1989 Plymouth Acclaim no spark

There may be an rpm signal generator in the distributor. The computer has to see rpm signal or it won't ground the asd relay. The asd relay supplies voltage to several systems, one of which is the ignition coil. Check the gray wire at the ignition coil for voltage, engine cranking. That's a primary wire, the voltage won't hurt you.

Can you check for applicable mil codes? To check for codes, you turn the key, just till the dash lites come on, no further. Cycle the key on--off, on---off, on. Then the mil on the dash starts flashing you count the flashes to get the codes. You looking for two digit codes.