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
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.
Install left-rear tire.
Have a nice day (remember rated this help).