the man with no idea wrote:
> On 22 Feb, 16:26, Pete M <pete.mur....DeleteThis@SPAMFREEblueyonder.co.uk> wrote:
>> the man with no idea wrote:
>>
>>
>>> On the A1, been in a bit of slow traffic, had just turned the cruise
>>> control back on to take me up to cruise speed and it tripped out at
>>> about 65 mph (should only do that below 25). Looked at speedo and it
>>> was reading 0. Glanced at computer and it was reading 0. Looked at rev
>>> counter and that's reading about 3.5k - higher than I expected.
>>> Clicked button to take off overdrive (4th to the rest of us) and the
>>> revs don't change - so it's not going into top.
>>
>> VSS - "Vehicle speed sensor" on the gearbox if the speedo isn't working,
>> it also tells the gearbox when to change gear, the weighting of the
>> steering and a few other things - like the overdrive.
>>
>> Common thing, not very expensive to fix.
>
> A mate of mine just put me in touch with a mechanic he knows. He
> reckons that it has to go on a computer for proper diagnostics - which
> he couldn't do. So I said that it's almost certainly the VSS, couldn't
> I just replace that. He replied in the negative because the
> replacement would still need programming in. Starting to get desperate
> I suggested that at least I could get the connector off, give it a
> clean etc and see if that makes a difference. No says he. Even with
> the battery disconnected the EMS may log a fault and refuse to run the
> car at all.
The car runs doesn't it? So he's talking out of his arse. Give it a
clean and see what happens. My Scorpio did the exact same thing, I
cleaned out the connector and gave it a bit of gentle percussion and
it's been fine since. That was 7000 miles ago.
>
> This all sounds like I'm buggered.
<quick google>
Ford Mondeo 1993 and 1997
Problem: Speeodometer display broken and/or gearshifting/4th gear not
engaging (automatic transmission only)
Solution: May be caused by a broken vehicle speeder sensor (VSS) drive
shaft or a damaged vehicle speeder sensor cable. A new vehicle speeder
sensor must be installed to resolve this concern. On manual transmission
vehicles the routing of the vehicle speeder sensor cable must also be
checked and secured if necessary using a cable tie.
Honestly, just clean it up, or replace it. It'll be fine. It might log
an error in the EMS but as soon as it finds the sensor working it'll
work fine. The error will clear itself after so many cycles.
--
Pete M - OMF#9
Range Rover V8 Turbo
Scorpio Ultima 24v
"Professional Petrolhead"
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