Nissan Repair Questions? Ask a Mechanic for Answers ASAP
Have you inspected the timing belt and cams? For the pin to sheer off for the distributor, the shaft of the distributor would have had to seized and that can cause the cam to stop to fast and stripped or broken the timing belt.
Also did you replace the distributor, or did you just replace the pin?
If it is in time, then you do not have to reset the ecm. Have you checked all of the fuses to see if you had 12 volts on both sides of them with the ignition switch in the run position?