[T3] 72 FI
Jim Adney
jadney at vwtype3.org
Sat Jan 19 07:35:31 PST 2013
On 19 Jan 2013 at 7:48, Dennis Stiefel wrote:
> The TPS on modern cars dose tell the computer a percentage of how far the
> throttle is open. For example most modern cars with automatic trans needs
> this info to compare with vehicle speed and other things to know when to
> change gears and lock the torque converter among other things so it must
> know an exact percentage of that. I thought the 72-3 done this. Why do they
> need 5 pens just to know idle and WOT position. My son's 88 golf's digifant
> II TPS just dose idle and WOT but is a lot different than the one on our FB.
There's no variable resistor in our TPSs. For your '72 with 5 pins:
One pin is common
One pin indicates idle position
One pin indicates WOT
Two pins give alternating pulses as the throttle is opening, but not
as it closes.
It's a pretty simple system.
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Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
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