Does Nissan make diesel engines for Mazda?

Nissan doesn't even build their diesel engines. Nissan Diesel was bought by Volvo in 2007. Side note: in 2015 Nissan will offer a Cummins in the Titan truck. Mazda is owned by Ford and has produced its own diesel engine for years. They are currently built in the Ford factory in Dagenham, London, England.