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Old 04-15-2013, 06:27 AM   #1
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Non-working transmission temp guage

Anybody know where the gauge connects to the tranny? I suspect it came loose somehow. Cummins 400 hp
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Old 04-15-2013, 11:21 AM   #2
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Could we get more info on your coach and chassis . Year, chassis maker .
Allison trans temp sensor, is internal in trans , most years. Sensor operation can be confirmed with a break out box. Your dash gauge may be the problem.
More info = better answers.
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Old 04-16-2013, 05:45 PM   #3
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Sorry for lack of info. 2005 Itasca Horizon 40', Allison transmission, Freightliner chassis
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Old 04-17-2013, 09:59 AM   #4
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Freightliner , uses a data collection system, that broadcasts all the info from the engine & transmission to the dash gauges, over a data buss , a twisted pair of wire that runs from the data collection computer to the gauges in a process called multiplexing.( multiplexing ; each gauge responds to data on a set frequency) You may have a bad gauge, but there are many posts about bad soldered connections in the data collection computor , as well as info on how to test and repair your own.
I'll track them down and re-post , where you can find them.
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Old 04-17-2013, 10:53 AM   #5
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Ok, took some digging but I found it.
In the Freightliner Chassis forum, click the search this forum drop box and enter
Gauges Air Brakes By Molezzo
look through the posts for #5 by Fred Cooper and download the PDF file on gauge and V.I.M. ( Vehicle Information Module )testing , from the link he provided.
Also the Free Freightliner help line 1-800-385-4357 have your serial number handy. Inquire about joining Access Freightliner , for internet access to wiring and parts info. Takes a few weeks but well worth it.
When I find the VIM repair info I'll re-post.
F/L may have re-named the module ; now MMIC ? I'll look into that too.
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