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 Post subject: Mk 2 Mondeo
PostPosted: Tue Jan 08, 2008 18:25 
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Anyone know where the speed sensor is on this particular vehicle?

Blessed thing keeps dropping the speed signal causing the speedo to drop to zero* only for it to come alive again a minute or so later accompanied by a flash of the low fuel warning lamp. Known problem on this make and model apparently.

*A couple of times it has actually increased steadily up to maximum, really disconcerting as your're easing off the gas on the curve of a motorway slip to see the speedo rising gradually through 110 mph :shock:

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PostPosted: Tue Jan 08, 2008 18:36 
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Gearbox perhaps? Might be a faulty sender unit or a dodgy connection. Try honestjohn.co.uk in the backroom as they have few mechanics on there who might know for certain.

If other dashboard thingies are flashing or being odd then it points to a bad earth in the wiring to the dash or something wrong with the dash display itself. Anyone would think it was italian :wink:


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PostPosted: Tue Jan 08, 2008 18:41 
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I've tried the earths TB. It is a known fault apparently and can be rectified by giving the speed sensor connector a squirt of WD40. If you can find it!

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PostPosted: Tue Jan 08, 2008 19:05 
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Its almost certainly going to be on the output side of the gearbox.


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PostPosted: Tue Jan 08, 2008 20:21 
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The problem doesn't lie with the sensor, it lies with the instrument cluster itself.

http://www.fordmondeo.org/forum/showtop ... tid/717053

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PostPosted: Tue Jan 08, 2008 23:28 
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surely vehicle speed will be from ABS ?... which i'd expect it to have.

it does sound like an electrical problem with the intrument cluster, or connectors or loom to it.


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PostPosted: Tue Jan 08, 2008 23:48 
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I hope you are niftey with a soldering iron 8-)

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PostPosted: Wed Jan 09, 2008 01:09 
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ed_m wrote:
surely vehicle speed will be from ABS ?...

Erm....all the ABS sensors (all 4 of them) do is tell the braking system whether the wheel in question has locked up or not.

The sender unit for the speedo is located on the gearbox, although that is not the fault that occurs.



@ Rigpig,

You do have to be reasonably good with a soldering iron (as well as working with SMD's). I would also recommend a temperature controlled iron with a pencil tip.
Do NOT leave the iron on the job for too long as it is very easy to damage the printed circuit.


I'm based in Farnborough (Hants) and i've repaired more than a few of these clusters if you don't fancy tackling the job.

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PostPosted: Wed Jan 09, 2008 11:27 
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Gixxer wrote:
ed_m wrote:
surely vehicle speed will be from ABS ?...

Erm....all the ABS sensors (all 4 of them) do is tell the braking system whether the wheel in question has locked up or not.

The sender unit for the speedo is located on the gearbox, although that is not the fault that occurs.


ABS sensors.. all 4 of them ?... would be SPEED sensors... and it is now common for the ABS to communicate this vehicle speed to the dash.

but i'll bow to your knowledge on this specific vehicle.


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PostPosted: Wed Jan 09, 2008 21:44 
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ed_m wrote:
ABS sensors.. all 4 of them ?... would be SPEED sensors... and it is now common for the ABS to communicate this vehicle speed to the dash.

but i'll bow to your knowledge on this specific vehicle.


It varies by vehicle. Having a speed sensor on the transmission is a legacy from the mechanical speedo days. New vehicles take the speed from the ABS ECU which in turn takes it from the wheel sensors. Most vehicle ECUs use vehicle speed for some reason or other (inhibit functions etc). Often the instrument cluster is used as a gateway to distribute vehicle system data to other systems.

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PostPosted: Wed Jan 09, 2008 23:02 
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Gixxer wrote:
@ Rigpig,

You do have to be reasonably good with a soldering iron (as well as working with SMD's). I would also recommend a temperature controlled iron with a pencil tip.
Do NOT leave the iron on the job for too long as it is very easy to damage the printed circuit.


I'm based in Farnborough (Hants) and i've repaired more than a few of these clusters if you don't fancy tackling the job.


Yeah, I'm getting the feeling this is the sort of job that would be beyond my limited skills with a soldering iron. As a 'heavy' by trade I'm probably a bit too hamfisted!
How long does this job take to do?


BTW, my car doesn't have ABS.

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PostPosted: Wed Jan 09, 2008 23:27 
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Rigpig wrote:
How long does this job take to do?

