SFI SYSTEM(w/ Canister Pump Module) Fuel Pump Control Circuit

DESCRIPTION

• w/ Fuel Pump Control ECU Assembly:

  The fuel pump circuit consists of the ECM, fuel pump and fuel pump control ECU assembly (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 assembly. Based on the signal sent from the ECM, the fuel pump ECU adjust the fuel pump operation speed.

• w/o Fuel Pump Control ECU Assembly:

  When the engine is cranked, the ST (starter) relay drive signal output from the engine switch assembly*1 or certification ECU (smart key ECU assembly)*2 is input into the STA terminal of the ECM, and the NE signal generated by the crankshaft position sensor is also input into the NE+ terminal. The ECM interprets that the engine is cranked, and turns transistor Tr1 in the ECM internal circuit on. Current flows to the C/OPN (Circuit Opening) relay by turning Tr1 on. Then, the fuel pump operates.

  While the NE signal is input into the ECM with the engine running, the ECM turns Tr1 on continuously.

  *1: w/o Entry and Start System

  *2: w/ Entry and Start System

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 and ECT / Active Test / Control the Fuel Pump / Speed.

      
      

      • w/ Fuel Pump Control ECU Assembly

      
      Powertrain > Engine and ECT > Active Test

      Tester Display
      Control the Fuel Pump / Speed

      
      

      • w/o Fuel Pump Control ECU Assembly

      
      Powertrain > Engine and ECT > Active Test

      Tester Display
      Control the Fuel Pump / Speed

   5. Check whether the fuel pump operating sound occurs when performing the Active Test on the GTS.

      OK
      Operating sounds can be heard from the fuel pump.

      Result
      Result Proceed to OK (w/ fuel pump control ECU assembly) A OK (w/o fuel pump control ECU assembly) B NG (w/ fuel pump control ECU assembly) C NG (w/o fuel pump control ECU assembly) D

   
   

   B

   READ VALUE USING GTS (STARTER SIGNAL) Click here

   C

   CHECK TERMINAL VOLTAGE (POWER SOURCE OF FUEL PUMP CONTROL ECU ASSEMBLY) Click here

   D

   CHECK TERMINAL VOLTAGE (POWER SOURCE OF C/OPN RELAY) Click here

   A

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

   
   

   1. Remove the fuel suction with pump and gauge tube assembly.

   2. Clean the fuel suction with pump and gauge tube assembly to completely remove any remaining fuel.

   3. Remove the fuel pump.

   4. Connect the fuel pump and fuel suction with pump and gauge tube assembly connector.

      Note

      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.

      
      Powertrain > Engine and ECT > Active Test

      Tester Display
      Control the Fuel Pump Duty

   9. 

      *a	Component with harness connected (Fuel Pump)

      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 Fuel pump control duty: 25% 3.4 to 4.1 V Fuel pump control duty: 80% 10.0 to 12.5 V

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

       
       Powertrain > Engine and ECT > Active Test

       Tester Display
       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 (Fuel pump control duty: 90%) 10.2 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 9 Click here

   OK

3. INSPECT FUEL PUMP

   
   

   1. Inspect fuel pump.

      Click here

      Tech Tips

      Perform "Inspection After Repair" after replacing the fuel pump.

      Click here

      Result
      Proceed to OK NG

   
   

   OK

   END

   NG

4. REPLACE FUEL PUMP

   
   

   1. Replace the fuel pump.

      Click here

      Tech Tips

      Perform "Inspection After Repair" after replacing the fuel pump.

      Click here

      Result
      Proceed to NEXT

   
   

   NEXT

5. 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

   PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

6. READ VALUE USING GTS (STARTER SIGNAL)

   
   

   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 / Data List / All Data / Starter Signal.

