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Bug 1: Pedal Potentiometer

currently, I am in a phase of bug fixing, before I will go into re engineering the battery to a double capacity. One of the bugs is, that I don't get a stable pot 2. Basically the offset of pot 2 is jumping. Not completely random, but from one plateau to another occasionally. This leads to throttle 2 error messages in my Tesla SDU software. With throttle two disconnected, the car drives perfect. Possible error causes for could be:

• potentiometer defect

• wrong wiring

• bad connector

• emv problem?

• problem in SDU board electronics

Because Porsche 986 ptentiometers are known to fail, I bought another used one and changed it. Same problem as before. Now I connected the old one to an arduino running the digits to percent code from SDU. Looks more or less perfect to me:

Edited

Looks like maybe some capacitance difference between channels for some reason.

If the pot2 offset is changing, this sounds like a bad connection of the pot2 minus wire. If it is possible I propose to connect a multimeter at pot2+ and pot2-, to check whether the voltage is stable.

A few steady throttle position step logs might also help see what's going on. Like 5, 10, 15, 25, 35, 50% etc. But hold each for 1/4 second or so.

And to uhi's point, are connections good? Bad crimps can be easy to miss.