[T3] 72 FI

[Jim Adney]

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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