Quote:
Originally Posted by swamp2
Getting a bit too far OT. Getting an OBD system to work for this task would be difficult and integrating it with the simple and fairly low cost system I have speced out herein would be really difficult. As well it would not add any information we are looking for. Again, keep it simple and as low cost as possible for the task at hand. For example throttle position is 100% irrelevant to these tests.
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The problem with using OBD II scan tools and OBD data is that the data is processed data from the Powertrain Control Module (PCM or DME). The readings you get are not in real time and only what the PCM thinks is happening. Also the scan tool must process the information and then display the data. The delay would make coordinating live measurements to the processed data on the scan tool interesting.
Also there is another problem with using the connections in the “transmission tunnel” the M-DCT shifter is connected to a switch with a built-in control module. The M-Gear Selector Switch (M GWS) “consists of the selector lever with indicator, the housing with control module…..”. The M-Gear Selector Switch communicates through two networks.
“In addition to the PT-CAN connection; there is a LIN-bus connection built in to the M GWS for redundant communication with the M-DCT electronics”.
Interpreting the network signals from the M GWS will be a little more difficult than clamping on a low amp probe to wires in the center console (transmission tunnel).