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

DTC Code DTC Name
P0627 Fuel Pump Control Circuit / Open

DESCRIPTION

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 selecting the following menu items on an intelligent tester: Powertrain / Engine / Data List / Fuel Press.

Reference
Engine Speed Fuel Pressure
Idling Approximately 30 to 40 MPa
3,000 rpm (No engine load) Approximately 85 to 105 MPa

WIRING DIAGRAM

A01BDYTE03

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 an intelligent tester. Freeze frame data record 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, if the air-fuel ratio was lean or rich, and other data, from the time the malfunction occurred.

PROCEDURE


  1. INSPECT SUPPLY PUMP ASSEMBLY (SUCTION CONTROL VALVE)


    1. A01BD5ZE02

      Disconnect the D47 suction control valve connector.

    2. Measure the suction control valve resistance.

      Standard resistance
      Tester Connection Specified Condition
      1 - 2

      1.9 to 2.3 Ω

      at 20°C (68°F)

    3. Reconnect the suction control valve connector.


    NG

    REPLACE SUCTION CONTROL VALVE

    OK

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


    1. A01BBKLE12

      Disconnect the D47 suction control valve connector.

    2. Disconnect the D1 ECM connector.

    3. Check the resistance.

      Standard resistance (Check for open)
      Tester Connection Specified Condition
      D47-1 - PCV+ (D1-2) Below 1 Ω
      D47-2 - PCV- (D1-1)
      Standard resistance (Check for short)
      Tester Connection Specified Condition
      D47-1 or PCV+ (D1-2) - Body ground 10 kΩ or higher
      D47-2 or PCV- (D1-1) - Body ground

    4. Reconnect the ECM connector.

    5. Reconnect the suction control valve connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT ECM (PCV VOLTAGE)


    1. A01BFM2E20

      Inspect the ECM using the oscilloscope.

    2. During cranking or idling, check the waveform between the specified terminals of the D1 ECM connector.

      Standard
      Tester Connection Specified Condition
      PCV+ (D1-2) - PCV- (D1-1) Correct waveform is as shown

    NG

    REPLACE ECM

    OK

    CHECK FOR INTERMITTENT PROBLEMS