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Topic: o/d light comes on (Read 2117 times) |
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leewar
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o/d light comes on
« on: Jul 17th, 2009, 8:28pm » |
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Hi All need advice. While driving on the a12, the overdrive light comes flashing on on the dashboard and top gear is lost. Stopped car to reset and carried on but that only is a temporary fix. What is happening and what is the fix..Hope it's not bad and not expensive 
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Highlander
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Re: o/d light comes on
« Reply #1 on: Jul 17th, 2009, 8:33pm » |
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Hello and welcome to the site 
Have a read at the following
http://www.fordscorpio.co.uk/odlight.htm
Which engine is it you have?
Does your speedometer work properly?
Check the gearbox oil level and condition using the correct procedure :
http://www.fordscorpio.co.uk/autogearbox.htm
A gearbox oil and filter change has been known to solve this 
Clean the MAF
http://www.fordscorpio.co.uk/cleanmaf.htm
On OBD scan would be very helpful, where are you located? someone may be able to do one for you.
Possibly a wiring loom issue but check the above first before we look at that.
Of course it may just be that your gearbox has had enough, it will be at least 11 years old after all
Worst scenario = another gearbox/loom
A new gearbox is probably not viable now but second hand ones can still be picked up fairly cheaply if you can get someone to fit it
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on Oct 17th, 2011, 12:35pm, Simmo wrote:I give up !  Too much for an old boy!  |
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wojtekor
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95% chance that it's the gearbox wiring loom...
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Highlander
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Re: o/d light comes on
« Reply #3 on: Jul 17th, 2009, 8:41pm » |
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on Jul 17th, 2009, 8:39pm, wojtekor wrote:| 95% chance that it's the gearbox wiring loom... |
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100% chance thats a guess! 
Not the fuseboxes this time??
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on Oct 17th, 2011, 12:35pm, Simmo wrote:| I give up ! Too much for an old boy! |
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leewar
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Re: o/d light comes on
« Reply #4 on: Jul 17th, 2009, 9:00pm » |
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Hi Should have given you more info before starting. It.s a 1995 2.0 Ultima, has new and clean MAF, speedo sometimes erratic and not showing correct speed, oil level OK but not bright red, more a murky light brown with no rancid smell.
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leewar
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Re: o/d light comes on
« Reply #5 on: Jul 17th, 2009, 9:01pm » |
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I am in not so sunny at the moment Clacton
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tlundkvi
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Ex. Scorpio 2.9 24V -95
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Re: o/d light comes on
« Reply #6 on: Jul 17th, 2009, 9:21pm » |
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on Jul 17th, 2009, 9:00pm, lleewar wrote:| Hi Should have given you more info before starting. It.s a 1995 2.0 Ultima, has new and clean MAF, speedo sometimes erratic and not showing correct speed, oil level OK but not bright red, more a murky light brown with no rancid smell. |
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If there is a problem with the speedo showing erratic readings, it's likely it's only the VSS that is broken or it's drive pinion is worn (separate finis). I have a bad VSS, and o/d flashes every now and then, and gearbox smoothness is lost. I have a 24V & A4LDE though which is more dependent on the VSS, but anyway I'd check that out. It's one of the easiest things you can fix & replace on a scorpio. Is the VSS problem you have simultaneous with loss of 4th?
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wojtekor
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on Jul 17th, 2009, 8:41pm, Highlander wrote:
100% chance thats a guess!
Not the fuseboxes this time?? |
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not a guess, statistically supported theory
i'm keeping the fuseboxes for later.
although if you're saying that the speedo missreads then tlundkvi's theory is most likely right...
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Highlander
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Re: o/d light comes on
« Reply #8 on: Jul 17th, 2009, 10:09pm » |
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Yep, sounds like it may be the VSS
lleewar the speed sensor not only provides the speedo reading but is used to control the auto gearbox such as gearchanges etc.
Its a simple replacement, one bolt and a multiplug connector.
you can reach it from under the car
or if it raining you can get to it from above
This is the view with the gear selector removed, VSS is directly below.
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on Oct 17th, 2011, 12:35pm, Simmo wrote:| I give up ! Too much for an old boy! |
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leewar
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Re: o/d light comes on
« Reply #9 on: Jul 17th, 2009, 10:13pm » |
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Have lost 4th a few times while on motorways and revs have leapt. Have to let foot off the pedal for it to engage( possibly third) and when it does and u put the foot down again, it races up the revs again begging to change.
