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suspension problems. on 1991 Cadillac Seville

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
my ccr system is not working, air compressor is not activating . I need a diagram and some troubleshooting info . my computer reads (cheak ccr system)
(1) Answer
for a diagram i would go to sinautoscan.com under forum make a request there's no way to post a diagram here.