So, I have an ECU on the bench and wanted to play with the gauge data (do some logging, etc). The tech line is supposed to be the serial data, but when I power up the ECU, I just have a constant pullup to +5V.
I have 12.5V at B+ and gnd on E1. Same pins I used to clock the data through the AUD.
Do I need something extra to make the serial line for the gauges go active? I tried a second ECU, just in case I had a dead one, but the same thing.
I put a scope on it, and it's a pretty solid nothing. Scoping the crystal shows lots of activity so I think the ECU is alive.
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The tech line to the gauges sends only ECT, Gear and Mode in a stream. At least the AIM-Dataloggers says this. I had also tryed to catch them with the k-line from my AIM-EVO4-Logger but it did not work.
If you find out more, please let me know.