ECD SYSTEM (w/o EGR Cooler Bypass Valve), 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 and ECT / Data List / Fuel Press.

Engine Speed Fuel Pressure
Idling Approximately 30 to 40 MPa
3,000 rpm (No engine load) Approximately 50 to 70 MPa

WIRING DIAGRAM

A01KF6SE06

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

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

PROCEDURE


  1. INSPECT SUPPLY PUMP ASSEMBLY (SUCTION CONTROL VALVE)


    1. A01KGU2E11
      Text in Illustration
      *1 Suction Control Valve

      Disconnect the S11 suction control valve connector.

    2. Measure the resistance of the suction control valve.

      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. A01KHM2E19
      Text in Illustration
      *1 Suction Control Valve Connector
      *2 ECM Connector
      *a Wire Harness Side
      *b Front View

      Disconnect the S11 suction control valve connector.

    2. Disconnect the E6 ECM connector.

    3. Check the resistance.

      Standard resistance (Check for open)
      Tester Connection Specified Condition
      S11-1 - E6-2 (PCV+) Below 1 Ω
      S11-2 - E6-1 (PCV-) Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Specified Condition
      S11-1 or E6-2 (PCV+) - Body ground 10 kΩor higher
      S11-2 or E6-1 (PCV-) - Body ground 10 kΩor higher

    4. Reconnect the suction control valve connector.

    5. Disconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT ECM (PCV VOLTAGE)


    1. A01KG2WE29
      Text in Illustration
      *1 ECM Connector

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

      OK
      Tester Connection Specified Condition
      E6-2 (PCV+) - E6-1 (PCV-) Correct waveform is as 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