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tlundkvi
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Re: o/d light comes on
« Reply #10 on: Jul 18th, 2009, 5:48am » |
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on Jul 17th, 2009, 10:13pm, lleewar wrote:| Have lost 4th a few times while on motorways and revs have leapt. Have to let foot off the pedal for it to engage( possibly third) and when it does and u put the foot down again, it races up the revs again begging to change. |
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Is the speedo erratic only in high speed?
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leewar
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Re: o/d light comes on
« Reply #11 on: Jul 18th, 2009, 3:29pm » |
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Sorry for late reply. It is errastic mostly in the higher speeds.When slowing down to say a roundabout and pulling away again the speedo continues not to register the right speed. Also noticed that the cruise control does not work properly. Sometimes it will set ok and cruise ok but while in cruise the speed gets erratic and the revs move up and down, feels like its misfiring or missing.
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Highlander
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Re: o/d light comes on
« Reply #12 on: Jul 18th, 2009, 6:42pm » |
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VSS definitely then
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on Oct 17th, 2011, 12:35pm, Simmo wrote:| I give up ! Too much for an old boy! |
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leewar
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Re: o/d light comes on
« Reply #13 on: Jul 19th, 2009, 12:46am » |
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Thanks everyone for the advice. Will purchase a new vss and will post the results. This site and forum is a great source of info and I will definitely call on the experts again if i get any more problems
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tlundkvi
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Re: o/d light comes on
« Reply #14 on: Jul 19th, 2009, 7:20am » |
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on Jul 19th, 2009, 12:46am, lleewar wrote:| Thanks everyone for the advice. Will purchase a new vss and will post the results. This site and forum is a great source of info and I will definitely call on the experts again if i get any more problems |
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It's quite expensive though around £100 for all three parts (VSS+Pininon+clip), so it may be worth looking for a 2nd hand part. And the pinion should be from the same model, but that one is much less if you need to get a new one.
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leewar
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Re: o/d light comes on
« Reply #15 on: Jul 25th, 2009, 2:56pm » |
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Have purchased a secondhand vss and put it in. Checked with ford that it was the right one and they told me it was used in a number of fords, seirra, transit etc. Body of it is different to my one . Does this make any difference? Thanks for the pics Highlander. Now the cruise control seems to work but the speedo seems to show about 10 miles over actual speed and unusually gear changes and kickdown are much better.
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tlundkvi
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Re: o/d light comes on
« Reply #16 on: Jul 25th, 2009, 4:26pm » |
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on Jul 25th, 2009, 2:56pm, lleewar wrote:| Have purchased a secondhand vss and put it in. Checked with ford that it was the right one and they told me it was used in a number of fords, seirra, transit etc. Body of it is different to my one . Does this make any difference? Thanks for the pics Highlander. Now the cruise control seems to work but the speedo seems to show about 10 miles over actual speed and unusually gear changes and kickdown are much better. |
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Appearance doesn't make any difference. The first scorpios used a metallic housing type, and the newer ones use one with a plastic housing. Both are interchangable.
You have got the wrong number of teeth in the driver pinion of your VSS (detachable separately). You need to get the pinion from the exact same model. Yours has too few teeth (resulting in too many revolutions per distance driven => higher speed than actual), which indicates you got the replacement from a 24V, if the donor was a scorpio.
If the other problems went away, your VSS was definitely broken somehow.
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Highlander
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Re: o/d light comes on
« Reply #17 on: Jul 26th, 2009, 9:29pm » |
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Hmmm I think he has the correct one.
Is your actual speed from the sat nav?
The Scorpio speedo should show roughly 10% over actual speed (Ford designed them that way)
on Jul 25th, 2009, 2:56pm, lleewar wrote:| and unusually gear changes and kickdown are much better. |
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Thats not a bad thing
So after worrying about it being a new gearbox you fixed it yourself for a few quid
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on Oct 17th, 2011, 12:35pm, Simmo wrote:| I give up ! Too much for an old boy! |
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leewar
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Re: o/d light comes on
« Reply #18 on: Jul 27th, 2009, 4:55pm » |
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Hi There . Have removed the secondhand vss to check the number of teeth. The pinion supplied had 19 teeth and my original, yes original after 145000 miles, has 21 teeth so I swapped them over. Will relay the results back to you after a couple of long runs.
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Highlander
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Re: o/d light comes on
« Reply #19 on: Jul 27th, 2009, 6:54pm » |
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The 21 teeth is correct for the 2.0 16v
your 19 teeth one is for a 2.3
was your "actual speed" reading from the satnav??
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on Oct 17th, 2011, 12:35pm, Simmo wrote:| I give up ! Too much for an old boy! |
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