Does Caterpiller make 2 different 9 pin connectors?
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by TowHaul, Feb 21, 2023.
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The cat data link (CDL) adaptors have j1939(just on different pins) but doesn't have j1708, which the truck side will have, and with the year of your truck some of the computers may still communicate primarily over the j1708 side.
I've even seen early 2000's trucks that have the 9pin j1939 plug installed in them but don't actually have j1939 wired up at all, they just used j1708. -
yes it is a knock off com 3 adapter...
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just odd to me that there is not one other fellow "com 3 adapter/ Cat ET diagnostic tool 317-7485" owner operator out there? I am the only one on this site to attempt to diagnose my CAT Engine from home rather than pay the $500 the dealer wants just to run a 20 minute (at most) test?
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