It receives signals from the camshaft and crankshaft position sensors and outputs the primary ignition pulse in the proper sequence. That pulse goes into the coil pack, where it is converted to the high-voltage pulse that reaches the spark plugs.
Originally Posted by jeymie'sSC
In the early model SCs (1989-1993), the ignition module is pretty important. It's a lot more complex than the old ignition modules (TFI modules) that were on distributor-equipped Ford cars.
If the distributorless ignition module goes bad, the car will misfire badly.
1990 SC auto ... red outside, gray cloth inside ... ~205,000 miles (and climbing) ... driven daily!