DTC P0627 2AD-FHV

DTC P0627 Fuel Pump Control Circuit / Open

 

Description

Toyota fault code list DTC P0627

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

HINT:

  1. For more information on the supply pump (suction control valve) and the common rail system, refer to the system description.
  2. 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.

 

Reference: 
Engine Speed Fuel Pressure
Idling Approximately 37 to 43 MPa
2,500 rpm (No engine load) Approximately 57 to 63 MPa

 

Wiring diagram

Refer to DTC P0088.

Inspection procedure

 

NOTICE:

  1. After replacing the ECM, the new ECM needs registration and initialization.
  2. After replacing a supply pump, the ECM needs initialization.

 

1.INSPECT SUPPLY PUMP ASSEMBLY

Disconnect the B46 suction control valve connector.

  1. Disconnect the B46 suction control valve connector.

  2. Measure the resistance of the suction control valve.

     

    Standard resistance:

    Tester Connection Condition Specified Condition
    B46-1 - B46-2 20°C (68°F) 1.9 to 2.3 ?

  3. Reconnect the suction control valve connector.

 

  NG  
REPLACE SUPPLY PUMP ASSEMBLY
 
OK  
   
2.CHECK WIRE HARNESS (SCV - ECM)

Disconnect the B46 suction control valve connector.

  1. Disconnect the B46 suction control valve connector.

  2. Disconnect the B32 ECM connector.

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

     

    Standard resistance:

    Tester Connection Specified Condition
    B46-1 - B32-42 (PCV+) Below 1 ?
    B46-2 - B32-41 (PCV-) Below 1 ?
    B46-1 or B32-42 (PCV+) - Body ground 10 k? or higher
    B46-2 or B32-41 (PCV-) - Body ground 10 k? or higher

  4. Reconnect the suction control valve connector.

  5. Reconnect the ECM connector.

 

  NG  
REPAIR OR REPLACE HARNESS AND CONNECTOR
 
OK  
   
3.CHECK WHETHER DTC OUTPUT RECURS

  1. Connect the intelligent tester to the DLC3

  2. Turn the ignition switch on (IG) and turn the tester ON.

  3. Clear DTCs.

  4. Turn the ignition switch on (IG) and leave it for approximately 1 minute.

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

  6. Read the DTCs.

     

    Result:
    Display (DTC Output) Proceed to
    P0627 A
    No output B

 

  B  
CHECK FOR INTERMITTENT PROBLEMS
 
A  
   
REPLACE ECM 
2AD-FHV