NVLD(Natural Vacuum Leakage Detection) is located between the
canister and the fuel tank air filter. NVLD is to detect leaks
equivalent to a 0.5 mm hole in the fuel tank, canister and hoses. When
the engine has been running, the temperature of the fuel in the fuel
tank is raised slightly. When the engine is shut off, the temperature of
the fuel should drop. The ideal gas law states that in a sealed system
the pressure drops proportionately to a drop in temperature.
[No leak]
[With 0.5mm leak]
While the engine is shut off, ECM monitors a pressure switch
that is built into the NVLD for detecting slight drop in pressure. If
the switch change is not detected after an engine shut down, it assumes
there is a leak in the sealed system.
Removal 1. Turn the ignition switch OFF and disconnect the battery negative (-) cable. 2. Lift the vehicle. 3. Disconnect the canister close valve connector (A). 4. Disconnect the ventilation hose (B) ...
Removal • Be sure to read and follow the “General Safety Information and Caution” before doing any work related with the high voltage system. Failure to follow the safety instructions may result in serious electrical injuries. • Be sure to shut off the high voltage circuit according ...