Speedo Issue

[Dogra 10]

Hi guys,

 

The issue is pretty simple to explain.

 

The release bearing went on my gearbox so the gearbox came off to change that along with the clutch and pressure plate. Changed all that and put the gearbox back on like normal.

 

But now the speedo is acting weird, it reads a speed like normal but then goes crazy and will jump up and down like 30mph.

 

My spoiler also went up, i didn't change speed but then the spoiler went down just like that.

 

Also in my engine bay, I've found a wire (spade) that is now just dangling there. I'll get a picture of that tomorrow as its dark now.

 

The car is a 94 VR6 if that helps.

 

Any help would be awesome,

 

Thanks in advance.

[vw rule 19]

Could be a bad connection in the plug or socket of the VSS (Vehicle speed sensor)

Or the internal spindle contact of the sensor.

 

There is a pickup contact sensor on the back of the speedo gauge,

which can play up but normally it's the VSS sensor on the gearbox.

 

The VSS sensor's can break up inside i.e the internal contacts can,

this can happen when the gearbox is unbolted from the engine and tilted at an angel,

to be able to drop the box down, this angel can be enough to finish the sensor off,

or a slight knock can do it when the box is put down on to a hard surface,

or if the sensor it's self is knocked against something.

 

Did you knock the head of the sensor when you were removing or refitting the gearbox ??

As a slight knock no matter how small can affect it's performance,

or was the wiring pulled slightly ??

 

That would be good if you can post up a photo of the wire or contact that you have lose,

it might be related to your issue ??

 

 

Hope this helps.

 

Si

[Dogra 10]

Hi Si,

 

That was really helpful. I think the VSS may be damaged after reading what you said. The gearbox did hit some hard angels trying to come out so i think that caused the problem.

 

Is it an easy fix?

 

Also this is the loose wire, any idea what it is?[ATTACH=CONFIG]76198[/ATTACH]

[vw rule 19]

Yeah the sensor just unscrews off the speedo gear fitting,

but before you unscrew it you'll have to unplug the connector plug first.

 

You can't really take apart the VSS due to it being made out of plastic,

it would just break in bits as it's normally bonded together,

so when they do wear out it's a throw away item.

 

I can't remember if the VSS is still in stock with VW dealers or if it's obsolete now,

but you'll have to find a replacement if poss.

 

I have got a list of most of the part numbers for the Corrado,

I'll have to found it if I can.

 

That (yellow/black) coloured wire you have in the photo,

that isn't anything to do with the speedo by the looks of it,

on the VR6 engine there can be a lone single wire that doesn't really go to anything,

this wire is normally below the slam panel area, I think.

But seeing where it is, just have a good look around the front of the engine,

because the oil pressure switch wire can some times work lose which is a single wire as well,

on some of the VR6 engines.

 

There are a few guys on this forum who are breaking Corrado's,

so you might be able to obtain one from one of them,

but you'll have to be quick though as some guys and girls on here are very fast at grabing these items.

 

Your best bet if you can is to have a selection of spare parts new and secondhand,

like various switches, clips, trim, lights and so on,

this way you'll be able to fix the problem right there and then.

 

This VSS can show it's face on EBAY some times, but they are quite rare to found,

plus have a word with VW Heritage they might have one,

plus try your local VW Dealer just in case,

the amount of times I been told, "no sorry Sir we don't have that on the shelf,

let me just check our central warehouse", and bingo they can some times have an obsolete item there,

again it's rare but worth a try.

 

 

Hope this helps.

 

Si

[dalhalvaig 0]

Hi

 

I've had exactly the problem you describe back in 2011. I changed the sensor and that seemed to cure the problem but it happened again last year I think. I got the VSS from a dealer it cost £26. I think that it is a part common with other VAG. In the end I found that the problem was in the connector for the VSS. A new connector had been fitted and bullet connectors fitted to the wring loom and jammed into the connector. they were coming loose and causing the dodgy signal and speedo and spoiler activity you describe. Before parting with 26 beer tokens I'd give the connectors a check.

 

D

[vw rule 19]

I think the part number for the VSS is (191 919 149D) I think that is correct.

Just in case you need it.

 

Si

[Dogra 10]

Thanks guys, you've both been great help.

 

When it get light outside again I'll have a look at the connection.