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Old 05-05-2012, 01:20 PM   #1
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Erratic Speedometer Not Showing Speed

I have a 2000 Winnebago Journey on a Freightliner chassis.
My speedometer stops registering at various times. The Tach still operates, but not speedometer. It just starts and stops at ramdom. Not sure where to start troublsooting first.
Any ideas?
Thanks......
Bill Miller - Currently in RV Park at Point Mugu Naval Base in California.
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Old 05-05-2012, 01:37 PM   #2
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What I would do is attach wires to the two lugs on the back of the speedo and run them out where I can attach a digital meter to them. Then monitor to see if the voltage disappears or not when the speedo stops registering. If it doesn't, the meter itself is bad. If it does, then the problem is the module or the wiring back to the module.
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Old 05-05-2012, 10:57 PM   #3
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The instruments in your Freightliner are not like instruments in an auto.

Each instrument is connected to a common data bus, and selects the data it needs from the bus. You can actually unplug the tach and speedometer, swap the connectors, replug, and they should still work.

Go to http://ww2.justanswer.com/uploads/go...44_sbu5412.pdf

and download Freightliner Service Bulletin 54-12. It has a section on troubleshooting the instruments. After following the steps in SB 54-12, if you still have trouble, call the Freightliner Help Desk at 1 800 385-4357. Have your VIN number available when you call. They've been very helpful to me.

FYI...I've seen my speedo coast down from 65 to zero while the VMSpc display still showed 65 coming from the data bus. At the next stop, it started working again and no more failures.

From your description, I suspect a dirty connector so swapping the cable between the tach and the speedo might be a good first step.

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Old 05-06-2012, 01:43 AM   #4
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Hi there just posting to this thread to track the link. Can't get enough band width on the park wi-fi to open it , have to wait till I get home.
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Old 05-06-2012, 09:11 AM   #5
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Experienced this recently, leaving me stranded, led to eventual discovery of a loose sensor connector on the side of the transmission. Details available here:

More Kudos for Freightliner tech support!!
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Old 05-06-2012, 04:55 PM   #6
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Make it easy on yourself. Download an app called 'Speedhud' for the iphone and probably droid. Far more accurate than any speedo ever made. Speedometers, after this, are completely obsolete.
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Old 05-06-2012, 05:05 PM   #7
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In fact...smart manufacturers would eliminate expensive factory installed speedos and either reduce the price of the coach (yeah right) or boost their bottom line. I have everything they can do and more for 99 cents.
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Old 05-06-2012, 06:07 PM   #8
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I use my Garmin 765 for speed info.

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Old 05-06-2012, 06:22 PM   #9
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Tom Tom is the most accurate in the business.PLUG IT IN AND FORGET THE DASH SPEED
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