      
      Powertrain > Engine and ECT > Data List

      Tester Display
      Starter Signal

   5. Check the result when the engine switch on (IG) and the engine starts.

      OK
      Condition Starter Signal Engine switch on (IG) OFF Engine Started ON

      Result
      Proceed to OK NG

   
   

   NG

   CHECK STARTER SIGNAL CIRCUIT Click here

   OK

7. READ VALUE USING GTS (ENGINE 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 and ECT / Data List / All Data / Engine Speed.

      
      Powertrain > Engine and ECT > Data List

      Tester Display
      Engine Speed

   5. Read the values displayed on the GTS while cranking.

      OK
      Values are displayed continuously.

      Result
      Proceed to OK NG

   
   

   OK

   PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

   NG

   CHECK CRANKSHAFT POSITION SENSOR CIRCUIT Click here

8. CHECK TERMINAL VOLTAGE (POWER SOURCE OF FUEL PUMP CONTROL ECU ASSEMBLY)

   
   
   1. 

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

      Disconnect the fuel pump control ECU Assembly 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 N19-1 (+B) - N19-4 (E) Always 11 to 14 V

      Result
      Proceed to OK NG

   
   

   NG

   CHECK HARNESS AND CONNECTOR (FUEL PUMP CONTROL ECU ASSEMBLY - BODY GROUND) Click here

   OK

9. INSPECT FUEL PUMP

   
   

   1. Inspect fuel pump.

      Click here

      Tech Tips

      Perform "Inspection After Repair" after replacing the fuel pump.

      Click here

      Result
      Proceed to OK NG

   
   

   NG

   REPLACE FUEL PUMP Click here

   OK

10. CHECK HARNESS AND CONNECTOR (FUEL PUMP - FUEL PUMP CONTROL ECU ASSEMBLY)

    
    

    1. Disconnect the fuel pump control ECU assembly connector.

    2. Disconnect the fuel pump connector.

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

       Standard Resistance
       Tester Connection Condition Specified Condition V1-4 (B) - N19-6 (FP) Always Below 1 Ω V1-5 (E) - N19-5 (FP-) Always Below 1 Ω V1-4 (B) or N19-6 (FP) - Body ground Always 10 kΩ or higher V1-5 (E) or N19-5 (FP-) - Body ground Always 10 kΩ or higher

       Result
       Proceed to OK NG

    
    

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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

    
    

    1. Disconnect the fuel pump control ECU assembly 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 N19-2 (FPC) - A62-21 (FPC) Always Below 1 Ω N19-2 (FPC) or A62-21 (FPC) - Body ground Always 10 kΩ or higher

       Result
       Proceed to OK NG

    
    

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

12. INSPECT ECM (FPC TERMINAL)

    
    

    1. Disconnect the fuel pump control ECU assembly connector.

    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.

       
       Powertrain > Engine and ECT > Active Test

       Tester Display
       Control the Fuel Pump / Speed

    5. Operate the fuel pump control ECU assembly using the Active Test function and measure the resistance according to the value(s) in the table below.

       Standard Resistance
       Tester Connection GTS Operation Specified Condition N19-2 (FPC) - Body ground Before Active Test → During Active Test Before Active Test: Resistance is stable → During Active Test: Resistance fluctuates*

       Tech Tips

       *: Using the Active Test, duty control of the transistors in the ECM will be performed. Due to the duty control, resistance of the FPC terminal will be unstable during the Active Test. If the resistance is stable before the Active Test and fluctuates while performing the Active Test, it can be determined that the transistor is operating. If the transistor does not operate during the Active Test, the ECM may be malfunctioning.

       Result
       Proceed to OK NG

    
    

    OK

    REPLACE FUEL PUMP CONTROL ECU ASSEMBLY Click here

    NG

    REPLACE ECM Click here

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

    
    

    1. Disconnect the fuel pump control ECU assembly connector.

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

       Standard Resistance
       Tester Connection Condition Specified Condition N19-4 (E) - Body ground Always Below 1 Ω

       Result
       Proceed to OK NG

    
    

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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

    
    

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

    2. Disconnect the fuel pump control ECU assembly 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) - N19-1 (+B) Always Below 1 Ω 3 (EFI-MAIN NO. 2 relay) or N19-1 (+B) - Body ground Always 10 kΩ or higher

       Result
       Proceed to OK NG

    
    

    OK

    GO TO ECM POWER SOURCE CIRCUIT Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

15. CHECK TERMINAL VOLTAGE (POWER SOURCE OF C/OPN RELAY)

    
    
    1. 

