6 Series E64 650i (N62TU) CONVER
When the vehicle is in motion and there is a sudden acceleration or the throttle is closed, the fuel injection
period can be adjusted. If the injectors are still open, the mixture at every valve can be adjusted by extending or
shortening the fuel injection period. This achieves an improved engine response.
Ignition-circuit monitoring
The current in the primary coil for the ignition coil is used to monitor the ignition circuit. When the engine is
switched on, the current must stay within specific values during certain time thresholds.
The ignition diagnosis monitors the:
•
Primary power circuit for the ignition coil
•
Ignition wiring harness
•
Secondary power circuit for the ignition coil with the spark plug
The ignition-circuit monitoring can detect the following faults:
•
Short circuit at the primary end of the ignition coil
•
Short circuit at the secondary end of the ignition coil
•
Defective spark plug
•
Break in wire to actuator
•
Defective ignition output stage
The following are not detected:
•
Intermittent faults such as loose contacts in the wire to the actuator
•
Spark-over in high-tension circuit parallel to spark gab where a short-circuit in the coil does not develop
Alternator actuation (bit-serial data interface)
The following functions have been implemented in the DME control unit for the alternator with bit-serial data
interface (BSD):
•
Switching the alternator on and off using defined parameters
•
Specification of the alternator's maximum permissible power consumption
•
Calculation of the input torque for the alternator based on the power consumption
•
Control of the alternator's response when higher electrical loads are connected (load-response function)
•
Diagnosis for the data line between the alternator and DME control unit
•
Storage of faults which develop in the alternator in the fault memory of the DME control unit
•
Actuation of the charge-current indicator light in the instrument cluster via bus connection
•
Introduction of intelligent alternator regulation:
> from 03/2007 in the E60, E61
> from 09/2007 in the E63, E64, E70
The principal function of the alternator is also guaranteed when communication between the alternator and DME
control unit is interrupted.
The following fault causes can be distinguished in fault memory entries:
•
Overheating protection:
The alternator is overloaded. For safety reasons, the alternator voltage is reduced until the alternator has
cooled down (charge telltale light does not light up).
•
Mechanical fault:
There is a mechanical block in the alternator. or: The belt drive is defective.
SBT 8-cylinder spark-ignition engine N62TU E60, E61, E63, E64, E65, E66, E70
BMW AG - TIS
06.02.2013 10:29
Issue status (12/2007) Valid only until next DVD is issued
Copyright
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