About an hour

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 Post subject: Re: Mk 2 Mondeo
PostPosted: Mon Apr 28, 2008 18:02 
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Well, I've resurrected the thread because the damned thing has just about failed completely. The fault is exactly as described on P3 of this document (which describes a repair) and is as pointed out by Gixxer earlier on, a fault with the instrument panel and not the sensor. I.e. the speedo has been working Ok during the cool winter months, but is now dropping to zero as the cabin warms up in the milder weather.
Because of the age of the car, its low value and the costs involved in getting the old one repaired (and notwithstanding Gixxers offer) I've managed to source a replacement instrument cluster for £15, at least they assure me over the phone its the complete cluster 8-) and I'm going to replace it over the bank holiday.

Now to the point... :P

Obviously the new panel will have a different mileage on it to the original, so does anyone know what I have to do about this in the legal sense? The DVLA website offers no info at all, well none that I could find anyway and google searching reveals a Wikipedia reference to the procedure in the USA but nowt about the UK.

Anyone?

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 Post subject: Re: Mk 2 Mondeo
PostPosted: Mon Apr 28, 2008 18:26 
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If you need someone to check it over before you install it Rigpig - enter Tone :D

If flies were made of copper I could solder their legs together.

Not what you have asked here, I know, (Bit late reading this thread). But you don't want to put the replacement back in and have the same problem again further down the line, if not straight away :hoppingmad:

So if any of the known problems can be checked or sorted before you install it, well, prevention is better...

If you're not too far away I'm happy to pop down, up, across to check it.

Tone (A man of whom someone once said "who?")

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 Post subject: Re:
PostPosted: Mon Apr 28, 2008 18:33 
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Rigpig wrote:
As a 'heavy' by trade I'm probably a bit too hamfisted!


I've got this image of your hands looking like two pound of pork sausage :) Are you the Hulk? :hehe:

BTW. I'm in Da Midlunds lyke ya no ;)

:D

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 Post subject: Re: Re:
PostPosted: Mon Apr 28, 2008 18:38 
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Big Tone wrote:
Rigpig wrote:
As a 'heavy' by trade I'm probably a bit too hamfisted!


I've got this image of your hands looking like two pound of pork sausage :) Are you the Hulk? :hehe:


May as well be :P
I just can't do fine soldering work, never have been able to although I suppose with more practice I could manage it.
It seems as though an inductor on the PCB needs bridging to solve the problem. I took the printed PDF file down to a local vehical electrical specialist and they said they couldn't do it because it was 'electronics mate'.
I resisted to ask them what the heck they actually did do then because I may need them in future :P

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 Post subject: Re: Mk 2 Mondeo
PostPosted: Mon Apr 28, 2008 19:35 
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Riggers,

If you don't have a Haynes Manual I came across this site for future use :)

Haynes Ford Mondeo Service Manual

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 Post subject: Re: Mk 2 Mondeo
PostPosted: Mon Apr 28, 2008 19:52 
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Cheers Dixie, I do have a Haynes manual although I've not always found them to be wholly useful.

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 Post subject: Re: Mk 2 Mondeo
PostPosted: Mon Apr 28, 2008 19:56 
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Rigpig wrote:
Well, I've resurrected the thread because the damned thing has just about failed completely. The fault is exactly as described on P3 of this document (which describes a repair) and is as pointed out by Gixxer earlier on, a fault with the instrument panel and not the sensor. I.e. the speedo has been working Ok during the cool winter months, but is now dropping to zero as the cabin warms up in the milder weather.
Because of the age of the car, its low value and the costs involved in getting the old one repaired (and notwithstanding Gixxers offer) I've managed to source a replacement instrument cluster for £15, at least they assure me over the phone its the complete cluster 8-) and I'm going to replace it over the bank holiday.

Now to the point... :P

Obviously the new panel will have a different mileage on it to the original, so does anyone know what I have to do about this in the legal sense? The DVLA website offers no info at all, well none that I could find anyway and google searching reveals a Wikipedia reference to the procedure in the USA but nowt about the UK.

Anyone?


I didn't think it mattered, as long as you don't attempt to mislead a buyer. You can have it "corrected" by one of those backstreet garages, and as such, what it reads is irrelevant without a FSH. (Which itself can also be bought quite cheaply, apparently.)

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 Post subject: Re: Mk 2 Mondeo
PostPosted: Mon Apr 28, 2008 23:20 
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Rigpig wrote:
Cheers Dixie, I do have a Haynes manual although I've not always found them to be wholly useful.


Their boast, as I recall, was that they completely disassemble and re-assemble everything they publish

They should do one for women IMO :D

(Oh sh1t, what have I said :roll: )

Yeah okay, they should do one for men too, although it would come down to let them have the TV remote and watch footie while drinking a pint and don't complain when they fart.

Now you're wondering who's side I'm on eh? :hehe:

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The views expressed in this post are personal opinions and do not necessarily represent the views of Safe Speed.
You will be branded a threat to society by going over a speed limit where it is safe to do so, and suffer the consequences of your actions in a way criminals do not, more so than someone who is a real threat to our society.


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