Yeah I have heard of the smoke test. If there is no out ward leaks more then likely it's the pump that check the system. It could be an ecu error, but at this point my guess is nissan will replace a majority of the items in the system. Manufacturer's will try a lot of things before they buy back a car, I only ever saw 1 car get bought back. GL though.
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Biding my time till I get one. Waiting and watching  .
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