If its a Bluetooth OBD II diagnostic tool, I have heard of problems with some of them connecting to some Nissan vehicles. If the fuses are good, you might take your truck to a place like Autozone and see if their tool with connect. If it won't, then you'll have to go to the factory service manual "Engine Control" chapter and go through the diagnostic steps for the symptom of "no communication with ECM." That service manual section should be in this site's "knowledge base" section.
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