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

DTC Code DTC Name
P0627 Fuel Pump Control Circuit / Open

DESCRIPTION

Tech Tips

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

DTC No. DTC Detection Condition Trouble Area
P0627

Open or short in suction control valve circuit for more than 0.5 seconds

(1 trip detection logic)

  • Open or short in suction control valve circuit

  • Suction control valve

  • ECM

Tech Tips

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

Reference
Engine Speed Fuel Pressure
Idling Approximately 25000 to 35000 kPa
3000 rpm (No engine load) Approximately 28000 to 48000 kPa

WIRING DIAGRAM

A01DZOTE01

INSPECTION PROCEDURE

Tech Tips

Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition when a malfunction is 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.

Note


  • If the ECM is replaced, the new ECM needs initialization Click here.

  • If the supply pump is replaced, the ECM needs initialization Click here.

PROCEDURE


  1. INSPECT SUPPLY PUMP ASSEMBLY (SUCTION CONTROL VALVE)

    A01E1R5E02

    1. Disconnect the S8 suction control valve connector.

    2. Measure the resistance of the suction control valve.

      Standard resistance
      1.9 to 2.3 Ω at 20°C (68°F)

    NG

    REPLACE SUPPLY PUMP ASSEMBLY

    OK

  2. CHECK WIRE HARNESS (SUCTION CONTROL VALVE - ECM)

    A01E2YOE01

    1. Disconnect the S8 valve connector.

    2. Disconnect the E8 ECM connector.

    3. Measure the resistance of the wire harness side connectors.

      Standard resistance
      Tester Connection Specified Condition
      S8-1 (PCV+) - E8-2 (PCV+) Below 1 Ω
      S8-2 (PCV-) - E8-1 (PCV-) Below 1 Ω
      S8-1 (PCV+) - E8-2 (PCV+) - Body ground 10 kΩ or higher
      S8-2 (PCV-) - E8-1 (PCV-) - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

  3. CHECK ECM (PCV SIGNAL)

    A01DVT5E02

    1. While cranking or idling the engine, check the waveform of the ECM connector using an oscilloscope.

      OK
      Tester Connection Specified Condition
      E8-2 (PCV+) - E8-1 (PCV-) Correct waveform is shown
      Tool Setting Condition
      10 V/DIV., 5 msec./DIV. Idling or cranking with warm engine

      Tech Tips

      The waveform varies depending on the suction control valve operation.


    NG

    REPLACE ECM

    OK

    CHECK FOR INTERMITTENT PROBLEMS