ECD SYSTEM (w/o DPF), Diagnostic DTC:P0627

DTC Code DTC Name
P0627 Fuel Pump Control Circuit / Open

DESCRIPTION

Refer to the System Description Click here.

P0627
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Idling for 1 second Even though the CPU (command area inside ECU) is outputting the suction control valve operation duty, the output monitor signal is absent for 0.5 seconds (1 trip detection logic).

  • Open or short in suction control valve circuit

  • Suction control valve

  • ECM
Related Data List
DTC No. Data List
P0627 Fuel Press

Tech Tips


  • For more information on the fuel supply pump (suction control valve) and the common rail system, refer to the System Description Click here.

  • When DTC P0627 is stored, check the internal fuel pressure of the common rail by entering the following menus on the intelligent tester: Powertrain / Engine / Data List / Fuel Press.

    Under a stable operating condition such as idling, Fuel Press is within +/-5 MPa of Target Common Rail Pressure.

WIRING DIAGRAM

A015BTAE09

INSPECTION PROCEDURE

Note


  • After replacing the ECM, the new ECM needs registration Click here and initialization Click here.

  • After replacing the fuel supply pump, the ECM needs initialization Click here.

Tech Tips

Read freeze frame data using the intelligent tester. 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.

PROCEDURE


  1. INSPECT FUEL SUPPLY PUMP (SUCTION CONTROL VALVE)


    1. A015766E02

      Disconnect the suction control valve connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 - 2 20°C (68°F) 1.9 to 2.3 Ω

    NG

    REPLACE FUEL SUPPLY PUMP Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (SUCTION CONTROL VALVE - ECM)


    1. A015A9JE04

      Disconnect the suction control valve connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance (Check for open)
      for LHD
      Tester Connection Condition Specified Condition
      z64-2 (PCV) - C45-105 (PCV-) Always Below 1 Ω
      z64-1 (+B) - C45-106 (PCV+) Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      z64-2 (PCV) - C46-105 (PCV-) Always Below 1 Ω
      z64-1 (+B) - C46-106 (PCV+) Always Below 1 Ω
      Standard Resistance (Check for short)
      for LHD
      Tester Connection Condition Specified Condition
      z64-2 (PCV) or C45-105 (PCV-) - Body ground Always 10 kΩ or higher
      z64-1 (+B) or C45-106 (PCV+) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      z64-2 (PCV) or C46-105 (PCV-) - Body ground Always 10 kΩ or higher
      z64-1 (+B) or C46-106 (PCV+) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  3. CHECK WHETHER DTC OUTPUT RECURS


    1. Connect the intelligent tester to the DLC3

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

    3. Clear the DTCs Click here.

    4. Start the engine and idle it for 1 second.

    5. Enter the following menus: Powertrain / Engine / DTC.

    6. Read the DTCs.

      Result
      Result Proceed to
      P0627 is output A
      No DTC is output B

    A

    REPLACE ECM Click here

    B

    END

  4. REPLACE FUEL SUPPLY PUMP


    1. Replace the fuel supply pump Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  5. REPAIR OR REPLACE HARNESS OR CONNECTOR


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  6. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  7. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the intelligent tester to the DLC3.

    2. Clear the DTCs Click here.

    3. Turn the ignition switch off.

    4. Start the engine and idle it for 1 second.

    5. Confirm that the DTC is not output again.

      Tech Tips

      Perform the following procedure using the tester to determine whether or not the DTC judgment has been carried out.


      1. Enter the following menus: Powertrain / Engine / Utility / All Readiness.

      2. Input DTC P0627.

      3. Check that STATUS is NORMAL. If STATUS is INCOMPLETE or UNKNOWN, increase idling time.


    NEXT

    END