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 FUEL SUPPLY PUMP ASSEMBLY (SUCTION CONTROL VALVE)

BLEED AIR FROM FUEL SYSTEM

PERFORM SUPPLY PUMP INITIALIZATION

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

DESCRIPTION

HINT:

1. For more information on the fuel supply pump assembly (suction control valve) and common rail system, refer to System Description (Click here).
   
2. When DTC P0627 is stored, check the internal fuel pressure of the common rail by entering the following menus on the GTS: Engine and ECT / Data List / Common Rail Pressure.
   Under a stable operating condition such as idling, Common Rail Pressure is within 5000 kPa of Target Common Rail Pressure.
   

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

1. After replacing the ECM, the new ECM needs registration (Click here) and initialization (Click here).
   
2. After replacing the fuel supply pump assembly, the ECM needs initialization (Click here).
   
3. After replacing an injector assembly, the ECM needs registration (Click here).
   

HINT:

Read freeze frame data using the GTS. 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. Disconnect the suction control valve connector.
   

   Text in Illustration

   *1	Fuel Supply Pump Assembly
   *2	Suction Control Valve

2. Measure the resistance of the suction control valve.
   

   OK:

   No open or short circuit malfunction.
   

1. Disconnect the suction control valve connector.
   

2. Disconnect the ECM connector.
   

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

   Standard Resistance:

   
   

   for LHD

   Tester Connection	Condition	Specified Condition
   z64-1 (+B) - C45- 104 (PCV+)	Always	Below 1 Ω
   z64-2 (PCV) - C45-105 (PCV-)	Always	Below 1 Ω
   z64-1 (+B) or C45- 104 (PCV+) - Body ground	Always	10 kΩ or higher
   z64-2 (PCV) or C45-105 (PCV-) - Body ground	Always	10 kΩ or higher

   
   

   Standard Resistance:

   
   

   for RHD

   Tester Connection	Condition	Specified Condition
   z64-1 (+B) - C46- 104 (PCV+)	Always	Below 1 Ω
   z64-2 (PCV) - C46-105 (PCV-)	Always	Below 1 Ω
   z64-1 (+B) or C46- 104 (PCV+) - Body ground	Always	10 kΩ or higher
   z64-2 (PCV) or C46-105 (PCV-) - Body ground	Always	10 kΩ or higher

4. Reconnect the suction control valve connector.
   

5. Reconnect the ECM connector.
   

1. Connect the GTS to the DLC3
   

2. Turn the engine switch on (IG) and turn the GTS on.
   

3. Clear the DTCs (Click here).
   

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

5. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
   

6. Read the DTCs.
   

   Result

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

1. Replace the fuel supply pump assembly (Click here).
   

1. Bleed the air from the fuel system (Click here).
   

2. Perform PM forced regeneration (Click here).
   

   HINT:

   When fuel lines are disconnected, air may enter the fuel lines, leading to engine starting trouble. Therefore, perform forced regeneration and bleed the air from the fuel lines.

1. Perform supply pump initialization (Click here).
   

1. Replace the ECM (Click here).
   

1. Repair or replace the harness or connector.
   

1. Connect the GTS to the DLC3.
   

2. Clear the DTCs (Click here).
   

3. Turn the engine switch off for 30 seconds or more.
   

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

5. Confirm that the DTC is not output again.