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Hi Richard, I'm glad to help. The mechanic is the only one that can check power to the NVLD Pump because it must be actuated with the scan tool to check power. Check for a broken wires or a pin pust out on the NVLD connector. If you don't know what fuses to check then turn the key on and with a test light check all the fuses under the hood. If they are all good then you'll need it checked out further by a certified mechanic. If you do find a fuse blown and it turns out to be the one for the NVLD then replace the pump because its most likely the culprit that blew the fuse. Hope this helps and have an awesome day Richard.
The NVLD (natural vacuum leak detection) this uses a natural device that follow gas principles,the device is a open vacuum switch,a normally closed solenoid,it is actuated by a solenoid and a diaphragm,The NVLD is located on the atmospheric vents side of the canister on top of the canister outlet
Check the vacuum hoses not even a pin hole,Follow vacuum hose from throttle body to the evap purge solenoid diconnect line at eps can side and hook a hand vacuum pump to eps turn on key don't start add ten inches vacuum no drop in vacuum replace evap purge solenoid if it works it's probally the nvld assembly
Vehicles equipped with NGC engine control modules use an NVLD pump
and system. Vehicles equipped with JTEC engine control modules use a
leak detection pump. Refer to Leak Detection Pump (LDP) for additional
information. The Natural Vacuum Leak Detection (NVLD) system is
the next generation evaporative leak detection system that will first be
used on vehicles equipped with the Next Generation Controller (NGC).
This new system replaces the leak detection pump as the method of
evaporative system leak detection. This is to detect a leak equivalent
to a 0.020 (0.5 mm) hole. This system has the capability to detect holes
of this size very dependably.
Removal & Installation
Raise and support vehicle.
Remove left-rear tire.
Remove plastic shield (4) in front of left-rear tire. Access to
both the EVAP canister (1) and NVLD pump (6) is from the area in front
of the removed tire.
Disconnect electrical connector at NVLD pump.
Remove vapor line at NVLD pump. Pry outward on tab (3) and rotate
pump (6) clockwise about 70 for removal.
Remove NVLD pump O-ring (5) from EVAP canister (1).
Install new NVLD pump O-ring (5) to EVAP canister (1).
Position NVLD pump (6) into EVAP canister (1).
Rotate pump (6) until tab aligns with notch in EVAP canister (1).
Carefully install vapor/vacuum lines to NVLD pump.
The vapor/vacuum lines and hoses must be firmly connected. Check
the vapor/vacuum lines at the NVLD pump, filter and EVAP canister purge
solenoid for damage or leaks. If a leak is present, a Diagnostic Trouble
Code (DTC) may be set.
Connect electrical connector to pump.
Install plastic shield in front of left-rear tire.
THE NVLD ASSEMBLY IS LOCATED UNDER THE VEHICLE ON THE METAL PLATE BOLTED TO THE FRONT ALUMINUM K FRAME..JUST BEHIND TRANS DIFFERENTIAL..HAS SOME HOSES AND AND AN ELECTRICAL CONNECTOR GOING TO IT..BLACK PLASTIC HOUSING..HOSES LEAD TO CANISTER BEHIND FRAME..DISCONNECT HOSES,ELECTRICAL..MARK THEM IF YOU NEED TO..BUT ALSO LOOK FOR A BROKEN WIRE NEAR NVLD AT CONNECTOR..UNBOLT ASSEMBLY FROM FRAME..I YOU HAD A NEW ONE YOU WILL SEE WHAT IT LOOKS LIKE..I HOPE THIS HELPS