RXTASY1

My tach and the tach on my AVCR read about 50% of the actual RPM?
My Haltech RPM reads accurately?
I have swapped the trailing coil and grounded everything to death and it still does it?
Any ideas?

Ryde _Or_Die

Someone just had a post where they had the same problem with the s-afc. Is it all of the sudden or is it a new install?

RXTASY1

It's all of a sudden. Was working just fine.
The thing that gets me is, all the devices are reading from the same lead?

Ryde _Or_Die

So all other readings are accurate as far as you know? Damn that is strange, the avc-r gets the tach reading from where exactly since you have a haltech I believe?

RXTASY1

It gets it off the trailing coil.
I'm wondering if there is some kind of resistor or something that has gone bad?

Ryde _Or_Die

Well something had to change somewhere for the signal to change. I would guess it would some sort of fuse/resistor problem. I mean your car runs the same though? A ground hasn't fallen off or broke? More than likely its something simple that you're just not seeing. Those are the most difficult ones to fix sometimes