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Old 10-04-2022, 05:15 PM   #1
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Speedometer doesnít work with wet roads

I have a 2001 Dutch Star 4095 on the Mountain Master chassis. Speedometer works great until the road gets wet Then it will go to 0 and sometimes get the information light. Hit a bump or cross over a bridge and it works again for a bit. Question is where does the speed information come from, the transmission speed sensors or the ABS system. I believe it is a bad connection that gets wet. Any ideas or suggestions would be appreciated. Thanks for any suggestions


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Old 10-04-2022, 05:20 PM   #2
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Look around the final drive on the tranny.
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Old 10-04-2022, 05:25 PM   #3
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Not familar with that chassis,, Speedo signals Normally cone from Rear Axle or The Transmission tail shaft area..
I have seen some cars count speed off 2 abs sensors on same wheel (avg pulses)

And yes you have a bad wire.. It is popular for the rear Axle sensor, wire to break from the Axle movement or a connecter gets loose..
otherwise I have seen rodents get the wire, many times this wire is a twisted pair since it is a signal ..

Try to find a wiring locator..

I had some fords do the same thing.. I have rerun 25 feet of new wire ,, LOL just to save time.
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Old 10-04-2022, 09:54 PM   #4
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I have the same chassis but haven't a clue where the signal originates. You might consider trying to duplicate a wet road by spraying each wheel, one at a time then going for a short drive to watch the speedo. then if necessary the tranny tailshaft.


I remember back in 2013 my ABS light would stay on intermittently. My auto mechanic told me to use my high-pressure washer on straight-stream and clean the backside of each wheel, as often road grime will clog the openings in the wheel tone-ring.


It worked! The ABS light now only comes on at initial dash warning light check.
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Old 10-04-2022, 10:45 PM   #5
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The wiring info I have for gauges on a 2001 Spartan chassis , shows no connection to the ABS module only the Trans and engine and other sensors .

So I believe the trans output speed sensor , or connection to same , is most likely the issue .

Check the trans ECM for codes using the key pad .
Attached Files
File Type: pdf Allison all codes.pdf (2.09 MB, 5 views)
File Type: pdf 2001 Spartan MM_MMGT Newmar Chassis Electrical gauges.pdf (154.1 KB, 5 views)
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Old 10-08-2022, 04:31 PM   #6
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Skip426. Thanks for the information. I will have to check the transmission codes when I get a chance. It says the transmission temperature needs to be above 140 so I will have to road test it and get everything up to temperature. Donít plan on that for a few weeks but I will let you know how it works out. Thanks again for the reply

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Old 10-08-2022, 04:36 PM   #7
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Quote:
Originally Posted by Skip426 View Post
The wiring info I have for gauges on a 2001 Spartan chassis , shows no connection to the ABS module only the Trans and engine and other sensors .

So I believe the trans output speed sensor , or connection to same , is most likely the issue .

Check the trans ECM for codes using the key pad .


Skip426
Thanks for the info. Says the transmission has to be up to 140 to check the codes. I will have to road test it and get it up to temp. Will be a few weeks before I can get a chance to test it but I will let you know how I make out with it. Thanks again for the info
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Old 10-12-2022, 07:25 AM   #8
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Dick ; I believe the 140 degree temp is a requirement for fluid level test only , reading DTCs can be done any time .
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