DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
INSPECT FUEL SUPPLY PUMP (SUCTION CONTROL VALVE)
CHECK HARNESS AND CONNECTOR (SUCTION CONTROL VALVE - ECM)
CHECK WHETHER DTC OUTPUT RECURS
REPLACE FUEL SUPPLY PUMP
REPAIR OR REPLACE HARNESS OR CONNECTOR
REPLACE ECM
CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED
DTC P0627 Fuel Pump Control Circuit / Open
DESCRIPTION
Refer to the System Description ().
P0627| DTC Detection Drive Pattern | DTC Detection Condition | Trouble Area |
| Idling for 1 second | Even though the CPU (command area inside ECU) is outputting the suction control valve operation duty, the output monitor signal is absent for 0.5 seconds (1 trip detection logic). | Open or short in suction control valve circuit
Suction control valve
ECM
|
Related Data List| DTC No. | Data List |
| P0627 | Fuel Press |
For more information on the fuel supply pump (suction control valve) and the common rail system, refer to the System Description ().
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 / Data List / Fuel Press.
Under a stable operating condition such as idling, Fuel Press is within +/-5 MPa of Target Common Rail Pressure.
WIRING DIAGRAM
INSPECTION PROCEDURE
After replacing the ECM, the new ECM needs registration () and initialization ().
After replacing the fuel supply pump, the ECM needs initialization ().
- 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 (SUCTION CONTROL VALVE) |
Disconnect the suction control valve connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| 1 - 2 | 20°C (68°F) | 1.9 to 2.3 Ω |
| 2.CHECK HARNESS AND CONNECTOR (SUCTION CONTROL VALVE - ECM) |
Disconnect the suction control valve connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance (Check for open):
for LHD| Tester Connection | Condition | Specified Condition |
| z64-2 (PCV) - C45-105 (PCV-) | Always | Below 1 Ω |
| z64-1 (+B) - C45-106 (PCV+) | Always | Below 1 Ω |
for RHD| Tester Connection | Condition | Specified Condition |
| z64-2 (PCV) - C46-105 (PCV-) | Always | Below 1 Ω |
| z64-1 (+B) - C46-106 (PCV+) | Always | Below 1 Ω |
- Standard Resistance (Check for short):
for LHD| Tester Connection | Condition | Specified Condition |
| z64-2 (PCV) or C45-105 (PCV-) - Body ground | Always | 10 kΩ or higher |
| z64-1 (+B) or C45-106 (PCV+) - Body ground | Always | 10 kΩ or higher |
for RHD| Tester Connection | Condition | Specified Condition |
| z64-2 (PCV) or C46-105 (PCV-) - Body ground | Always | 10 kΩ or higher |
| z64-1 (+B) or C46-106 (PCV+) - Body ground | Always | 10 kΩ or higher |
| 3.CHECK WHETHER DTC OUTPUT RECURS |
Connect the intelligent tester to the DLC3
Turn the ignition switch to ON and turn the tester on.
Start the engine and idle it for 1 second.
Enter the following menus: Powertrain / Engine / DTC.
Read the DTCs.
Result| Result | Proceed to |
| P0627 is output | A |
| No DTC is output | B |
| 4.REPLACE FUEL SUPPLY PUMP |
Replace the fuel supply pump ().
| 5.REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 7.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED |
Connect the intelligent tester to the DLC3.
Turn the ignition switch off.
Start the engine and idle it for 1 second.
Confirm that the DTC is not output again.
- Perform the following procedure using the tester to determine whether or not the DTC judgment has been carried out.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Check that STATUS is NORMAL. If STATUS is INCOMPLETE or UNKNOWN, increase idling time.
