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"Well cant E-mail you beez me why but" (archive)
[ Follow Ups ] [ 7-series (E23) Message Board ] [ Msg. Board FAQ ]
Posted by Jens T.M.745 on September 03, 2001 at 10:14:50:

In Reply to: Re: Jens, what is the circuitry on the throttlebod posted by Jens T.M.745 on September 03, 2001 at 10:01:28:

As the wires go, on the engine side we have a Brown,Black,and Yellow wire.
On the TPS side we have a Black,Green, and Orange wire. First don't measure
between Black and ground. Measure between orange & Black on tps side or
Black and Brown on the eng side. Look closly and you will see the black wire
doesn"t stay the black wire through the connection. eng side black (is a
ref. ground not the same as battery ground' turns to orange. the brown 5v
pullup resistor curcuit wire turns into black on the tps side. So on one
side black is 5v and on the other side its ref. ground. (just dont know how
it happened) Anyway the yellow wire(linner resistor) turns to green. AT full
throttle on hte tps side, Black is 5v, orange is (ref ground) and green is
at it's peek 4.78v. with a voltage test from green (-) at. 4.78v and Black
5v ref. your tester should read the difference at .22v. This is the updated
prceedure from bmw in form of a service bulliten. You have to use a digital
voltmeeter never analog. (Analog will short the two together because of no
impedence. use at least a 20megohm meeter. hope this clears things up a bit.

Sincerely Jens

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