85fortheDrive

At the suggestion of Chris (Landseer) I looked at the speedometer sensor that plugs into the transaxle. Speedo has been iffy for some time.

Well, I think the picture below shows why. The sensor receptacle looks pretty shot. The wiring that terminates in bulbous plugs was all but snapped off at the plug. The whole rig kinda came apart when I touched it.

The metal shaft to the left in the picture fell out of the transaxle when I unscrewed the sensor receptacle. It is a pressure tab of some sort.

I'm looking for suggestions for replacement/repair. BTW, is the ODO affected by this as well?

Thanks,
Tim

ROG100

OK - I am going to post the stupid question.
That does not look like the speed sensor to me. I thought the speed sensor was on the rear of the diff.
Maybe I am wrong. Speed Sensor is 928 606 210 00 up to 84 and 928 606 210 01 after.

85fortheDrive

Roger:

Here is Chris's message to me on this topic, which got me to take a look at this...
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There are two sets of wires attached to the transaxle.

The backup light switch is on the very back of the case, slightly to the passenger side. The pass into the case under some sort of cap held by a spring wire. I haven't needed to mess with this yet.

The pulse sensor for measuring speed is located on the very front of the case, up high, on the driver's side. It has an L-shaped boot that can be pulled away a bit. It covers a sensor. The sensor itself has a white plastic end, and is apparently brittle where the wires plug-in , so handle the whole thing it carefully.

A blue wire and a brown wire each have a cylindrical metal end soldered on. Those cylinders simply press into the sensor. I pulled them out one at a time after the boot was pulled back.

Mine were visibly frayed, the blue one hanging by a strand.

The shroud that covers the wires is stiff anywhere it was exposed to the elements, and so it makes handling the wires more difficult. If I'd had some suitable heat shrouding, I'd have cut it off in the hatch area and replaced both wires with new. I left the little metal clips off that attach the wire to the transaxle case, but wire-tied part of it up to keep it from hitting the drivers side axle.
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The part I've removed meets all these descriptions. The part number on it is 914.613.541.02 (destroyed past this point).

Larry928GTS

That's backwards. The one at the front of the case is the backup light switch. The one on the very back of the differential, that's held on by the spring wire is the speedometer sensor. The one in your picture above is the backup light switch.

That sensor on the back of the differential sends the pulses that operate both the speedometer and odometer.

85fortheDrive

This turns out to be true. The part number checks out as the reverse light switch. So I'd better get back under the differential and take a look for the speedo sensor.

Thanks for the correction, Larry

ROG100

914 613 541 02 is the back up light switch

Landseer

Big mistake on my part. Sorry to all. Example of wannabe backyard mechanic stating too factually something in a first-time encounter. Thought I had it right. Thanks for the correction!
Sorry.

Hilton

Sheesh.. I just spent 10 minutes looking through PET for the speedo pulse sensor.

For the benefit of other searchers, its in the Instrument Cluster page of PET, in the electrical equipment section

I found this thread by checking the part number for what I suspected was it - I need to buy one, as one of mine is in tatters!

jpitman2

Loss of speedo function is most ofetn a bad connection in the wiring in the spare wheel well...at a 2 or 3 pin connector. And yes the odo fails at the same time.
jp 83 Euro S AT 53k