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 control ECU adjusts the fuel pump operation speed between 3 settings.

WIRING DIAGRAM

Refer to DTC P0230.

Click here

CAUTION / NOTICE / HINT

PROCEDURE

1. Click here

   PERFORM ACTIVE TEST USING GTS (FUEL PUMP)

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the engine switch on (IG) and turn the GTS on.

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

      
      
      1. Powertrain > Engine and ECT > Active Test

         Tester Display
         Control the Fuel Pump / Speed

      2. 
         
         1. 
            
      3. 
         
         11. 
             

   4. 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

   
   
   • OK

     PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLEClick here

   • NGClick here
2. Click here

   INSPECT CIRCUIT OPENING RELAY (C/OPN)

   
   

   1. Inspect the circuit opening relay (C/OPN).

      Click here

      Result
      Proceed to OK NG

   
   
   • OKClick here
   • NG

     REPLACE CIRCUIT OPENING RELAY (C/OPN)

3. *1 Engine Room Relay Block and Junction Block *2 Circuit Opening Relay (C/OPN)
   Click here

   INSPECT CIRCUIT OPENING RELAY (C/OPN) (POWER SOURCE VOLTAGE)

   
   

   1. Remove the circuit opening relay (C/OPN) from the engine room relay block.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition C/OPN relay terminal 2 - Body ground Engine switch on (IG) 11 to 14 V C/OPN relay terminal 5 - Body ground Engine switch on (IG) 11 to 14 V

      Result
      Proceed to OK NG

   
   
   • OKClick here
   • NGClick here
4. Click here

   CHECK HARNESS AND CONNECTOR (CIRCUIT OPENING RELAY (C/OPN) - ECM AND FUEL PUMP ECU)

   
   

   1. Remove the circuit opening relay (C/OPN) from the engine room relay block and junction block.

   2. Disconnect the S7 fuel pump control ECU connector.

   3. Disconnect the G107 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition C/OPN relay terminal 1 - G107-8(FC) Always Below 1 Ω C/OPN relay terminal 3 - S7-4 (+B) Always Below 1 Ω C/OPN relay terminal 1 or G107-8 (FC) - Body ground Always 10 kΩ or higher C/OPN relay terminal 3 or S7-4 (+B) - Body ground Always 10 kΩ or higher

      Result
      Proceed to OK NG

   
   
   • OKClick here
   • NG

     REPAIR OR REPLACE HARNESS OR CONNECTOR

5. Click here

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

   
   

   1. Disconnect the S4 fuel sender gauge connector.

   2. Disconnect the S8 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 S4-4 (B2) - S8-1 (FP) Always Below 1 Ω S4-5 (E2) - S8-2 (FP-) Always Below 1 Ω S4-4 (B2) or S8-1 (FP) - Body ground Always 10 kΩ or higher S4-5 (E2) or S8-2 (FP-) - Body ground Always 10 kΩ or higher

      Result
      Proceed to OK NG

   
   
   • OKClick here
   • NG

     REPAIR OR REPLACE HARNESS OR CONNECTOR

6. Click here

   INSPECT FUEL PUMP

   
   

   1. Inspect the fuel pump.

      Click here

      Result
      Proceed to OK NG

   
   
   • OKClick here
   • NG

     REPLACE FUEL PUMPClick here

7. Click here

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

   
   

   1. Disconnect the S7 fuel pump control ECU connector.

   2. Disconnect the G106 and G107 ECM connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition S7-1 (FPC) - G106-3 (FPC) Always Below 1 Ω S7-2 (DI) - G107-26 (DI) Always Below 1 Ω S7-3 (E) - Body ground Always Below 1 Ω S7-1 (FPC) or G106-3 (FPC) - Body ground Always 10 kΩ or higher S7-2 (DI) or G107-26 (DI) - Body ground Always 10 kΩ or higher

      Result
      Proceed to OK NG

   
   
   • OKClick here
   • NG

     REPAIR OR REPLACE HARNESS OR CONNECTOR

8. Click here

   REPLACE FUEL PUMP ECU

   
   

   1. Replace the fuel pump control ECU.

      Click here

      Result
      Proceed to NEXT

   
   
   • NEXTClick here
9. Click here

   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 ECMClick here

10. Click here

    CHECK HARNESS AND CONNECTOR (CIRCUIT OPENING RELAY (C/OPN) - NO. 1 INTEGRATION RELAY)

    
    

    1. Remove the circuit opening relay (C/OPN) from the engine room relay block.

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

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

       Standard Resistance
       Tester Connection Condition Specified Condition C/OPN relay terminal 2 - 1A-5 Always Below 1 Ω C/OPN relay terminal 5 - 1B-4 Always Below 1 Ω C/OPN relay terminal 2 or 1A-5 - Body ground Always 10 kΩ or higher C/OPN relay terminal 5 or 1B-4 - Body ground Always 10 kΩ or higher

       Result
       Proceed to OK NG

    
    
    • OK

      GO TO ECM POWER SOURCE CIRCUITClick here

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR