Dtc P0627 Fuel Pump Control Circuit / Open


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT FUEL SUPPLY PUMP ASSEMBLY (SUCTION CONTROL VALVE)

CHECK HARNESS AND CONNECTOR (SUCTION CONTROL VALVE - ECM)

CHECK WHETHER DTC OUTPUT RECURS

REPLACE SUCTION CONTROL VALVE

BLEED AIR FROM FUEL SYSTEM

PERFORM FUEL SUPPLY PUMP INITIALIZATION

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

DTC 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).
  1. Open or short in suction control valve circuit
  2. Suction control valve
  3. ECM

Related Data List
DTC No.
Data List
P0627
Fuel Press
Target Common Rail Pressure
HINT:
  1. For more information on the fuel supply pump assembly (suction control valve) and common rail system, refer to System Description (LandCruiser RM000000XSN04LX.html).
  2. 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 (LandCruiser RM0000018840CNX_06.html).

INSPECTION PROCEDURE

NOTICE:
  1. After replacing the ECM, the new ECM needs registration (LandCruiser RM0000012XK0ARX.html) and initialization (LandCruiser RM000000TIN08CX.html).
  2. After replacing the fuel supply pump assembly, the ECM needs initialization (LandCruiser RM000000TIN08CX.html).
HINT:
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.
1.INSPECT FUEL SUPPLY PUMP ASSEMBLY (SUCTION CONTROL VALVE)

  1. Inspect the suction control valve (LandCruiser RM0000045CF00AX_01_0001.html).



NG
Go to step 4
OK


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

  1. Disconnect the suction control valve connector.

  1. Disconnect the ECM connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    C71-1 - C92-23 (PCV+)
    		Always
    		Below 1 Ω
    C71-2 - C92-12 (PCV-)
    		Always
    		Below 1 Ω
    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    C71-1 or C92-23 (PCV+) - Body ground
    		Always
    		10 kΩ or higher
    C71-2 or C92-12 (PCV-) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the suction control valve connector.

  1. Reconnect the ECM connector.



NG
Go to step 8
OK


3.CHECK WHETHER DTC OUTPUT RECURS

  1. Connect the intelligent tester to the DLC3

  1. Turn the ignition switch to ON and turn the tester on.

  1. Clear the DTCs (LandCruiser RM000000PDK1DJX.html).

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

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

  1. Read the DTCs.

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



B
Go to step 7
A

END

4.REPLACE SUCTION CONTROL VALVE

  1. Replace the suction control valve (LandCruiser RM000004MF600KX.html).


NEXT


5.BLEED AIR FROM FUEL SYSTEM

  1. Bleed the air from the fuel system (LandCruiser RM000002SY803CX_01_0002.html).


NEXT


6.PERFORM FUEL SUPPLY PUMP INITIALIZATION

  1. Perform fuel supply pump initialization (LandCruiser RM000000TIN08CX.html).



NEXT
Go to step 9

7.REPLACE ECM

  1. Replace the ECM (LandCruiser RM0000013Z002CX.html).



NEXT
Go to step 9

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.

  1. Clear the DTCs (LandCruiser RM000000PDK1DJX.html).

  1. Turn the ignition switch off for 30 seconds or more.

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

  1. Confirm that the DTC is not output again.


NEXT

END