Sfi System Fuel Pump Control Circuit

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM ACTIVE TEST USING GTS (CONTROL THE FUEL PUMP/SPEED)

INSPECT FUEL PUMP ECU (POWER SOURCE VOLTAGE)

CHECK HARNESS AND CONNECTOR (FUEL PUMP ECU - BODY GROUND)

CHECK HARNESS AND CONNECTOR (FUEL PUMP - FUEL PUMP ECU)

INSPECT FUEL PUMP

CHECK HARNESS AND CONNECTOR (FUEL PUMP ECU - ECM)

REPLACE FUEL PUMP ECU

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - FUEL PUMP ECU)

INSPECT INTEGRATION RELAY (FUEL PMP)

PERFORM ACTIVE TEST USING GTS (CONTROL THE FUEL PUMP)

CHECK HARNESS AND CONNECTOR (FUEL PUMP ECU - ECM)

REPLACE FUEL PUMP

REPLACE FUEL PUMP ECU

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

DESCRIPTION

WIRING DIAGRAM

1. for LHD:
   

1. for RHD:
   

INSPECTION PROCEDURE

NOTICE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

1. Connect the GTS to the DLC3.
   

2. Turn the ignition switch to ON.
   

3. Turn the GTS on.
   

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

5. Check whether operating sounds can be heard while operating the fuel pump using the GTS.
   

   OK:

   Operating sounds can be heard from fuel pump.
   

   Result

   Result	Proceed to
   NG	A
   OK	B

1. Disconnect the fuel pump ECU connector.
   

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
   N14-6 (+B) - Body Ground	Ignition switch ON	11 to 14 V

   Text in Illustration

   *a	Front view of wire harness connector (to Fuel Pump ECU)

1. Disconnect the fuel pump ECU connector.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   N14-3 (E) - Body ground	Always	Below 1 Ω

1. Disconnect the fuel pump connector.
   

2. Disconnect the fuel pump ECU connector.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   N1-4 (B2) - N14-1 (FP)	Always	Below 1 Ω
   N1-5 (E2) - N14-2 (FP-)	Always	Below 1 Ω
   N1-4 (B2) or N14-1 (FP) - Body ground	Always	10 kΩ or higher
   N1-5 (E2) or N14-2 (FP-) - Body ground	Always	10 kΩ or higher

1. Inspect the fuel pump (Click here).
   

1. Disconnect the fuel pump ECU connector.
   

2. Disconnect the ECM connector.
   

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

   Standard Resistance:

   for LHD

   Tester Connection	Condition	Specified Condition
   N14-5 (FPC) - A38-52 (FPC)	Always	Below 1 Ω
   N14-5 (FPC) or A38-52 (FPC) - Body ground	Always	10 kΩ or higher

   for RHD

   Tester Connection	Condition	Specified Condition
   N14-5 (FPC) - A52-52 (FPC)	Always	Below 1 Ω
   N14-5 (FPC) or A52-52 (FPC) - Body ground	Always	10 kΩ or higher

1. Replace the fuel pump ECU (Click here).
   

1. Check the fuel pump operation.
   

   OK:

   Malfunction has been repaired successfully.
   

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

2. Disconnect the fuel pump ECU connector.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   1R-6 - N14-6 (+B)	Always	Below 1 Ω
   1R-6 or N14-6 (+B) - Body ground	Always	10 kΩ or higher

1. Inspect the integration relay (FUEL PMP) (Click here).
   

1. Remove the fuel tank assembly (Click here).
   

2. Remove the fuel pump from the fuel tank assembly.
   

3. Clean the fuel pump to completely remove any remaining fuel.
   

4. Connect the fuel pump connector.
   

   CAUTION:

   Make sure that there is no fuel remaining inside or on the outside of the fuel pump.

5. Connect the GTS to the DLC3.
   

6. Turn the ignition switch to ON.
   

7. Turn the GTS on.
   

8. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Fuel Pump Duty.
   

9. Operate the fuel pump using the Active Test function and measure the voltage according to the value(s) in the table below.
   

   Standard Voltage:

   Tester Connection	GTS Operation	Specified Condition
   1 - 2	FPC Duty: 25%	3.2 to 4.05 V
   	FPC Duty: 80%	8.8 to 12.5 V

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

11. Operate the fuel pump using the Active Test function and measure the voltage according to the value(s) in the table below.
    

    Standard Voltage:

    Tester Connection	GTS Operation	Specified Condition
    1 - 2	ON (FPC Duty: 90%)	9.0 to 14.0 V

    HINT:

    1. Be sure to measure the voltage with all the connectors connected.
       
    2. Before performing this inspection, check that the battery voltage is between 11 and 14 V (not depleted).
       

1. Disconnect the fuel pump ECU connector.
   

2. Disconnect the ECM connector.
   

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

   Standard Resistance:

   for LHD

   Tester Connection	Condition	Specified Condition
   N14-5 (FPC) - A38-52 (FPC)	Always	Below 1 Ω
   N14-5 (FPC) or A38-52 (FPC) - Body ground	Always	10 kΩ or higher

   for RHD

   Tester Connection	Condition	Specified Condition
   N14-5 (FPC) - A52-52 (FPC)	Always	Below 1 Ω
   N14-5 (FPC) or A52-52 (FPC) - Body ground	Always	10 kΩ or higher

1. Replace the fuel pump (Click here).
   

1. Replace the fuel pump ECU (Click here).
   

1. Check the fuel pump operation.
   

   OK:

   Malfunction has been repaired successfully.