Does anybody know how the 4 speed auto operates? Relays/solenoids/switches/sensors?
Heres my situation
A few days ago my Check Engine Light came to life. I assumed this was to do with the plenum mods I had recently done. My hand held OBD scanner was unable to identify the issue or clear the fault.
But then today.... Shifting from N to D, there was a longer gearchange pause than normal.
Half an hour later, shifting from P to D and I noticed the pause was much longer.
Then leaving home at 5pm, reversed out, shifted to D... and I get nothing. Engine revs but no transmission load, just like I was still in N.... i check its actually in D, massive pause, then the car moves.
So naturally Im a bit worried...
Get to the first slow corner, accelerate and the car revs but doesnt go faster...
At this point I Shift into tiptronic and thankfully I take off normally. Driving along I switch back to D and all seems normal, until I get to a roundabout.... and the thing wont accelerate out of it.
So the situation is: When in D, 1st gear does not engage. You can feel a very weak shudder thru the car, but no transfer of power to the rear wheels. But when in tiptronic, all 4 gears work perfectly.
So what im trying to work out is; what part of being in D controls the way 1st gear engages? How is it that I can still use 1st gear in tiptronic but not in D? And has anyone else had this happen?
Im not stressed about it.... much