High-Pressure Fuel System Actuator Override Test: Measurement

WARNING: This page is about a different car, the 2018 Nissan Titan XD. However, it is still accessible from the selected car via links, so may be relevant.

The HPCR Fuel Act Override Test in CONSULT must be used to run the electric lift pump and open and close the fuel pump actuator and fuel pressure relief valve. Refer to CONSULT Function .

Select "NO Command" in the drop menu.
Select Start.
NOTE: At this point in the test, the fuel pump actuator and fuel pressure relief valve are in the open position
Wait for system to run for 30 seconds.
Observe and record flow from the diagnostic line (steady stream of fuel or no fuel).
Select Stop.
Choose HPFS Pressure Relief Valve cdm close in the drop menu.
Select Start.
Wait for system to prime (30 seconds)
Observe and record flow from diagnostic line (steady stream of fuel or no fuel flow).
Select Stop.
Choose HPFS Pressure Relief Valve cdm open in the drop menu.
Repeat steps 7-10.
Choose HPFS actuator pump cdm close in the drop menu.
Repeat steps 7-10.
Choose HPFS actuator pump cdm open in the drop menu.
Repeat steps 7-10.
Select End.

Key off vehicle for at least 70 seconds. This ensures the lift pump stops pumping.

CAUTION: The HPCR Fuel Act Override Test cannot be run with the engine running.

NOTE: Make sure the diagnostic line is routed in a downward slope toward the breaker. Kinks or uneven hose can skew the test results.

Expected response of good fuel pump actuator and fuel pressure relief valve:

Trial	Component	State	Expected Response
1	Fuel Pump Actuator	Open	Steady Stream of Fuel
1	Fuel Pressure Relief Valve	Open	Steady Stream of Fuel
2	Fuel Pump Actuator	Open	No Fuel Flow
2	Fuel Pressure Relief Valve	Closed	No Fuel Flow
3	Fuel Pump Actuator	Closed	No Fuel Flow
3	Fuel Pressure Relief Valve	Open	No Fuel Flow