SFI SYSTEM Fuel Pump Control Circuit

DESCRIPTION

When the engine is cranked, the start request signal output from the hybrid vehicle control ECU*1, or ignition or starter switch assembly*2 is input to the ECM, and the NE signal generated by the crankshaft position sensor is also input to the NE+ terminal. Thus, the ECM interprets that the engine has been 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 with filter assembly operates.

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


WIRING DIAGRAM

A004EQGE04

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


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


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON (IG).

    3. Turn the GTS on.

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

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

      Result
      Result Proceed to
      Fuel pump with filter assembly operating sound does not occur A
      Fuel pump with filter assembly operating sound occurs B

    B

    READ VALUE USING GTS (STARTER COUNT) Click here

    A

  2. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - ECM)


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

    2. Disconnect the A28 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2D-7 - A28-21 (FC) Always Below 1 Ω
      2D-7 or A28-21 (FC) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - FUEL PUMP WITH FILTER ASSEMBLY)


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

    2. Disconnect the K16 fuel pump with filter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2D-8 - K16-4 (B) Always Below 1 Ω
      2D-8 or K16-4 (B) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (FUEL PUMP WITH FILTER ASSEMBLY - BODY GROUND)


    1. Disconnect the K16 fuel pump with filter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K16-5 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. INSPECT FUEL PUMP WITH FILTER ASSEMBLY


    1. Inspect the fuel pump with filter assembly Click here.

      Tech Tips

      Perform "Inspection After Repair" after replacing the fuel pump with filter assembly Click here.


    NG

    REPLACE FUEL PUMP WITH FILTER ASSEMBLY Click here

    OK

  6. INSPECT NO. 1 INTEGRATION RELAY (C/OPN RELAY)


    1. Inspect the No. 1 integration relay (C/OPN relay) Click here.


    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 1 INTEGRATION RELAY (C/OPN RELAY) POWER SOURCE CIRCUIT)

    NG

    REPLACE NO. 1 INTEGRATION RELAY Click here

  7. READ VALUE USING GTS (STARTER COUNT)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON (IG).

    3. Turn the GTS on.

    4. Put the engine in inspection mode (maintenance mode) Click here.

    5. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Starter Count.

    6. Check the result when the ignition switch to ON (IG) and while cranking.

      OK
      Condition Starter Count
      Ignition switch ON (IG) 0
      Ignition switch ON (READY) (While cranking) 1 or more (Value changes)

    NG

    GO TO HYBRID CONTROL SYSTEM Click here

    OK

  8. READ VALUE USING GTS (ENGINE SPEED)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON (IG).

    3. Turn the GTS on.

    4. Put the engine in inspection mode (maintenance mode) Click here.

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

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

      OK
      Values are displayed continuously.

    OK

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

    NG

    CHECK CRANKSHAFT POSITION SENSOR CIRCUIT Click here