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Author Topic: Speedo works then it dont  (Read 1075 times)

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Tony O

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Speedo works then it dont
« on: 12 July 2010, 09:59:57 »
My speedo works for about a mile then it stops where it is, sometime for a day or 2 then works again.
I've removed instrument panel & cleaned contacts still the same. Everything else is working fine. Is there another sensor/ conection somewhere?
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I_want_an_Omega

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Re: Speedo works then it dont
« Reply #1 on: 12 July 2010, 10:07:37 »
Sounds like impending ABS ECU failure. There is plenty on here about it. Do you get the ABS and TC lights come on as well?

I think that you need to be extra careful with a '96 car, IIRC there are several versions of ABS ECU and yours sits in the middle.

I'm sure that someone with more knowledge tan me will be along shortly to comment further.
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TheBoy

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Re: Speedo works then it dont
« Reply #2 on: 12 July 2010, 12:15:39 »
1996 ABS ECUs more robust than post 98 ones.

I'd begin to initially suspect the speedo itself.

However a few tests...

When its not working, what is instantaneous MPG like on fuel computer? Does the odometer/trip still increment.
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Tony O

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Re: Speedo works then it dont
« Reply #3 on: 12 July 2010, 15:01:23 »
Hav'nt looked at mpg & trip counter is stuck. Speedo stuck at 20 mph at the moment.
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Tony O

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Re: Speedo works then it dont
« Reply #4 on: 12 July 2010, 18:19:24 »
Instant consumption all over the place going up & down also reading mph/h when stationary.
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TheBoy

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Re: Speedo works then it dont
« Reply #5 on: 12 July 2010, 18:29:01 »
Hmmm, does sound like either the ABS ECU is outputting junk, or something is injecting duff voltages onto that connection.
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Tony O

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Re: Speedo works then it dont
« Reply #6 on: 12 July 2010, 19:37:43 »
Anything I can do to find out whats going on?
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TheBoy

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Re: Speedo works then it dont
« Reply #7 on: 12 July 2010, 19:41:28 »
Personally, I'd start looking at live data of engine, gearbox, abs, mid, instruments, cruise, sunroof ecus via tech2, but accept you wont have that capability...
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Tony O

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Re: Speedo works then it dont
« Reply #8 on: 12 July 2010, 19:59:16 »
Your right there. My daughters taking her car for a service soon so I'll have a word with her guy to see if he's got tech 2. Don't want to get rid of but cost permiting I can keep it. Thanks for your help I'll let you know how I get on.
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