It appears to be built on the FF-L platform. That underpins the US's Altima (2002-2006), Maxima (2004-2008), Murano (2003-2007) and Quest (2004-2009). Size-wise, it sits between the Altima and Maxima. We don't have the QR23DE engine in the US, rather we have the QR25DE. It would have come with a 4-speed Jatco automatic transmission. It's a "J31" model, made from 2003-2008. As to why you can't get codes from the OBD II port, I don't know, unless the ECM is bad? I'm not going to jump to that conclusion because I've never worked on Japanese domestic (or, New Zealand market) vehicles.
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