06 A3 w/3.2 VR6 BUB
My mechanic and I have been chasing an interesting symptom. My coolant temp gauge has been malfunctioning, but it would seem this is due to either (or both) P2181 implausible signal, performance malfuntion in cooling system, and on another occasion, accompanied by P0018 G62 ECT lower limit exceeded (intermittent open ckt)
The point I want to address in this thread is that in each event, the coolant temp gauge in the instrument cluster appears to have been disabled by the ecu software due to the fault registering.
Upon clearing the fault, the gauge immediately pops up to where it should be with a warm engine.
The 3.2 in the 06 A3 seems to be a bit different from the other vag cars, in that it uses a single 2 pin ECT sensor for engine temp, and forwards this data to the instrument cluster module. This is different from the cars which use the 4 pin sender, wich would seem to send a signal DIRECTLY to the temp gauge, as well as a primary signal to the ECU.
I just wanted to share this observation, as neither myself, or my audi mechanic have seen this situation, and ask if anyone can confirm that this makes sense. Thanks.
My mechanic is a licensed vag com user, fyi.