Engine torque limitation
| Engine torque limitation |
During certain shifting occurrences, the engine torque is reduces so that the shifting is performed as smoothly as possible and the wear on the transmission is reduced.
To make sure this happens, the control module sends a signal from pin 25 to Motronic pin 51 or to Trionic pin 13. The transmission control module is aware of when it should shift gear and informs the engine management system of this. The actual torque reduction is then performed by the engine control module, which retards the ignition and decreases the torque.
In normal position the voltage on the signal lead is B+. When the transmission control module requests torque limitation, it pulls down pin 13 to 0 V (ground) for a period of time proportional to the requested reduction. The maximum length of time is 250 ms.
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