Kenyon & Kenyon
Malfunction detection apparatus for detecting malfunction in evaporated fuel purge system
 An apparatus for detecting a malfunction in an evaporated fuel purge system for use in an internal combustion engine. The apparatus includes a vapor passage connecting a fuel tank to a canister for feeding fuel vapor from the fuel tank into the canister, a purge passage connecting the canister to an intake passage of the engine for feeding the fuel vapor adsorbed in an adsorbent in the canister into the intake passage, an air inlet passage connecting an air inlet port of the canister to the atmosphere, a first control valve provided for controlling a flow of the adsorbed fuel vapor from the canister to the intake passage, a pressure sensor provided for outputting a signal indicative of a pressure in the air inlet passage, a second control valve for controlling a flow of external air fed into the vapor passage from the air inlet port of the canister, and a malfunction detection part responsive to the signal outputted by the pressure sensor for detecting a malfunction in the evaporated fuel purge system. 
Toyota Jidosha Kabushiki Kaisha
F
F02M
inventional
Takayuki
Otsuka