Can J1939 be enabled or disabled on a CM870
06-21-2022, (Subject: Can J1939 be enabled or disabled on a CM870 ) 
Post: #2
RE: Can J1939 be enabled or disabled on a CM870
Are you using the 'Upload' option or are you trying to 'export' it?

The de-mandate file could also be corrupt, causing it to fail when copying it as well.

Do you know what your esn# is?.. and what program it is reporting it has in the ecm?.

Also, the most important thing to backup is the truck settings themselves. This can be done simply by making a work order, an ecm backup, and ecm template in Insite.

Just an FYI: On a CM870, copying the program out of the ecm to have it reviewed or to use it as a reference for certian settings is ok, but any backup of the ecm with Calterm on a CM780 cannot be re-used into another ecm, or copied back in without it corrupting the ecm. Newer engines (CM871 and newer) do not have this issue.

Last but certainly not least .. just because your truck has lasted for 12 years on a de-mandate file.. does not mean that file is decent at all. Even the worst de-mandates out there that are horrible for the engine all the way thru, there is always a few people here and there who get lucky, and their engine did not seem to fail prematurely. Put even the worst big-box horrible engine killing de-mandate programing into 100 engines, and 80% of them will fail with big problems prematurely, but about 20% of them will slip thru thru the cracks and 'seem' to run without as many issues due to the differences in how the truck is driven and a lot of other factors.


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 Thanks given by: Hamish


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RE: Can J1939 be enabled or disabled on a CM870 - Rawze - 06-21-2022



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