ENGINE   113.986 in MODEL 215 with CODE (494) USA version

Type 171 77 Activated charcoal canister Y58/4 Activated charcoal filter shutoff valve The activated charcoal filter shutoff valve is located on the activated charcoal canister, in front of the rear axle on the vehicle underbody.
		P47.31-2130-11

Models 203, 209 77 Activated charcoal canister Y58/4 Activated charcoal canister shutoff valve The activated charcoal filter shutoff valve is located above on the activated charcoal canister, in the wheelhouse at the right rear.
		P07.61-2428-01

Models 215, 220 77 Activated charcoal canister Y58/4 Activated charcoal canister shutoff valve The activated charcoal filter shutoff valve is located above on the activated charcoal canister, in the wheelhouse at the left rear.
		P47.31-2131-01

Task The activated charcoal filter shutoff valve closes off ventilation / venting of the activated charcoal canister to allow a leaktightness test on the fuel system (leak test). Design The activated charcoal filter shutoff valve consists of a solenoid which closes the activated charcoal filter shutoff valve when gases are flowing. Additionally a mechanical safety valve is installed.

Function The activated charcoal canister shutoff valve is actuated at the ground end by the ME control unit (N3/10) to conduct a leak test. If the activated charcoal canister shutoff valve is faulty (the valve does not open anymore) then a mechanical safety valve takes over aeration of the activated charcoal canister (from about -25 mbar).