ECD SYSTEM (for DPF), Diagnostic DTC:P0627

DTC Code DTC Name
P0627 Fuel Pump Control Circuit / Open

DESCRIPTION

P0627
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Idling for 1 second Even though the CPU (command area inside the 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

  • Target Common Rail Pressure

Tech Tips


  • For more information on the fuel supply pump assembly (suction control valve) and common rail system, refer to 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 and ECT / Data List / Fuel Press.

    Under a stable operating condition such as idling, Fuel Press is within 5000 kPa of Target Common Rail Pressure.

WIRING DIAGRAM

Refer to DTC P0088 Click here.

INSPECTION PROCEDURE

Note


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

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

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

  • After replacing an injector assembly, the ECM needs registration 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 ASSEMBLY (SUCTION CONTROL VALVE)


    1. A01DXJ0E03
      Text in Illustration
      *1 Fuel Supply Pump Assembly
      *2 Suction Control Valve

      Disconnect the suction control valve connector.

    2. Measure the resistance of the suction control valve.

      OK
      No open or short circuit malfunction.

    NG

    REPLACE FUEL SUPPLY PUMP ASSEMBLY (SUCTION CONTROL VALVE) Click here

    OK

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


    1. 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
      Tester Connection Condition Specified Condition
      S8-1 - E24-23 (PCV+) Always Below 1 Ω
      S8-2 - E24-12 (PCV-) Always Below 1 Ω
      S8-1 or E24-23 (PCV+) - Body ground Always 10 kΩ or higher
      S8-2 or E24-12 (PCV-) - Body ground Always 10 kΩ or higher

    4. Reconnect the suction control valve connector.

    5. Reconnect the ECM connector.


    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 or more.

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

    6. Read the DTCs.

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

    B

    REPLACE ECM Click here

    A

    END

  4. REPLACE FUEL SUPPLY PUMP ASSEMBLY (SUCTION CONTROL VALVE)


    1. Replace the fuel supply pump assembly Click here.


    NEXT

  5. BLEED AIR FROM FUEL SYSTEM


    1. Bleed the air from the fuel system Click here.


    NEXT

  6. PERFORM FUEL SUPPLY PUMP INITIALIZATION


    1. Perform fuel supply pump initialization Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  7. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  8. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.


    NEXT

  9. 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 for 30 seconds or more.

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

    5. Confirm that the DTC is not output again.


    NEXT

    END