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Emergency Running Programs in the Easytronic (M20 MTA) Note: The purpose of the emergency running programs is to guarantee the ability of the vehicle to be used insofar as is possible. This takes place, even if there is a fault, in a manner which is not critical for the driver. If certain signals are missing it is sufficient to draw on substitute/reference values, an emergency program is activated for other signals, if they are not available to the Easytronic control unit, or the vehicle is shut down. The sections below describe how the vehicle behaves, depending on the emergency running program active. A distinction is made between faults with fault memory entries and faults without fault memory entries. The M20 MTA system provides 4 interfaces for informing the driver of faults or problems with the system:
Procedure When Faults Occur The MIL indicator light is only actuated if the results of a separate emissions test clearly indicate that the current transmission fault will result in the legal emissions limits being exceeded. If a fault occurs and the SVS indicator light is actuated, emergency gearshift map 1 is activated. Neither of the emergency gearshift maps enables manual gear changes. Manual Mode, Sport Mode and Winter Mode are then deactivated. If the "F" is flashing in the display, the SVS indicator lamp will also be actuated. If safety-critical faults have occurred, the system is switched off and the vehicle cannot be driven any further. Emergency gearshift map 1 The purpose of emergency gearshift map 1 is to inform the driver that there is a fault in the system. It can be recognised from the different gearshift points. In this event, the vehicle must be taken immediately to a service workshop for diagnosis. The SVS indicator light and emergency gearshift map 1 are activated in the event of faults in the MTA system if these signals can also be read by other sensors, e.g. the wheel speed sensor signal can also be read by the transmission input speed sensor. In this event, emergency gearshift map 1 is active. If another fault occurs, e.g. the transmission input speed sensor fails, the system is shut off. Emergency gearshift map 2 Emergency gearshift map 2 is activated if the engine control unit detects a fault and consequently reduces the maximum engine speed by lowering the fuel shut-off point. This fault is communicated by the engine control unit via the CAN and the transmission control unit switches to emergency gearshift map 2. The shift points selected by the transmission control unit are such that it is not possible to exceed the reduced engine speed even when changing down. |
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