3 Series E46 316i (N45) SAL
crankshaft. The crankshaft sensor is required in order to achieve fully sequential fuel injection (individual fuel
injection for each cylinder at optimum firing point).
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Accelerator pedal module
The accelerator pedal module identifies the position of the accelerator pedal.
Using this information, the DME control unit calculates the required position of the Valvetronic or the throttle
valve while taking other criteria into account (for N45: only position of throttle valve).
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Air mass meter
The air mass meter records the air mass which is drawn in. The DME control unit calculates the required load
conditions using this information (base value for fuel injection period).
>E81, E87, E90, E91, E92, E93
The air mass meter in the N46B20 and N45TU2/N46TU2 engines is not used to record the signal. As on
previous models, the intake air temperature sensor is installed in the housing of the air mass meter (exception:
no catalytic converter is fitted).
The DME calculates the air mass using a model. The most important input factor is the Lambda control signal.
Here, the oxygen sensor (control sensor) is located close to the engine.
From 06/2006, the signal is again recorded via the air mass meter in countries where fuel quality is inadequate.
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Coolant temperature sensor
The coolant temperature sensor records the coolant temperature in the engine cooling circuit.
The coolant temperature is the measured variable used in these calculations, for example: injection quantity and
nominal idle speed.
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Temperature sensor on radiator outlet
The temperature sensor on the radiator outlet records the coolant temperature downstream of the radiator.
The DME control unit requires information on the coolant temperature at the radiator outlet to activate the
radiator fan, for example.
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Thermal oil level sensor (not E60)
The thermal oil level sensor delivers 2 signals to the DME control unit: engine oil temperature and oil level (for
N45 on the E46: oil level only).
The oil level is required for checking the level of oil in the engine.
>E81, E87, E90, E91, E92, E93
The spark-ignition engines no longer have a dipstick. The oil-level sensor supplies a signal for the electronic
engine oil level control to the DME control unit.
The engine oil level is displayed electronically on the instrument cluster through the on-board computer functions
(bars).
If the vehicle is equipped with a Central Information Display (CID), the engine oil level is displayed under
"Service requirements" in the "Service" menu.
[more ...]
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Oil condition sensor
> E60 only
The oil condition sensor increases the function range of the thermal oil level sensor.
The oil condition sensor measures the following ratings:
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Engine oil temperature
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Oil level
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Engine oil quality
The engine management then evaluates these measurements. The oil condition sensor is connected to the
SBT Engine control for N45, N46 E46, E60, E81, E83, E85, E87, E90, E91, E92, E93
BMW AG - TIS
22.01.2013 17:30
Issue status (12/2007) Valid only until next DVD is issued
Copyright
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