• Tiny
  • jefffrederick
  • 2000 Jeep Grand Cherokee
  • 143,000 miles

Drove car to store, engine light came on, coming out of store, car wouldnt start. After trouble shooting fuel pump, spark, decieded to check fuses. Switched fuel pump fuse with similar fuse, after a few trys, started up. Got home, waited about an hour, went to start. NOPE same prob, don't have another fuse to switch with but I'm gonna get another to see if it works again. Can't have this happen with my job. Relay possibly, Maybe. Any suggestions?

Thursday, March 28th, 2013 AT 4:37 PM

1 Answer

  • Tiny
  • caradiodoc
  • Expert
  • 25,278 posts

Don't just change a fuse. Look at it to see if it is actually blown. I doubt it is because the engine would have stalled while you were driving. The next time it won't start the first thing is to listen for the hum of the fuel pump for one second after turning on the ignition switch, then check for spark. If you get the hum but no spark the automatic shutdown (ASD) relay isn't turning on during cranking. That involves the crankshaft position sensor and the camshaft position sensor. Since the Check Engine light turned on there will be a diagnostic fault code stored in the Engine Computer. That code will indicate the circuit or system that needs further diagnosis.

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Thursday, March 28th, 2013 AT 7:22 PM

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