MODEL   215 with ENGINES 113.960, 137.970

Shown on Engine 119 75 Fuel tank 77 Activated charcoal canister N3/10 ME control unit Y58/1 Purge control valve a Pressurization line
		P47.30-0282-06

Shown on engine 120 75 Fuel tank 77 Activated charcoal canister 93 Expansion reservoir (only with optional ski bag) M16/3 Right EA/CC/ISC actuator Position on left of engine M16/4 Left EA/CC/ISC actuator Position on right of engine N3/11 Left ME-SFI [ME] control unit N3/12 Right ME-SFI [ME] control unit Y58/2 Switchover valve Left regeneration Y58/3 Switchover valve Right regeneration a Pressurization line
		P47.30-0273-06

The evaporative emission control system prevents fuel vapors escaping to atmosphere. This is done by storing the fuel vapors temporarily in the activated charcoal canister. When the engine is running, the fuel vapors stored in the activated charcoal canister, are drawn off through the purge control valve and combusted in the engine. The activated charcoal canister is purged (re-generated) at: - coolant temperature > 70°C - blocking time after engine start elapsed, approx. 2 minutes - engine not in deceleration mode The purge quantity is controlled by the ME-SFI control unit operating the purge control valve. The purge quantity is determined by constantly opening and closing the purge control valve for on and off periods of various lengths.

The idle speed control prevents changes in engine speed resulting from purging. Depending on the level of charge of fuel vapor in the activated charcoal canister, the fuel-air mixture becomes richer or leaner. Air admission to fuel tank Air is admitted through the activated charcoal canister. Here either air is sucked out of the aeration/vent line on the activated charcoal canister or fuel vapors are sucked out of the activated charcoal canister into the fuel tank. Air release from fuel tank The fuel tank is vented through the activated charcoal canister. The fuel vapors flow to the activated charcoal canister, where they are stored or drawn into the intake manifold in case of simultaneous regeneration.

Vent valve On vehicles fitted with a vent valve the fuel tank is vented from a pressure of 30 to 50 mbar, and air admitted at a vacuum of 1 to 16 mbar. In addition, this prevents overfilling the fuel tank. as of MY 98 During refueling the fuel vapors are collected at the filler neck and passed to the activated charcoal filter (ORVR = Onboard Refueling Vapor Recovery). Large activated charcoal canister.

Engines with charging (compressor or turbocharger) A check valve in the purge line prevents the boost pressure building up toward the activated charcoal canister.

P47.30-2135-09

Model 215 from chassis no. A046659 (ca. 23.3.05), without and model 220 from chassis no. 469233 (ca. 23.3.05), without with ski bag (code 282) or cool box in the rear backrest (code 308) or with retrofited additional vent valve (76/1) 75 Fuel tank 76 Vent valve (standard) 76/1 Vent valve (additionally installed from series production breakpoint or retrofitted) 77 Activated charcoal canister

N3/10 ME-SFI [ME] control unit Y58/1 Purge control valve A to intake manifold B Air admission C Line on fuel tank D Line on purge control valve

The additional vent valve (76/1) prevents vacuum reaching from the intake manifold over the activated charcoal canister to the fuel tank when purging is released. This closes the valve just as soon as a membrane has vacuum from the activated charcoal canister applied to it. If an overpressure or vacuum acts upon another connection on the valve then it opens immediately. This means that the aeration / venting of the fuel tank over standard vent valve (76) is still unrestricted.

Pay attention to installation position of vent valve (76/1). Check aeration at activated charcoal canister for dirt (e.g. dust, spider webs).

	ME-SFI control unit, location/task/design/function		GF07.61-P-5000F
	Coolant temperature sensor, location/task/design/function	Engine 113, 137	GF07.04-P-5026A
	Purge control switchover valve, location/task/design/function		GF47.30-P-4030L
	Activated charcoal canister, location/task/design/function		GF47.30-P-3102F
	Purge control valve actuation, function		GF07.61-P-3013F
	Purge system with leak test function		GF47.30-P-3016L
	On-board refueling vapor recovery function	as of 9/00	GF47.10-P-3004B
		up to 8/00	GF47.10-P-3004A