Chevrolet Beretta No Spark at Plugs
If your ignition control module is good, and you replaced your crankshaft sensor, but it still wont fire, I would check a few more things before replacing the PCM.
Check to make sure you have battery voltage on the pink wire going to the ignition module with the ignition switch in on. If not, suspect ign fuse 15a in the fuse block. If you do have power, then check the wires going from the PCM to the ignition module. These should be the orange and white wires. If I am reading this diagram correctly, the orange pin is c1 c15 and the white is c2 b8 on the PCM connector. If these wires are good, then check the ground on trhe black wire going to the ignition module. If all wiring checks good, I would inspect the pick up at the crank shaft sensor.
If all checks are normal, then it does sound like a bad PCM.
Suggested Repair
Before replacing the PCM, verify battery voltage on the pink wire to the ignition module with the key on and check the 15A ignition fuse if power is missing. If power is present, inspect the orange and white PCM-to-module wires, the black module ground, and the crankshaft sensor pickup. If those checks are normal, the PCM is the likely fault.
Conversation Summary
A Chevrolet Beretta with 175,000 miles cranks but will not start. The owner replaced the plugs, wires, and crankshaft sensor, confirmed fuel pressure, and found the coils and ignition module tested good, yet there is spark at the coils but not at the plugs. The expert advised checking module power and the ignition fuse, the orange and white PCM wires, the module ground, and the crankshaft sensor pickup before concluding the PCM is bad.
