3 Series E46 316i (N45) SAL
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Multi-function steering wheel or cruise control
On vehicles with N46, there is no separate control unit for the cruise-control system.
> E46, E83
The multi-function steering wheel (MFL) has an MFL button pad on its right-hand side for operating cruise
control. The signals for cruise control are evaluated by the DME control unit.
> E85
The signals are transferred via a separate wire from the steering-column stalk to the DME.
> E60, E81, E87, E90, E91, E92, E93
The signals for controlling the cruise-control system are transmitted onto the bus system from the steering
column switch cluster (SZL).
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DME control unit
2 additional sensors are located on the board in the DME control unit: a temperature sensor and an ambient-
pressure sensor.
The thermal monitoring of components in the DME control unit is carried out by the temperature sensor.
The ambient pressure is required to calculate the mixture composition. The ambient pressure reduces as the
height above sea level increases.
In the N46, the DME control unit is connected to the vehicle's system via the engine wiring harness and vehicle
wiring harness (2 connector chambers).
The DME control unit is connected to the rest of the bus system by the PT-CAN (Powertrain CAN) via the
following gateway:
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E46, E83, E85: Instrument cluster (KOMBI)
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E81, E87, E90, E91, E92, E93: Junction box electronics (JBE)
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E60: Body gateway module (KGM)
DME control unit on N45/N46 engine: [more ...]
DME control unit on N45TU2/N46TU2 engine: [more ...]
The digital engine electronics (DME) in the N46 control the following actuators:
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Valvetronic actuator
The air flow to the engine during throttle-free operation is adjusted by the variable valve lift and not the throttle
valve.
Valvetronic is driven by an electric motor. The Valvetronic actuator is mounted on the cylinder head. The
Valvetronic actuator uses a worm gear to drive the eccentric shaft in the cylinder head oil chamber.
The eccentric shaft sensor provides the DME control unit with an indication of the position of the eccentric shaft.
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Actuator for variable suction unit
The N46B20 has a differential air intake control (DISA).
The DISA actuator drives one sliding sleeve per cylinder.
The sliding sleeves lengthen or shorten the intake port.
This means that a more ample torque curve is reached at low engine speeds without a loss of engine output at
higher engine speeds.
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Electric throttle-valve actuator
The DME control unit calculates the position of the throttle valve using the position of the accelerator pedal
amongst other variables.
On the N45/N46, the position of the throttle valve in the electric throttle-valve actuator is monitored by
2 potentiometers (N45TU2/N46TU2: contact-free via magnetoresistive sensors).
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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