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Ford Mondeo 2.0 TDCi - No speedo or odometer - Fixed #

Posted by Liam Hall on March 13, 2011, 10:14 am

Year of Manufacture *: 2002 '52
( Optional ) Engine Code or CC: 1995CC

Car came in with no speedo or odometer on the display.
Would lose the speedo and odometer randomly every few start cycles.

Scanned, no codes present.

The car started no problem etc.

I remembered reading somewhere that a new battery could cure this speedo sensor fault.

Fitted a new battery, and fault gone.

So no problem there. BUT, I am trying to improve my understanding, and at the moment, the customer is over the moon etc, i'm not completely confident in why the fault has gone after such a simple operation.

I feel like I have fixed it but dont know why!

Can anyone offer some explanation?

Liam.

Re: FORD MONDEO 2LITRE TDCi

Posted by Kevin Apps <iframe src='https://members4.boardhost.com/ukautotalk/info/user=UKAT2589' width='330' height='300' border=0 style='border:none;'> on March 13, 2011, 1:45 pm, in reply to "FORD MONDEO 2LITRE TDCi"
Kevin Apps

Liam.
"Battery voltage dips below the 10.5v limit at the TCM during the engine crank, and because of the way the software in the module works it then fails to pickup the VSS signal from the transmission." hence no speedo.
This is the explaination of some-one in the know at Ford.
Kev.

Re: FORD MONDEO 2LITRE TDCi

Posted by andyhyoung <iframe src='https://members4.boardhost.com/ukautotalk/info/user=UKAT5148' width='330' height='300' border=0 style='border:none;'> on March 13, 2011, 9:18 pm, in reply to "FORD MONDEO 2LITRE TDCi"
Andrew Young

Interestingly I had same fault on a similar car last week.Customers only complaint was the odometer/trip display went to dashes after start up.Also something else I noticed was that it was not possible to toggle the left display from degrees F to Celcius.A new battery fixed it.A test on the battery with an old fashioned "stabber" showed it to be a little under par,however when I used my Snap-on digi tester it failed the battery on the conductance test.I don't think this is a voltage issue.I have jump started loads with flat batteries and they all don't show this characteristic.I beleive the fault is more to do with the battery acting as a capacitor and smoothing out any ripples from charging circuit.Stand to be corrected!!

Re: FORD MONDEO 2LITRE TDCi

Posted by Steve Nicholas <iframe src='https://members4.boardhost.com/ukautotalk/info/user=UKAT5547' width='330' height='300' border=0 style='border:none;'> on March 13, 2011, 11:19 pm, in reply to "Re: FORD MONDEO 2LITRE TDCi"
Stephen Nicholas

It would be interesting to monitor voltage and ripple before and after with a scope if anyone has one of these incidents in the future.

Regards,

Steve

Re: FORD MONDEO 2LITRE TDCi

Posted by Kevin Apps <iframe src='https://members4.boardhost.com/ukautotalk/info/user=UKAT2589' width='330' height='300' border=0 style='border:none;'> on March 14, 2011, 1:39 am, in reply to "Re: FORD MONDEO 2LITRE TDCi"
Kevin Apps

Andy
The source is impeccable.
Kev.

Re: FORD MONDEO 2LITRE TDCi

Posted by Liam Hall <iframe src='https://members4.boardhost.com/ukautotalk/info/user=ukat3033' width='330' height='300' border=0 style='border:none;'> on March 14, 2011, 7:08 pm, in reply to "Re: FORD MONDEO 2LITRE TDCi"
Liam Hall

Thanks for your replies.
I actually was thinking along the lines of battery dipping below a required voltage for the ECU.
I was chuffed to have sussed it, but thought i would ask, just to improve my knowledge.

Again, thanks for everyones' input, very much appreciated.

Liam.

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