3 Series E46 316i (N45) SAL
engine management via a bit-serial data interface. Power is supplied via terminal 87.
[more ...]
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Inlet pipe pressure sensor
The suction pipe pressure sensor measures low pressure in the suction unit (N46 only).
In engines with Valvetronic, for example, a partial vacuum of approximately 50 millibars is set in idle speed. The
inlet pipe vacuum acts as a substitute value for the load signal.
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2 knock sensors
Both knock sensors detect combustion knock.
Knock sensor 1 monitors cylinders 1 and 2. The other knock sensor monitors cylinders 3 and 4. The DME
control unit performs cylinder-selective knock detection.
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Oxygen sensors
LSU4.9 control sensors are used on the N45TU2/N46TU2 (N45/N46: LSU4.2)
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N46 (N46 and N46OL) and N46TU2 (N46UL and N46OL)
For every 2 cylinders, an oxygen sensor is installed upstream of the catalytic converter and downstream of
the catalytic converter (cylinders 1 and 4, cylinders 2 and 3).
Exception: Left-hand drive vehicles with manual transmission have only 2 oxygen sensors and one air-gap
insulated exhaust manifold
[for further information, please refer to SI Technology (SBT) 18 01 03 060]
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N45 / N46 (N45 / N46UL) and N45TU2 (N45OL)
This engine has 2 oxygen sensors.
The oxygen sensor upstream of the catalytic converter (control sensor) records the composition of the
exhaust gas.
The oxygen sensor downstream of the catalytic converter (monitoring sensor) monitors the function of the
catalytic converter.
The oxygen sensors are heated by the DME control unit so that they reach their operating temperature
more quickly.
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Clutch module
In vehicles with manual transmission, the clutch module records the clutch position at the clutch pedal (clutch
depressed: clutch switch open; clutch not depressed: clutch switch closed). The clutch module comprises the
clutch switch and electronic evaluation unit.
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Brake light switch
Two switches are fitted in the brake light switch: The brake-light switch and the brake light test switch (duplicated
as a safety measure). The signals enable the DME control unit to determine whether or not the brake pedal is
depressed.
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Oil pressure switch
The oil pressure switch provides the DME control unit with an indication of whether or not there is sufficient oil
pressure in the engine.
The oil pressure switch is directly connected to the DME control unit.
> E46
The oil pressure switch is connected to the instrument cluster. The signal is delivered by the instrument cluster
via the K-CAN.
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DSC control unit
The DSC control unit sends the signal containing information on the vehicle's road speed via a separate line
(redundant to PT-CAN) to the DME control unit. This signal is required for several functions e.g. the idle speed
control.
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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