
   3 - 5	10 kΩ or higher
   3 - 4	10 kΩ or higher (when battery voltage is applied to terminals 1 and 2)
   3 - 5	Below 1 Ω (when battery voltage is applied to terminals 1 and 2)

1. Inspect the fuel pump resistor resistance.
   

   1. Measure the resistance.
      

      Standard resistance:

      0.70 to 0.76 Ω at 20°C (68°F)
      

1. Check the wire harness between the fuel pump relay and fuel pump resistor.
   

   1. Remove the fuel pump relay from the engine room relay block.
      

   2. Disconnect the F17 fuel pump resistor connector.
      

   3. Measure the resistance of the wire harness side connectors.
      

      Standard resistance:

      Tester Connection	Specified Condition
      Relay block fuel pump relay terminal 5 - F17-1 (+B)	Below 1 Ω
      Relay block fuel pump relay terminal 5 or F17-1 (+B) - Body ground	10 kΩ or higher

2. Check the wire harness between the fuel pump resistor and fuel pump.
   

   1. Disconnect the F17 fuel pump resistor connector.
      

   2. Disconnect the F14 fuel pump connector.
      

   3. Measure the resistance of the wire harness side connectors.
      

      Standard resistance:

      Tester Connection	Specified Condition
      F17-2 (FP) - F14-4	Below 1 Ω
      F17-2 (FP) or F14-4 - Body ground	10 kΩ or higher