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No class 2 data where dose 5v power come from

Perseverellc

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Perseverellc New Member

Perseverellc

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Posted

I recently swapped a lb7 dmax in a 04 2500 hd  ive done endless research on it and its pretty strait forward. The only problem is the truck i bought to put the engine in i know. Othing of how it ran at all.

Now i have it running great no problems other than i have intermitent comms with

My code reader and  my efi live will read codes but no live data or tunning.

The class 2 data line dose not have 5v at the obd2 or anywhere in the splice pack .i get .300 to .600 v thats it theyre not sborted to ground and isolating moduals has no affect...

Where dose the 5v on the class 2 data come from ? Dose the bcm send a start up signal to the ecm ect . Or is that newer trucks .. im so close but this is a little out  of my wheelhouse

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