Random speedometer problem.

Talk about the 406's electrical system, what wires do what, how to add extra functionality, etc.

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Mike84
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Random speedometer problem.

Post by Mike84 »

The speedo on my d9 is suffering with an intermittent fault. Sometimes when driving the speed clock just stops working, it drops to 0 then after a few minutes starts to read the speed as normal again.

There doesn't seem to be any pattern to when it stops, it does it at all speeds and it doesn't seem to matter how long the car has been running for.

Anyone got any ideas what could be causing this??

Thanks
Mike
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DiscoPol
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Re: Random speedometer problem.

Post by DiscoPol »

Yeah mine does this too :(

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Re: Random speedometer problem.

Post by FarmerPug »

could be a loose wire at the back, the d9s like mine are all electric speedometers so if you have any problem like that its electrics causing it, but if you want to buy a replacement speedometer unit here is the link to one im selling:
http://cgi.ebay.co.uk/ws/eBayISAPI.dll? ... 500wt_1154
Mike84
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Re: Random speedometer problem.

Post by Mike84 »

I have had a look at the clocks. I cant see anything that looks like it either shouldnt be there or looks broken.

Does anyone have any other ideas what this could be? Is it going to be that i'll have to change the clocks? If i do this how easy is it to get the mileage re-set?
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Doggy
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Re: Random speedometer problem.

Post by Doggy »

Mike84 wrote:I have had a look at the clocks. I cant see anything that looks like it either shouldnt be there or looks broken.

Does anyone have any other ideas what this could be? Is it going to be that i'll have to change the clocks? If i do this how easy is it to get the mileage re-set?
Not easy, maybe not possible? If you change the clocks you will wind up with the two mileages added together. :roll:

Difficult to know how to narrow this one down.

PP2000 can put all the gauges through a test sequence - this might show up an intermittent speedo, if it's happening regularly enough and you do the test enough times.....

Worth checking the vehicle speed sensor in the gearbox isn't loose/damaged/dodgy connections.

If you have the trip computer, you might be able to spot the loss of speed signal by continually resetting the average speed / watching the readout.
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teamster1975
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Re: Random speedometer problem.

Post by teamster1975 »

This one can be dodgy soldering on the back of the cluster or the speedo control box behind the glove box.
I'd go for the soldering first, this cured mine. Run every joint on the pcb.
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Doggy
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Re: Random speedometer problem.

Post by Doggy »

Isn't that a D8 only thing, Teamy?
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2003 HDi 2.2 6-speed Exec Estate (2012-19) (also a gem)
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teamster1975
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Re: Random speedometer problem.

Post by teamster1975 »

dogslife wrote:Isn't that a D8 only thing, Teamy?
I think it affects them all, certainly pre com2000.
Few ideas here too
1996 406 1.8LX Got a bad case of hydro lock!
1996 406 Executive 2.0 Turbo XU10J2TE No longer hangin' on in there :(
1997 Honda CB500V
2003 Volvo V40 1.8 GDi SE killed by a nutter in a beemer 5 series
2008 Mondeo 2.0 TDCi Titanium X

"Always look on the bright side of life, dedo, dedo dedodedo"
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Re: Random speedometer problem.

Post by steve_earwig »

The box behind the glovebox is, I think it's just ML5 boxes an' all, so that's 2.1td, tubby and V6 then (plus 2.2? I forget and am too lazy to look it up :oops: )

Dodgy joints can be a feature on all 406s :roll:
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Doggy
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Re: Random speedometer problem.

Post by Doggy »

HDi 110 & 136's have ML5's too.
2002 HDi 2.2 Exec Estate, (2008-12) (wonderful)
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Re: Random speedometer problem.

Post by steve_earwig »

Course they have, I was thinking D8s for some reason :oops:
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Re: Random speedometer problem.

Post by steve_earwig »

No hold on, they might have the ML5 but I don't think the chocolate control box made it into D9s (but I'm still too lazy to look :oops: )
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Mike84
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Re: Random speedometer problem.

Post by Mike84 »

thanks guys, i'll have a look over the weekend. Just one other thing i've spotted, the mileage and trip computer stop counting up when the speedo has stopped working.

Dont know if this might help identifying the problem...
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Re: Random speedometer problem.

Post by steve_earwig »

So nothing's getting any information. Possibly the transducer on the gearbox :?
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Re: Random speedometer problem.

Post by HimBigChief »

If the D9's do have the control box behind the glovebox, then this would be the first port of call to replace as the symptoms you're having are exactly the same as what I had on my 2.1TD D8, and this was the box at fault. I liberated one from a local scrappy, in fact I liberated both the ones I could find, but only one of them worked.
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