no, on your computer youll see an ecm number on it, you have to match that number with a number on a new computer otherwise it wont run right.
a jeep Cherokee need 220 volts to run
Turn the AC on and the electric fan on the radiator should run.
Is your key chipped? There is a microchip built into the key as a anti theft device.
Largest that you can run are 30" tires on the stock suspension but they will rub at full flex.
There is no afs on a cherokee, they run on a map sensor.
if your talking about the a/c it is the one closest to the dryer or the round cilnder that your a/c hoses run into.
If it is a grand Cherokee there is another relay under pass side headlamp. After you remove the headlamp you have to drill a big hole with hole saw or you could do it the way jeep says to and remove the whole front face and the support.
Unplug wires and run a hot from the battery to the hot on fan and a ground from the fan to the ground on the battery, this will test the fan.
Possibly the crankshaft positioning sensor or Neutral Safety Switch
You need a new battery. The same exact problem just happened to me in my 2002 jeep grand cherokee. The computer in the vehicle wont let it run unless it is getting a high amount of voltage from the battery. When you replace the battery, the problem should be fixed.
TAke it to the dealer where they have the proper machines. That last answer really sucked, spoken like an union mechanic. Go to this link: http://www.justanswer.com/questions/1jjd3-2000-grand-cherokee-split