Speed sensor

[Marshman]

Can anybody advise me where the electrical speed sensor is on the gearbox on a 1993 3.0TD Auto? I though I knew where it was but not sure now, picture would be great.

Also should the speed sensor look like this when removed?

[Macca81]

you appear to have circled it in your first pic...

[NiftyNev]

you appear to have circled it in your first pic...

Agreed. That's it.

Nev

[Marshman]

Thanks for the confirmation guys.

THe bit that confused me was that there are 3 wires coming from it and I was told there was 2 wires only. I guess I just need to take is out and have a look, unless somebody has a wiring diagram they could send me please?

I have bought a speed sensor, but it looks nothing like the picture and looks more like a black piece of plastic on the inside with no cogs?

Is this the wrong bit?

[NiftyNev]

Post ypur Model and Frame number and i will give you the proper part number.

Nev

[Marshman]

Thanks Nev,

Model number Y-KZN130W-GKPQT, Frame number KZN130-9012476.

Do you know if the sensor should look like the second picture, as the one I have just got doesn't and seems to be a long blank tube (sealed) and I was told it was further up the gearbox where the gear selector come out the bottom of the car.

Do you have a wire diagram for it to check the cable colours?

Help much appreciated, as I m pulling whats left of my hair out.

Martin,

[NiftyNev]

83181-12020 is the part number. This is all I have regarding a diagram.

Nev

[Marshman]

Thanks Nev,

Does anybody know if I can test the speedo and the speed sensor before I buy a new one to test one which is broken, Cables look ok.

If I can, I don't want to buy both and find out it is something else is faulty?

I have read one thread regarding servicing the speedo, what grease do I need to use when cleaning it and putting it back in?

[NiftyNev]

Never done it myself but I believe the sensor can be tested by spinning rapidly for a short period and check for voltage. You have to have a mulimeter set to AC though, I think.

Nev

[Marshman]

Ok, the situation so far is that I have worked out that the 3 wires in to the speed sensor are as follows:-

black/orange - 12v power
blue - .05 v - ECU
green/red - .00 v - speedo.

Does anybody know if I can test out the connections by seeing what voltage comes out of the blue and, the green and red cable. I have been told that there should be a pulse, but it would be to quick to catch on a meter, is this true?

And can I use 12 volts for the test, as I was told originally it would only be 5 volts?

I would like to test out before buying a new speedo.

When I complete this I will post how this can be tested for future issues.