Sfi System Fuel Pump Control Circuit

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK FUEL PUMP OPERATION

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

INSPECT ECM POWER SOURCE CIRCUIT

INSPECT FUSE (F/PMP FUSE)

INSPECT INTEGRATION RELAY (EFI NO. 2 RELAY)

INSPECT INTEGRATION RELAY (C/OPN RELAY)

INSPECT ECM (FC VOLTAGE)

INSPECT F/PMP RELAY

INSPECT FUEL PUMP

CHECK HARNESS AND CONNECTOR (FUEL PUMP - F/PMP RELAY)

CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - F/PMP RELAY)

INSPECT F/PMP RELAY

INSPECT FUEL PUMP RESISTOR

CHECK HARNESS AND CONNECTOR (F/PMP RELAY - FUEL PUMP RESISTER)

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 engine switch on (IG) and turn the intelligent tester ON.
   

3. Enter the following menus: Power train / Engine / Active Test / Control the Fuel Pump / Speed.
   

4. Check the operation of the relay while operating it using the intelligent tester.
   

   OK:

   Operating noise can be heard from the relay.
   

1. Remove the F/PMP fuse from the engine room No. 2 relay block, junction block.
   

2. Measure the resistance of the F/PMP fuse.
   

   Standard resistance:

   Below 1 Ω
   

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

2. Measure the resistance of the EFI NO. 2 relay.
   

   Standard resistance:

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

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

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

   Standard resistance:

   Tester Connection	Specified Condition
   2B-6 - 2B-8	10 kΩ or higher
   2B-6 - 2B-8	Below 1 Ω (when battery voltage applied to terminals 2B-6 and 2B-7)

1. Turn the engine switch on (IG).
   

2. Measure the voltage between the terminals of the A6 and E7 ECM connectors.
   

   Standard voltage:

   Tester Connection	Specified Condition
   FC (A6-14) - E1 (E7-7)	9 to 14 V

1. Remove the F/PMP relay from the engine room No. 2 relay block.
   

2. Measure the resistance of the F/PMP relay.
   

   Standard resistance:

   Tester Connection	Specified Condition
   3 - 4	10 kΩ or higher
   3 - 4	Below 1 Ω (when battery voltage 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 the 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 fuel pump as far away from the battery as possible.
         
      3. Always switch at the battery side.
         

1. Check the harness and the connectors between the fuel pump and the F/PMP relay.
   

   1. Disconnect the W11 fuel pump connector.
      

   2. Remove the F/PMP relay from the engine room No. 2 relay block.
      

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

      Standard resistance (Check for open):

      Tester Connection	Specified Condition
      Fuel pump (W11-4) - F/PMP relay (4)	Below 1 Ω

      Standard resistance (Check for short):

      Tester Connection	Specified Condition
      Fuel pump (W11-4) or F/PMP (4) - Body ground	10 kΩ or higher

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

   1. Disconnect the fuel pump connector.
      

   2. Measure the resistance of the wire harness side connector and the body ground.
      

      Standard resistance (Check for open):

      Tester Connection	Specified Condition
      Fuel pump (W11-5) - Body ground	10 kΩ or higher

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

2. Remove the F/PMP relay from the engine room No. 2 junction block.
   

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

   Standard resistance (Check for open):

   Tester Connection	Specified Condition
   Integration relay (2B-8) - F/PMP relay (1)	Below 1 Ω
   Integration relay (2B-8) - F/PMP relay (3)	Below 1 Ω

   Standard resistance (Check for short):

   Tester Connection	Specified Condition
   Circuit opening relay (2B-8) or F/PMP relay (1) - Body ground	10 kΩ or higher
   Circuit opening relay (2B-8) or F/PMP relay (3) - Body ground	10 kΩ or higher

1. Remove the F/PMP relay from the engine room No. 2 relay block.
   

2. Measure the resistance of the F/PMP relay.
   

   Standard resistance:

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

1. Measure the resistance between terminals.
   

   Standard resistance:

   0.70 to 0.76 Ω at 20°C (68°F)
   

1. Check the harness and the connectors between the F/PMP relay and the fuel pump resistor.
   

   1. Remove the F/PMP relay from the engine room No. 2 relay block.
      

   2. Disconnect the A25 fuel pump resistor connector.
      

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

      Standard resistance (Check for open):

      Tester Connection	Specified Condition
      F/PMP relay (4) - Fuel pump resistor (A25-2)	Below 1 Ω
      F/PMP relay (3) - Fuel pump resistor (A25-1)	Below 1 Ω

      Standard resistance (Check for short):

      Tester Connection	Specified Condition
      Fuel pump relay (4) or Fuel pump resistor (A25-2) - Body ground	10 kΩ or higher
      Fuel pump relay (4) or Fuel pump resistor (A25-1) - Body ground	10 kΩ or higher