what does the inhibit relay do&ASCD holdrelay to the far right side?ho and also on 1997 Mercury Villager

my 97 villager died on my way to work and got it home,it turn over,so figure it would be fuel pump went and got one,stillwont start,tested fuel relay ,ok im getting the pump to work when i jump wireit.but still no me find the problem,i just got a obd,&ampmettr.