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

INSPECT EFI NO.2 RELAY

CHECK EFI NO.2 RELAY (POWER SOURCE VOLTAGE)

CHECK HARNESS AND CONNECTOR (EFI NO.2 RELAY - FUEL PUMP ECU)

CHECK HARNESS AND CONNECTOR (EFI NO.2 RELAY - NO. 1 INTEGRATION RELAY, BATTERY AND BODY GROUND)

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

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 engine switch on (IG).
   

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.
   

1. Disconnect the fuel pump ECU connector.
   

2. Turn the engine switch on (IG).
   

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	Engine switch on (IG)	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 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

   
   

   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

1. Replace the fuel pump ECU (w/ Active Height Control) (Click here)
   

2. Replace the fuel pump ECU (w/o Active Height Control) (Click here)
   

1. Check the fuel pump operation.
   

   OK:

   Malfunction has been repaired successfully.
   

1. Inspect the EFI NO.2 relay (Click here).
   

1. Remove the EFI NO.2 relay from the engine room relay block.
   

2. Turn the engine switch on (IG).
   

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

   Standard Voltage:

   Tester Connection	Condition	Specified Condition
   EFI NO.2 relay (1) - Body ground	Engine switch on (IG)	11 to 14 V
   EFI NO.2 relay (5) - Body ground	Always	11 to 14 V

   Text in Illustration

   *1	Engine Room Relay Block:
   *2	EFI NO. 2 RELAY

1. Remove the EFI NO.2 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
   EFI NO.2 relay (3) - N14-6 (+B)	Always	Below 1 Ω
   EFI NO.2 relay (3) or N14-6 (+B) - Body ground	Always	10 kΩ or higher

1. Disconnect the cable from the negative (-) battery terminal.
   

2. Disconnect the cable from the positive (+) battery terminal.
   

3. Remove the EFI NO.2 relay from the engine room relay block.
   

4. Remove the No. 1 integration relay from the engine room relay block.
   

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

   Standard Resistance:

   
   

   Tester Connection	Condition	Specified Condition
   EFI NO.2 relay (1) - 1B-4	Always	Below 1 Ω
   EFI NO.2 relay (5) - Battery positive (+) terminal	Always	Below 1 Ω
   EFI NO.2 relay (2) - Body ground	Always	Below 1 Ω
   EFI NO.2 relay (1) or 1B-4 - Body ground	Always	10 kΩ or higher
   EFI NO.2 relay (5) or Battery positive (+) terminal - Body ground	Always	10 kΩ or higher

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:

   Confirm that no fuel remains inside or on the outside of the fuel pump.

5. Connect the GTS to the DLC3.
   

6. Turn the engine switch on (IG).
   

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	Tester 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	Tester 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 of the connectors connected.
       
    2. Before performing this inspection, check that the battery voltage is between 11 and 14 V (not depleted).
       

    Text in Illustration

    *a	Component with harness connected (Fuel Pump)

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 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

   
   

   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

1. Replace the fuel pump (Click here).
   

1. Replace the fuel pump ECU (w/ Active Height Control) (Click here)
   

2. Replace the fuel pump ECU (w/o Active Height Control) (Click here)
   

1. Check the fuel pump operation.
   

   OK:

   Malfunction has been repaired successfully.