Question

2009 Nissan Navara d4d 2.5L diesel what is thus mean U1000 can comm circuit?

Answer 1

Nissan cars that have the U1000 the first thing to do is lossen all the ground connecters clean them with sand paper on the connector and body and retighen the bolts back 

There will be a few by the engine bay and will look like this lossen all the ground connecters clean them with sand paper on the connector and body and retighen the bolts back 

 

here is the service bulletin from nissan 

https://www.autocodes.com/uploads/nissan/NTB06-009a.pdf

You can also add a grounding kit to help the factory grounds since the factory grounds are thin and can lose connecting since you can rust and or have corrosion.