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speedometer error (the other type)


Missouri Bob

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Missouri Bob

The other day, I experienced a situation where the ST's speedo indicated a speed LOWER (by almost 20%) than my actual speed. I stopped, and re-booted, and everything returned to normal. Has anyone else seen this?

 

Bob

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  • 1 year later...
Missouri Bob

It happened again, twice. When I first noticed the mis-reading, the speedometer was showing about 40 mph when I was actually doing 60-70 mph. I didn't stop and reboot. Over the next few minutes, the speedometer's reading continued to decrease even though my actual speed did not. At an indicated 10 mph, I decided that I had seen enough, stopped the bike, and re-booted. Everything back to normal.

 

Several hundred miles later, it started again. This time, I momentarily shut off the ignition (while still moving). The speedometer came back, partially. It still showed a reduced speed, although not as bad as before the ignition shut-down. I repeated the shut-down two more times; gaining speedo accuracy each time.

 

I would like to get this addressed before the warranty expires. Anyone else seen this?

 

Bob

 

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Jim VonBaden

Yes, and in the cases I am familiar with, the speed sensor had excessive metal particles on them from a possibly failing final drive.

 

Jim :Cool:

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Missouri Bob

Interesting.

 

As it so happens, I changed the final drive just after returning from the latest trip (when the speedo error was seen). There was a very small amount of metal on the sensor. Just to get more data, I collected the final drive oil in a jar, and left a magnet in the jar to collect anything additional. Nothing.

 

Don't scare me with that f/d failure stuff! FWIW, mine has 21K on it.

 

Bob

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Yes, and in the cases I am familiar with, the speed sensor had excessive metal particles on them from a possibly failing final drive.

 

Jim :Cool:

 

That would be my guess to.

 

I had a Harley do the same thing, removed the sensor (it's on the tranny on an HD) cleaned the shavings off of it, and solved the problem...

 

 

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A single faulty speed sensor seems suspicious to me if your ST has ABS installed. The ABS system should have set a code and indicated "brake failure" on the dash if only one sensor's output were questionable.

 

I don't think you can compare the H-D with the BMW since the H-D does not have ABS.

 

I may be wrong, but it seems to me the problem resides elsewhere.

 

My $0.05 (adjusted for inflation) :-)

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Missouri Bob

That's a good point. Particularly since failing f/ds are so common :), I would have expected more riders to have experienced the changing speedometer syndrome. The cynic in me says that all will be revealed after the warranty expires.

 

Bob

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Missouri Bob

More data: It started again today after about 30 miles on the highway. Since I cleaned the speed sensor within the last 100 miles, I doubt that it has accumulated any debris.

 

This appears to be getting worse, and if I am fortunate, will be something I can show the dealer while the ST is still under warranty.

 

Bob

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The same thing happened to my 05 ST when it was still low miles.

The dealer couldn't find anything but asked if it was "sticking"

Once I said the magic words, they replaced the instrument cluster and it went away for good (20,000 miles ago). They had a little trouble with the version of the instrument vs. the software. The new info screen looks a little different but it is better in sunlight and has worked ever since.

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