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

DTC Code DTC Name
P0627 Fuel Pump Control Circuit / Open

DESCRIPTION

Refer to 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


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

  • 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
3,000 rpm (No engine load) Approximately 50000 to 70000 kPa

WIRING DIAGRAM

A01DW3NE03

INSPECTION PROCEDURE

Note

After replacing the ECM, the new ECM needs registration Click here and 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 SUPPLY PUMP ASSEMBLY (SUCTION CONTROL VALVE)


    1. A01E1R5E02

      Disconnect the S8 suction control valve connector.

    2. Measure the resistance of the suction control valve.

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

    NG

    REPLACE SUPPLY PUMP ASSEMBLY (SUCTION CONTROL VALVE) Click here

    OK

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


    1. A01DWE5E14

      Disconnect the S8 suction control valve connector.

    2. Disconnect the E8 ECM connector.

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

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT ECM (PCV VOLTAGE)


    1. A01DVT5E22

      Inspect using the oscilloscope.

    2. During cranking or idling, check the waveform between the specified terminals of the E8 ECM connector.

      Standard
      Tester Connection Specified Condition
      PCV+ (E8-2) - PCV- (E8-1) Correct waveform is as shown

    NG

    REPLACE ECM Click here

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here