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

DESCRIPTION

When the engine is cranked, the starter (ST) relay drive signal output from the certification ECU (smart key ECU assembly) 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 in the ECM internal circuit on. Current flows to the C/OPN relay by turning transistor on. Then, the fuel pump operates.

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

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.

      
      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 fuel pump.

      Result
      Proceed to OK NG

   
   

   NG

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

   OK

2. 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 / Primary / Starter Signal.

      
      Powertrain > Engine > Data List

      Tester Display
      Starter Signal

   5. Check the result when the engine switch is 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

3. 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 / Primary / Engine Speed.

      
      Powertrain > Engine > 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

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

   
   

   1. Remove the C/OPN relay from the No. 1 engine room relay block and junction block assembly.

   2. Turn the engine switch on (IG).

   3. 

      *1	No. 1 Engine Room Relay Block and Junction Block Assembly
      *2	C/OPN Relay

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

      Standard Voltage
      Tester Connection Condition Specified Condition 1 (C/OPN relay holder) - Body ground Engine switch on (IG). 11 to 14 V

      Result
      Proceed to OK NG

   
   

   NG

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

   OK

5. INSPECT C/OPN RELAY

   
   

   1. Inspect the C/OPN relay.

      Click here

      Result
      Proceed to OK NG

   
   

   NG

   REPLACE C/OPN RELAY

   OK

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

   
   

   1. Remove the C/OPN relay from the No. 1 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 holder) - A35-41 (FC) Always Below 1 Ω 2 (C/OPN relay folder) or A35-41 (FC) - Body ground and other terminals Always 10 kΩ or higher

      Result
      Proceed to OK NG

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

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

   
   

   1. Remove the C/OPN relay from the No. 1 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 holder) - b1-4 (B) Always Below 1 Ω 3 (C/OPN relay holder) or b1-4 (B) - Body ground and other terminals Always 10 kΩ or higher

      Result
      Proceed to OK NG

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

8. 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 b1-5 (E) - Body ground Always Below 1 Ω

      Result
      Proceed to OK NG

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   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 TERMINAL VOLTAGE (POWER SOURCE OF C/OPN RELAY)

    
    

    1. Remove the C/OPN relay from the No. 1 engine room relay block and junction block assembly.

    2. Turn the engine switch on (IG).

    3. 

       *1	No. 1 Engine Room Relay Block and Junction Block Assembly
       *2	C/OPN Relay

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

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

       Result
       Proceed to OK NG

    
    

    OK

    REPLACE ECM Click here

    NG

11. CHECK HARNESS AND CONNECTOR (C/OPN RELAY - EFI-MAIN NO. 1 RELAY)

    
    

    1. Remove the C/OPN relay and EFI-MAIN NO. 1 relay from the No. 1 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 holder) - 3 (EFI-MAIN NO. 1 relay holder) Always Below 1 Ω 5 (C/OPN relay holder) or 3 (EFI-MAIN NO. 1 relay holder) - Body ground and other terminals 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

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

    
    

    1. Remove the C/OPN relay and IG2-MAIN relay from the No. 1 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 holder) - 5 (IG2-MAIN relay holder) Always Below 1 Ω 1 (C/OPN relay holder) or 5 (IG2-MAIN relay holder) - Body ground and other terminals 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