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

DESCRIPTION

When the engine is being cranked, the start request signal output from the hybrid vehicle control ECU is input to the ECM, and the NE signal generated by the crankshaft position sensor is also input to the ECM. Thus, the ECM interprets that the engine is being cranked, and turns an internal transistor on, causing current to flow to the C/OPN relay. The fuel pump then operates the NE signal is input into the ECM with the engine running, the ECM keeps the transistor on.

WIRING DIAGRAM

B004OY5E01

CAUTION / NOTICE / HINT

Note

Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS (ACTIVATE THE CIRCUIT RELAY)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Active Test / Activate the Circuit Relay.


      Powertrain > Engine > Active Test
      Tester Display
      Activate the Circuit Relay

    5. According to the display on the GTS, perform the Active Test and check that fuel pump operating sounds can be heard.

      OK
      Operating sounds can be heard from the fuel pump.
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT RELAY (C/OPN RELAY) Click here

    OK

  2. READ VALUE USING GTS (ENGINE SPEED)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Put the engine in Inspection Mode (Maintenance Mode).

      Click here


      Powertrain > Hybrid Control > Utility
      Tester Display
      Inspection Mode

    5. Enter the following menus: Powertrain / Engine / Data List / Engine Speed.


      Powertrain > Engine > Data List
      Tester Display
      Engine Speed

    6. Read the values displayed on the GTS while the engine is 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

  3. INSPECT RELAY (C/OPN RELAY)


    1. Inspect the C/OPN relay.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE RELAY (C/OPN RELAY)

    OK

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


    1. Remove the C/OPN relay from the No. 2 relay block.

    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) - A40-41 (FC) Always Below 1 Ω
      2 (C/OPN relay) or A40-41 (FC) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the No. 1 integration relay connector.

    2. Remove the C/OPN relay from the No. 2 relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1A-9 - 1 (C/OPN relay) Always Below 1 Ω
      1B-4 - 5 (C/OPN relay) Always Below 1 Ω
      1A-9 or 1 (C/OPN relay) - Body ground and other terminals Always 10 kΩ or higher
      1B-4 or 5 (C/OPN relay) - Body ground and other terminals Always 10 kΩ or higher

      Tech Tips

      If a short is detected in any of the above circuits, there may be a malfunction in the circuit of a connected ECU.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Remove the C/OPN relay from the No. 2 relay block.

    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) - M10-4 (B) Always Below 1 Ω
      3 (C/OPN relay) or M10-4 (B) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. 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
      M10-5 (E) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. INSPECT FUEL PUMP


    1. Inspect the fuel pump.

      Click here

      Tech Tips

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

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM Click here

    NG

    REPLACE FUEL PUMP Click here