No spark from the coil wire?

2002 Chevrolet Astro van mileage: 58,000.I have replaced the fuel pump, coil, and module p/u in the distributor. I have power to the coil and to the back of the distributor to the module, but still no spark from the coil wire to the distributor, HELP. Where to go next. It is not showing any code last time I check the ECM.