I don't think Japanese monetary policy in the 1990's really qualifies as Keynesian..
They had a zero % interest rate and pioneered the concept of quantitative easing, but the theory underlying the policy wasn't exactly based on being able to manage growth through government spending
from an article on japanese fiscal policy in the 90s:
"In the end, the September 1995 stimulus package did add significantly to economic growth in 1996. Not only was the actual real GDP growth of 3.6 significantly higher than the 0.9 percent recorded in 1995, it was at least 0.9 percent higher than the growth forecasted for 1996 by all of the major international institutions and the financial consensus...This stimulative effect can largely be attributed to the fiscal package, although the decline in the yen also stemmed the decline in net exports (by -1 percent of GDP in 1995 and by -0.4 percent in 1996)...There was actually no other source of positive impetus to the Japanese economy in late 1995 and early 1996 that can be identified except discretionary fiscal policy."
