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Topic: Tacho (Read 429 times) |
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DaveN
Newbie
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Hi Folks, anyone know how the signal that drives the tacho is derived on a 2.9 12V? mine is dead and the pulses reading shown in the instrument diagnostics is 0?
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Eric_R
Administrator
Cosworth Owner 1998 - 2006 & site co-founder
Posts: 1792
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Re: Tacho
« Reply #1 on: Feb 22nd, 2006, 9:02pm » |
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Dave,
The speedo is driven by the Vehicle Speed Sensor, (VSS) mounted on the side of the autobox. It is simple to change, see
http://www.fordscorpio.co.uk/manual/electrical/intbasic/VSS.pdf
Your A4LDe gearbox is less sensitive to the loss of the VSS input, but you may have noticed that the engine isn't changing up properly into 4th and the torque converter lockup may not be working. This will correct itself as soon as the EECIV gets the correct VSS input.
HTH
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DaveN
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Re: Tacho
« Reply #2 on: Feb 23rd, 2006, 1:47pm » |
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Thanks for the info, I thought perhaps it wasn't the VSS as the car runs smoothly with no gearbox problems that I know of and the speedo works fine. The tacho refuses to budge from 0 but the needle kicks when reset, should't I get some reading from the pulses readout in the diagnostics - any more thoughts would be appreciated..
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Snoopy
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Very old.BAD tempered and missing friends.
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Re: Tacho
« Reply #3 on: Feb 23rd, 2006, 3:48pm » |
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AKAIK the tacho on the 12v is pulse driven from the coil
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DaveN
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Re: Tacho
« Reply #4 on: Feb 23rd, 2006, 7:09pm » |
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Cheers for that, maybe it's a bad connection somewhere in between then as the engine runs ok. Does it comes via the ECU rather than straight off the coil?
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DaveN
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Re: Tacho
« Reply #6 on: Feb 24th, 2006, 1:23pm » |
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Thanks for the link, I've printed off the schematic (all 12 pages) - just need to put my thinking head on... next question "where did I leave it?" -
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david_molloy
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Re: Tacho
« Reply #7 on: Feb 24th, 2006, 7:55pm » |
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Don't want to state obvious - but have a similar problem myself with abused Scorp which I bought for spares.
Rev counter doesn't budge on 1st start up - even "blipping" throttle has no effect - appears stuck.
In my case easily solved by banging fist on top of dash above rev counter.
Once read about someone else doing same - carn't remember where - as I commented that just like old TV fix 30 yrs ago.
If it doesn't work - bang it - does actually work sometimes!!!.
Once rev counter working - fine for day & rest of start ups - sticks again overnight!!
david
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DaveN
Newbie
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Re: Tacho
« Reply #8 on: Feb 25th, 2006, 9:15am » |
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Tried Thumping it to no avail and have since realised that the cruise control also doesn't work so gave the button a bash as well..that hasn't helped either..should I hit anything else! - cheers
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david_molloy
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Re: Tacho
« Reply #9 on: Feb 25th, 2006, 11:35pm » |
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Looks like thumping not solution in your case.
Suspect that cc problem may be relevant
I haven't got cc - so no experience
Best of luck
david
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