Amid a revival in sales of Japanese goods in China and talk of renewed investment from some big firms such as Toyota, a dusty industrial park near Nanjing offers a cold reality check on the health of ties between Asia's two biggest economies. Despite offering rent-free premises for the first three years to companies expanding to China, the Japan Automotive Parts Industrial Center , set up in Danyang, 200 km west of Shanghai, in 2011, remains near empty.