SFI SYSTEM (w/ Dual VVT-i) Fuel Pump Control Circuit

DESCRIPTION

When the engine is cranked, the starter (ST) relay drive signal output from the ignition switch is input into the STA terminal of the ECM, and the NE signal generated by the crankshaft position sensor is input into the NE+ terminal. The ECM determines that the engine is cranked, and turns transistor in the ECM internal circuit on. Current flows to the circuit opening (C/OPN) relay by turning transistor on.

Then, the fuel pump operates.

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

WIRING DIAGRAM

A003IAXE02

INSPECTION PROCEDURE

Note

Inspect the fuses of 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 and turn the GTS on.

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

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

      OK
      Fuel pump operating sound occurs.

    NG

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

    OK

  2. READ VALUE USING GTS (STARTER SIGNAL)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

    3. Enter the following menus: Powertrain / Engine and ECT / Data List / Starter Signal.

    4. Check the result when the ignition switch is turned to ON and START.

      OK
      Ignition Switch Position Starter Signal
      ON OFF
      START ON

    NG

    REPAIR OR REPLACE STARTING SYSTEM

    OK

  3. READ VALUE USING GTS (ENGINE SPEED)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

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

    4. Read the values displayed on the GTS while cranking the engine.

      OK
      Values are displayed continuously.

    NG

    REPAIR OR REPLACE CRANKSHAFT POSITION SENSOR CIRCUIT

    OK

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

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


    1. Disconnect the ECM connector.

    2. Disconnect the No. 1 integration relay connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B94-41 (FC) - 10A-3 Always Below 1 Ω
      B94-41 (FC) or 10A-3 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. INSPECT NO. 1 INTEGRATION RELAY (C/OPN RELAY INPUT VOLTAGE)


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

    2. A003FELE01
      Text in Illustration
      *a

      Component with harness connected

      (No. 1 Integration Relay)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      10A-2 - Body ground Ignition switch off Below 1 V
      10A-4 - Body ground
      10A-2 - Body ground Ignition switch ON 11 to 14 V
      10A-4 - Body ground Engine cranking

    NG

    INSPECT NO. 1 INTEGRATION RELAY (C/OPN) Click here

    OK

  6. CHECK HARNESS AND CONNECTOR (FUEL PUMP - NO. 1 INTEGRATION RELAY, BODY GROUND)


    1. Remove the No. 1 integration relay from the No. 1 engine room 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
      h2-4 - 10A-4 Always Below 1 Ω
      h2-5 - Body ground Always Below 1 Ω
      h2-4 or 10A-4 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. INSPECT FUEL PUMP


    1. Inspect the fuel pump Click here.

      Tech Tips

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


    NG

    REPLACE FUEL PUMP Click here

    OK

    REPLACE ECM Click here

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


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


    NG

    REPLACE NO. 1 INTEGRATION RELAY

    OK

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


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

    2. Remove the No. 2 integration relay from the instrument panel relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      12B-7 - 10A-2 Always Below 1 Ω
      10A-1 - 10A-8 Always Below 1 Ω
      12B-7 or 10A-2 - Body ground Always 10 kΩ or higher
      10A-1 or 10A-8 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    CHECK ECM POWER SOURCE CIRCUIT Click here