Z Series E85 Z4 3.0i (N52) ROADST
-
By pressing the START/STOP button while the engine is ON (change status of terminal 15 to OFF)
and
Transmission position "D" or "R"
and
Road speed signal 0 km/h.
The parking lock is only released when the engine is ON. Reason: Only when the engine is ON is there enough
hydraulic pressure to open the parking lock (mechanical emergency release possible).
> E65, E66, E70
If the parking brake (EMF = "electromechanical parking brake") fails, the parking lock can still be applied.
Example: A fault in the system prevents the parking brake from being moved from "Hold" to "Park". In this case,
the EGS control unit will engage the parking lock after a prompt from the DSC (master control unit for the
electromechanical parking brake) and after a plausibility check.
The locking conditions are as follows:
•
E65, E66
-
Selector lever in position "N"
-
Speed 0 km/h
-
Engine OFF and ignition OFF
•
E70
-
Selector lever position "D" or "N" or "R" engaged
-
Speed 0 km/h
Warming-up program
The warming-up program is activated after each engine start with the engine temperature lower than approx.
60
°
C. In the warming-up program, the automatic transmission remains in the performance-orientated map E or
XS up to a certain temperature. Gearshift are only executed at higher speeds. This enables the engine and the
catalytic converter to reach their operating temperatures more quickly.
Up to a transmission oil temperature of approximately 35
°
C, the converter lockup clutch is neither controlled
nor closed.
Engine intervention
During the gearshift, the EGS control unit emits signals to influence the digital engine electronics (DME) or digital
diesel electronics (DDE).
The DME then retards the ignition timing for a few milliseconds.
The DDE reduces the fuel quantity for a few milliseconds by reducing the injection period.
This action briefly reduces the torque, improves shift quality, reduces the load on the transmission and shortens
the shifting time.
Downshift inhibitor
A downshift inhibitor prevents the transmission shifting to a lower gear until the engine speed is below the
maximum speed for the next gear down. The engine speed signal is transmitted by the DME/DDE to the EGS
control unit.
The downshift inhibitor prevents damage to the engine and transmission.
Reverse gear inhibitor
The reverse gear inhibitor electronically prevents reverse gear from being engaged when the vehicle is moving
SBT 6-speed automatic transmission E53, E60, E61, E63, E64, E65, E66, E70, E81, E83,
BMW AG - TIS
16.02.2013 10:51
Issue status (12/2007) Valid only until next DVD is issued
Copyright
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