ENGINE   113.991 in MODEL 215

A1 Instrument cluster A9 Refrigerant compressor B11/4 Coolant temperature sensor B40 Oil sensor (oil level, temperature and quality) L5 Crankshaft position sensor M4/7 Engine and AC electric suction fan with integrated control N3/10 ME-SFI [ME] control unit N22 AAC [KLA] control and operating unit CAN-B CAN data bus structure (Controller Area Network) CAN-C CAN data bus engine (Controller Area Network)
		P07.61-2784-06

The ME-SFI [ME] control unit indirectly actuates the electric suction fan motor and air-conditioning system continuously. The fan specified speed is transmitted by the ME-SFI [ME] control unit via a pulse width modulated signal (PWM signal). The on/off ratio is 10 to 90%. Meaning: 10% Electric suction fan "OFF" 20% Electric suction fan "ON", minimum rpm 90 % Electric suction fan "ON", maximum rpm

The AAC [KLA] control and operating unit sends the status of the automatic air conditioning to ME-SFI [ME] control unit over the CAN data bus. The fan specified speed is dependent on this and on the coolant temperature. The electric suction fan for the motor and air-conditioning unit continues to run up to 5 minutes when ignition "OFF", if the maximum specified value for the coolant temperature or the engine oil temperature is exceeded. If the battery voltage drops excessively during this operation, engine-off running is suppressed. Models 211, 219, 230: If case of SBC undervoltage, the fan speed is limited and a fault code is stored in the ME-SFI [ME] control unit.

	Crankshaft position sensor - location/task/design/function		GF07.04-P-4116AM
	Coolant temperature sensor - location/task/design/function		GF07.04-P-5026AM
	ME-SFI control unit - location/task/design/function		GF07.61-P-5000AM
	Oil sensor - location/task/design/function		GF18.40-P-4111AM