The camshaft position sensor (CMP) should have battery voltage on the pink wire when the key is on. It gets power from the 20 amp ENG 1 fuse in the underhood fuse block. Check that fuse.
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http://repairpal.com/chevrolet-repair-in-sycamore-illinois
RepairPal Certified shops can diagnose and repair your 2000 Chevrolet Astro. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.