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having trouble with ths one pcm not commuicting says protolcal interal failure please help i have checked all grounds ive checked all relays all fuses are also good but still will not run it acts like it wants to but doesnt on my scaner in the data it says the coolant temp is hot i unpluded it no change i work at a shop and been doing kinda work for years but this is the first time ive havnt been able to figure it out someone tell me what ive missed
 

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you need the 5volt ref for comm

a shorted sensor or shorted 5v ref will cause a no comm

unplug the act or ect, whatever is easiest, and see if the 5v is there

key in run
 
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