Cranks but wont start
 

I have a 2001 grand jeep cherokee Loredo 4.0 L6. I need help understanding why the jeep will crank but not start. I have no check engine light on and i had a diagnostic test ran on it and the shop couldn't find any issues either. To me it sounds like a simple issue to fix but i cant seem to find the reason it wont start. Does anyone have any ideas or know what the cause of it not starting may be?

Gotta have spark,air and fuel.

Welcome to CF!

Check the CPS for a pulse. If the PCM doesn't get a reference pulse, it won't energize the ASD relay and turn on the fuel pump, spark and fuel injectors.