Hilfe mein TJ 2,5 l springt nicht mehr an

"You see NO BUS and the engine does NOT run. This is usually an engine management sensor shorting out and 99% of the time, it is the crankshaft position sensor. But it theoretically could be any of the 5 volt engine management sensors or even the computer itself. Best strategy here is to remove the suspects from the bus one at a time and see if that resolves it. For example, remove the connector from the crank sensor, then turn the key to the on position. If the NO BUS is gone with the crank sensor out of circuit, you have proof positive that the crank sensor is to blame."
Quelle: Jeepsunlimited.com

Ansonsten schreiben alle, das es ein Kontaktproblem sein muss. Also, alle Stecker abziehen, schauen ob die korrodiert sind Kontaktspray rein und hoffen.