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Old 02-25-2019, 06:54 PM   #1
Holiday Rambler Owners Club
Join Date: Aug 2012
Location: Oak Harbor, WA
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Can Bus & J1939 ISB to Allison 2500MH

Is it a fair assumption that Cummins ISB CR ECU communicates with with the Allison 2500MH via the Can Bus and J1939 interface?

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Old 02-26-2019, 06:50 AM   #2
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Join Date: Apr 2009
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Yes. You should see a round 9-pin diagnostic connector in the vehicle. That's the one used in J1939 applications.
Another giveaway is if you do not have a mechanical throttle sensor for the Allison. If your vehicle has the mechanical TPS, it's very likely not J1939 or J1850 equipped.
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