СИСТЕМА SFI Fuel Pump Control Circuit

DESCRIPTION

The fuel pump circuit consists of the ECM, fuel pump and fuel pump control ECU (which operates the fuel pump). Based on the engine output, the ECM determines the fuel pump speed. The speed is then converted to a duty signal and sent to the fuel pump control ECU. Based on the signal sent from the ECM, the fuel pump ECU adjust the fuel pump operation speed.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

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

   
   

   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 / Active Test / Control the Fuel Pump/Speed.

      
      Powertrain > Engine > Active Test

      Tester Display
      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
      Proceed to OK NG

   
   

   NG

   INSPECT FUEL PUMP CONTROL ECU (POWER SOURCE VOLTAGE) Click here

   OK

2. PERFORM ACTIVE TEST USING GTS (CONTROL THE FUEL PUMP)

   
   

   1. Remove the fuel pump (low pressure side) from the fuel tank assembly.

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

   3. Connect the fuel pump connector.

      CAUTION:

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

   4. Connect the GTS to the DLC3.

   5. Turn the engine switch on (IG).

   6. Turn the GTS on.

   7. Enter the following menus: Powertrain / Engine / Active Test / Control the Fuel Pump Duty.

      
      Powertrain > Engine > Active Test

      Tester Display
      Control the Fuel Pump Duty

   8. 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

   9. Enter the following menus: Powertrain / Engine / Active Test / Control the Fuel Pump/Speed.

      
      Powertrain > Engine > Active Test

      Tester Display
      Control the Fuel Pump / Speed

   10. 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

       Tech Tips

       
       

       • Be sure to measure the voltage with all the connectors connected.

       • Before performing this inspection, check that the battery voltage is between 11 and 14 V (not depleted).

       Result
       Proceed to OK NG

   
   

   NG

   GO TO STEP 10 Click here

   OK

3. CHECK HARNESS AND CONNECTOR (FUEL PUMP CONTROL ECU - ECM)

   
   

   1. Disconnect the fuel pump control ECU connector.

   2. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Q61-2 (FPC) - A76-5 (FPC) Always Below 1 Ω Q61-2 (FPC) or A76-5 (FPC) - Body ground Always 10 kΩ or higher

      Result
      Proceed to OK NG

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

4. REPLACE FUEL PUMP (FOR LOW PRESSURE SIDE)

   
   

   1. Replace the fuel pump (for low pressure side).

      Click here

      Result
      Proceed to NEXT

   
   

   NEXT

   GO TO STEP 11 Click here

5. INSPECT FUEL PUMP CONTROL ECU (POWER SOURCE VOLTAGE)

   
   
   1. 

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

      Disconnect the fuel pump control 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 Condition Specified Condition Q61-1 (+B) - Body Ground Engine switch on (IG) 11 to 14 V

      Result
      Proceed to OK NG

   
   

   NG

   INSPECT RELAY (EFI MAIN NO. 2) Click here

   OK

6. CHECK HARNESS AND CONNECTOR (FUEL PUMP (FOR LOW PRESURE SIDE) - FUEL PUMP CONTROL ECU)

   
   

   1. Disconnect the fuel pump (for low pressure side) connector.

   2. Disconnect the fuel pump control ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Q29-4 (B) - Q61-6 (FP) Always Below 1 Ω Q29-5 (E) - Q61-5 (FP-) Always Below 1 Ω Q29-4 (B) or Q61-6 (FP) - Body ground Always 10 kΩ or higher Q29-5 (E) or Q61-5 (FP-) - Body ground Always 10 kΩ or higher

      Result
      Proceed to OK NG

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

7. INSPECT FUEL PUMP (FOR LOW PRESSURE SIDE)

   
   

   1. Inspect the fuel pump (low pressure side).

      Click here

      Result
      Proceed to OK NG

   
   

   NG

   REPLACE FUEL PUMP (FOR LOW PRESSURE SIDE) Click here

   OK

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

   
   

   1. Disconnect the fuel pump control ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Q61-4 (E) - Body ground Always Below 1 Ω

      Result
      Proceed to OK NG

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

9. CHECK HARNESS AND CONNECTOR (FUEL PUMP CONTROL ECU - ECM)

   
   

   1. Disconnect the fuel pump control ECU connector.

   2. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Q61-2 (FPC) - A76-5 (FPC) Always Below 1 Ω Q61-2 (FPC) or A76-5 (FPC) - Body ground Always 10 kΩ or higher

      Result
      Proceed to OK NG

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

10. REPLACE FUEL PUMP CONTROL ECU

    
    

    1. Replace the fuel pump control ECU.

       Click here

       Result
       Proceed to NEXT

    
    

    NEXT

11. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

    
    

    1. Check the fuel pump operation.

       OK
       Malfunction has been repaired successfully.

       Result
       Proceed to OK NG

    
    

    OK

    END

    NG

    REPLACE ECM Click here

12. INSPECT RELAY (EFI MAIN NO. 2)

    
    

    1. Inspect the EFI MAIN NO. 2 relay.

       Click here

       Result
       Proceed to OK NG

    
    

    NG

    REPLACE RELAY (EFI MAIN NO. 2)

    OK

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

    
    

    1. Remove the EFI MAIN NO. 2 relay from the No. 2 engine room relay block and No. 2 junction block assembly.

    2. Disconnect the fuel pump control ECU connector.

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

       Standard Resistance
       Tester Connection Condition Specified Condition 3 (EFI MAIN NO. 2 relay) - Q61-1 (+B) Always Below 1 Ω 3 (EFI MAIN NO. 2 relay) or Q61-1 (+B) - Body ground Always 10 kΩ or higher

       Result
       Proceed to OK NG

    
    

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

14. CHECK HARNESS AND CONNECTOR (SEMICONDUCTOR PWR INTEGRATION ECU - EFI MAIN NO. 2 RELAY)

    
    

    1. Remove the EFI MAIN NO. 2 relay from the No. 2 engine room relay block and No. 2 junction block assembly.

    2. Disconnect the semiconductor pwr integration ECU connector.

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

       Standard Resistance
       Tester Connection Condition Specified Condition 2G-1 - 2 (EFI MAIN NO. 2 relay) Always Below 1 Ω 2G-1 or 2 (EFI MAIN NO. 2 relay) - Body ground Always 10 kΩ or higher

       Result
       Proceed to OK NG

    
    

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

15. CHECK HARNESS AND CONNECTOR (EFI MAIN NO. 2 RELAY - BODY GROUND)

    
    

    1. Remove the EFI MAIN NO. 2 relay from the No. 2 engine room relay block and No. 2 junction block assembly.

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

       Standard Resistance
       Tester Connection Condition Specified Condition 1 (EFI MAIN NO. 2 relay) - Body ground Always Below 1 Ω

       Result
       Proceed to OK NG

    
    

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - EFI MAIN NO. 2 RELAY)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR