Gearbox distance speed sensor wires / pins

[Error404]

Can anyone help me out with which pin is which on the speed / distance sensor on the gearbox? I took the pins out to extend the loom for my 6speed swap and lost the piece of paper where i wrote down which went where

Its the 3 pin plug on passenger side of gearbox, IIRC there is a black/blue wire, a brown wire and a brown /red wire - anyone tell me which goes to which pin?

Cheers
Alex

[Jamo]

Hahaha yeah the VEMS guys know about this one!

The 3pin female connector has

* pin1 black-blue +12V (when ignition is on, fuse-relay panel pin B15A fuse#12) supply for HALL sensor
* pin2 brown-red pulled up by the car with 100 Ohm (strong pullup!)
* pin3 brown: GND

6 gear audi transmission sensor seems to have a simple reed-switch between pin2-3.

[Error404]

Cool, thanks dude.

Whats the connection with the hall sender all about then?

[Jamo]

Speed sensor for the VEMS unit

[Error404]

ahha

[S2central.net]

To clarify.... the speed sensor at the gearbox is a 'hall effect' device - NOT to be confused with similar technology used for detecting camshaft position in the engine.

[mcandmar]

Its actually a reed switch inside, when it passes a magnetic field the two pieces of metal join together and complete a circuit. I was quite surprised when i seen that, didnt think it would open/close quick enough to work in that application.

[S2central.net]

Are you sure about that... I know they changed a bit across the years. My memory could be wrong here, but I think I've seen at least one reference in OFRM to this being a hall effect device.

[mcandmar]

Yep, it came out of Davids car, gearbox was left hanging and ripped the plug/sensor out of its outer casing. I think its still there so i'll snap a pic next time i'm over.

[4WheelDrifter]

Both my 7A and 3B have had a reed switch in them, as Mark describes. I've had them apart.

[S2central.net]

How odd.... must dig out the manuals - hopefully its just my memory is wrong ;-)