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ECD SYSTEM Fuel Pump Control Circuit

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DTC Code DTC Name
  Fuel Pump Control Circuit
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DESCRIPTION

When the engine is cranked, the ST (Starter) relay drive signal is input to the STA terminal of the ECM, and 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, current flows to the FUEL PUMP (Circuit Opening) relay the fuel pump (fuel suction with pump and gauge tube assembly) operates.

While the NE signal is input to the ECM with the engine running, the fuel pump operates continuously.

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WIRING DIAGRAM

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INSPECTION PROCEDURE

Note:

  • When replacing the ECM, the ECM needs Registration and Initialization (Click here).

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

Tip:

  • When the ECM must be replaced, before replacing the ECM, perform the "Learning Values Save" function using the GTS. Then after installing the new ECM, perform all of the initialization/registrations for the "Learning Values Write" function by following the instructions shown on the GTS display.

  • Read freeze frame data using the GTS. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction occurred.

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PROCEDURE


  1. Click here

    PERFORM ACTIVE TEST USING GTS (ACTUATOR TEST OF FPC(EU5) )


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine and ECT / Active Test / Actuator Test of FPC(EU5).

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

      Table 1. Result
      Result Proceed to
      Fuel pump operating sound does not occur A
      Fuel pump operating sound occurs B

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    INSPECT NO. 1 INTEGRATION RELAY (FUEL PUMP)


    1. Inspect the No. 1 integration relay (Click here).


  3. Click here

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


    1. Remove the No. 1 integration relay from engine room No. 1 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
      1B-2 - A76-60 (FC) Always Below 1 Ω
      1B-2 or A76-60 (FC) - Body ground Always 10 kΩ or higher

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    CHECK HARNESS AND CONNECTOR (FUEL PUMP RELAY - IG2 RELAY)


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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1B-3 - 1A-4 Always Below 1 Ω
      1B-3 or 1A-4 - Body ground Always 10 kΩ or higher

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    CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - FUEL SUCTION WITH PUMP AND GAUGE TUBE ASSEMBLY - BODY GROUND)


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

    2. Disconnect the fuel pump (fuel suction with pump and gauge tube assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1B-4 - N18-4 (B) Always Below 1 Ω
      N18-5 (E) - Body ground Always Below 1 Ω
      1B-4 or N18-4 (B) - Body ground Always 10 kΩ or higher

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    INSPECT FUEL PUMP (FUEL SUCTION WITH PUMP AND GAGE TUBE ASSEMBLY)


    1. Inspect the fuel pump (fuel suction with pump and gauge tube assembly) (Click here).


  7. Click here

    REPLACE NO. 1 INTEGRATION RELAY

  8. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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    REPAIR OR REPLACE HARNESS OR CONNECTOR

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    REPAIR OR REPLACE HARNESS OR CONNECTOR

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    REPLACE FUEL SUCTION WITH PUMP AND GAGE TUBE ASSEMBLYClick here

  12. Click here

    REPLACE ECMClick here

  13. Click here

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLEClick here