HI I went to hook up my laptop with cat et to my truck today and its not communicating with the ECM. When I bought the truck last year the dealer had to hotwire the ecm to read it, I figured whatever they did they would of left, But they didn't just my luck. I have a constant 12.8 volts to the "B" wire so its not that wire however I have no idea where the other 3 wires in the connector go. Its a 6 pin J1939 connector and has 4 wires total in it. Its a 04 379 with a MBN C15, does anyone have a wire schematic or know where these wires go to in the ECM? Any help is appreciated. Thanks!
CAT ET not communicating in a 04 379
Discussion in 'Peterbilt Forum' started by C15Mike, Apr 29, 2018.
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An 04 should be J1708 which is 6 pin vs J1939 which is nine pin.
Between pin c and e should be 12v.
A and B should have continuity to the pins on the ECM.
Post the last six of the S/n for the Pete digramsAttached Files:
BoxCarKidd, Oxbow, Muddydog79 and 1 other person Thank this. -
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last six are 813048 Thanks
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Cat and Pete diagrams attached. Check for power and ground first. If you have good power and ground but cannot hookup you have a datalink issue Let me know if you need help deciphering the diagrams or tracking down a circuit.
Attached Files:
spsauerland, Oxbow and Muddydog79 Thank this. -
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Awesome thanks pushbroom!!
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Same engine, same problem here. Thanks for the info fellas.
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Have you ever been able to hook up to the truck? Gliders kinda suck for diagrams because no idea whose engine harness is on it and if they added the extra datalink in the cab or not.
Goodysnap and spsauerland Thank this. -
Where and exactly what is the data link?
It’s a Pete 389 model forgot to add that earlier
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