ENGINE   275.950 /980 in MODEL 215

Illustrated model 215, 220, 230, 240 B28/7 Pressure sensor downstream of throttle valve actuator B37 Accelerator pedal sensor L5 Crankshaft position sensor M16/6 Throttle valve actuator N3/10 ME control unit N15/3 ETC [EGS] control unit N47-5 ESP, SPS [PML] and BAS control unit S9/1 Stop lamp switch X11/4 Data link connector Y62 Fuel injection valves CAN Data bus
		P30.20-2072-06

The task of the emergency running consists of enabling a safe continuation of journey if interference occurs at the electronic accelerator. Accelerator pedal sensor, emergency mode If a Hall sensor fails, the system switches over to the second Hall sensor. The throttle valve opening is limited to approx. 60%. In addition, the throttle valve opening rate is dynamically limited, in other words the throttle valve opens with a time delay. If the result of the plausibility check is negative, or if both potentiometers are faulty, only the idle speed is then controlled.

Throttle valve actuator, emergency mode (electrical) If a potentiometer fails, the system switches over to the second potentiometer. The signal from the pressure sensor downstream of throttle valve actuator serves as an additional comparative size. If the plausibility check is negative or if both potentiometers are faulty, the throttle valve adopts a mechanical emergency running position (approx. 8 to 10°) which is fixed by the spring capsule in the throttle valve actuator (EPC malfunction indicator lamp comes on).

Throttle valve actuator, emergency mode (mechanical) If the actuator motor is defective or there are other faults present, the power supply to the throttle valve actuator will be shut off. The throttle valve is resting against the mechanical stop (spring capsule) as a result of which the throttle valve opening is maintained constantly at approx. 8 to 10°. In neutral at engine speeds of > 1400/min, the fuel injection valves are deactivated and at engine speeds of < 1200 rpm actuated again. While driving, depending on the engine load, engine speed is controlled by switching the cylinders on and off on the fuel side. The maximum engine speed is approx. 1800 rpm and is fixed by the mechanical stop.

Faults detected by the accelerator pedal sensor (B37) and the throttle valve actuator are stored in the fault memory and can be read out and deleted with STAR DIAGNOSIS. Emergency mode is recognizable on a clearly surging engine running.

	ME-SFI control unit, location/task/design/function		GF07.61-P-5000M
	Accelerator pedal sensor, location/task/design/function		GF30.20-P-4010M
	Throttle valve actuator, location/task/design/function		GF30.22-P-4101M
	Fuel injection valve, location/task/design/function		GF07.03-P-5004M
	Crankshaft position sensor, location/task/design/function		GF07.04-P-4116M
	Pressure sensor downstream of throttle valve actuator, location/task/function		GF07.04-P-5049M
	ETC control unit, location/task	Selector lever position information P/N and drive position engaged. Transmission 722.6	GF27.19-P-4012G