Safe Speed Forums

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

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Political Correctness is a doctrine, fostered by a delusional, illogical, liberal minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end.

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

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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Political Correctness is a doctrine, fostered by a delusional, illogical, liberal minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end.

Its almost certainly going to be on the output side of the gearbox.

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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What makes you think I'm drunk officer, have I got a fat bird with me?

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.

I hope you are niftey with a soldering iron

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Speed limit sign radio interview. TV Snap Unhappy
“It has never been the rule in this country – I hope it never will be - that suspected criminal offences must automatically be the subject of prosecution” He added that there should be a prosecution: “wherever it appears that the offence or the circumstances of its commission is or are of such a character that a prosecution in respect thereof is required in the public interest”
This approach has been endorsed by Attorney General ever since 1951. CPS Code

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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What makes you think I'm drunk officer, have I got a fat bird with me?

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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Speed camera policy Kills

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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Political Correctness is a doctrine, fostered by a delusional, illogical, liberal minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end.

About an hour

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What makes you think I'm drunk officer, have I got a fat bird with me?

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 and I'm going to replace it over the bank holiday.

Now to the point...

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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Political Correctness is a doctrine, fostered by a delusional, illogical, liberal minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end.

If you need someone to check it over before you install it Rigpig - enter Tone

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

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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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.

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

BTW. I'm in Da Midlunds lyke ya no

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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.

May as well be
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

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Political Correctness is a doctrine, fostered by a delusional, illogical, liberal minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end.

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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Useless laws weaken necessary laws.

Cheers Dixie, I do have a Haynes manual although I've not always found them to be wholly useful.

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Political Correctness is a doctrine, fostered by a delusional, illogical, liberal minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end.

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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Fear is a weapon of mass distraction

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

They should do one for women IMO

(Oh sh1t, what have I said )

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?

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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.