       *1	Engine Room Relay Block and Junction Block Assembly
       *2	C/OPN Relay

       Remove the C/OPN relay from the engine room relay block and junction block assembly.

    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 1 (C/OPN relay) - Body ground Engine switch on (IG) 11 to 14 V

       Result
       Proceed to OK NG

    
    

    NG

    CHECK HARNESS AND CONNECTOR (C/OPN RELAY - IG2 RELAY) Click here

    OK

16. INSPECT C/OPN RELAY

    
    

    1. Inspect the C/OPN relay.

       Click here

       Result
       Proceed to OK NG

    
    

    NG

    REPLACE C/OPN RELAY

    OK

17. CHECK HARNESS AND CONNECTOR (C/OPN RELAY - ECM)

    
    

    1. Remove the C/OPN relay from the engine room relay block and junction block assembly.

    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 2 (C/OPN relay) - A62-21 (FC) Always Below 1 Ω 2 (C/OPN relay) or A62-21 (FC) - Body ground Always 10 kΩ or higher

       Result
       Proceed to OK NG

    
    

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

18. CHECK HARNESS AND CONNECTOR (C/OPN RELAY - FUEL PUMP)

    
    

    1. Remove the C/OPN relay from the engine room relay block and junction block assembly.

    2. Disconnect the fuel pump connector.

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

       Standard Resistance
       Tester Connection Condition Specified Condition 3 (C/OPN relay) - V1-4 (B) Always Below 1 Ω 3 (C/OPN relay) or V1-4 (B) - Body ground Always 10 kΩ or higher

       Result
       Proceed to OK NG

    
    

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

19. CHECK HARNESS AND CONNECTOR (FUEL PUMP - BODY GROUND)

    
    

    1. Disconnect the fuel pump connector.

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

       Standard Resistance
       Tester Connection Condition Specified Condition V1-5 (E) - Body ground Always Below 1 Ω

       Result
       Proceed to OK NG

    
    

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

20. INSPECT FUEL PUMP

    
    

    1. Inspect fuel pump.

       Click here

       Tech Tips

       Perform "Inspection After Repair" after replacing the fuel pump.

       Click here

       Result
       Proceed to OK NG

    
    

    NG

    REPLACE FUEL PUMP Click here

    OK

21. CHECK HARNESS AND CONNECTOR (C/OPN RELAY - EFI-MAIN NO. 2 RELAY)

    
    

    1. Remove the C/OPN relay and EFI-MAIN NO. 2 relay from the engine room relay block and junction block assembly.

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

       Standard Resistance
       Tester Connection Condition Specified Condition 5 (C/OPN relay) - 3 (EFI-MAIN NO. 2 relay) Always Below 1 Ω 5 (C/OPN relay) or 3 (EFI-MAIN NO. 2 relay) - Body ground Always 10 kΩ or higher

       Result
       Proceed to OK NG

    
    

    OK

    GO TO ECM POWER SOURCE CIRCUIT Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

22. CHECK HARNESS AND CONNECTOR (C/OPN RELAY - IG2 RELAY)

    
    

    1. Remove the C/OPN relay and IG2 relay from the engine room relay block and junction block assembly.

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

       Standard Resistance
       Tester Connection Condition Specified Condition 1 (C/OPN relay) - 5 (IG2 relay) Always Below 1 Ω 1 (C/OPN relay) or 5 (IG2 relay) - Body ground Always 10 kΩ or higher

       Result
       Proceed to OK NG

    
    

    OK

    GO TO ECM POWER SOURCE CIRCUIT Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR