924Board.org

[Mavfan]

ok on the 88 924s, i located the throttle possition sensor, but i need the output voltage lead wire. there are three colors of wires, white, white with a black stripe and brown. thanks
_________________
Black 1988 924S SE
Red 1985.5 944

http://mavfan72.tripod.com/
http://www.cardomain.com/id/mavfan

Video:
http://video.google.com/videoplay?docid=-5193982457901018136

[Paul]

All it does is provide a path to ground (the brown wire) for the white wires.
_________________
White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.

[Mavfan]

Ok, so to clarify...

White wire = communication from TPS to computer
White/Black = communication from computer to TPS
Brown = Ground wire

Thanks--Please verify that these are correct...
_________________
Black 1988 924S SE
Red 1985.5 944

http://mavfan72.tripod.com/
http://www.cardomain.com/id/mavfan

Video:
http://video.google.com/videoplay?docid=-5193982457901018136

[Paul]

Both white wires come from the computer. The TPS changes their state, grounded or not grounded based on the position of the throttle.

So there are 3 states reported to the computer:

closed throttle
full throttle
anything in between

[Mavfan]

so i am correct in my assumption? because i need to attach a component that needs to recieve the signal from the tps to the computer. Which wire sends the mesurment of closed, wot or in between? white or white with black stripe?
_________________
Black 1988 924S SE
Red 1985.5 944

http://mavfan72.tripod.com/
http://www.cardomain.com/id/mavfan

Video:
http://video.google.com/videoplay?docid=-5193982457901018136

[Paul]

It's raining out so I don't want to go look at which color does what.

The brown wire (the center pole on the 3 pole connector goes to ground).

One of the white wires signals full throttle the other closed throttle.

So this is what the computer sees.

Closed throttle. the closed throttle white wire is grounded, the full throttle wire is open (no path to ground).

In between, both white wires are open (no path to ground)

Full throttle, closed throttle wire is open, full throttle wire is grounded.

So to figure out which white wire is which, pull the connector off of the TPS and put a ohm meter between the center post of the switch and one of the posts on either side of it. Assuming the throttle is closed, the closed throttle white wire attaches to the post that is grounded (zero ohms)
_________________
White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.