1993 JEEP GRAND CHEROKEE CRANKS BUT WILL NOT START

  • Tiny
  • jansenmounce
  • 1993 Jeep Grand Cherokee
  • 5.2L
  • V8
  • AWD
  • automatic
  • 160,000 miles

The engine compartment of my jeep got soaked from a coolant issue I was having and now it will not start. I have fuel but no spark. Also no power to the coil, ASD relay appears to be working properly.

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Thursday, January 9th, 2014 AT 3:49 PM

5 Replies

  • Tiny
  • caradiodoc
  • Expert
  • 25,453 posts

Please elaborate on "ASD relay appears to be working properly." If it is, you should have 12 volts at the ignition coil. How are you measuring this voltage? Why do you say the fuel pump is working?

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Thursday, January 9th, 2014 AT 4:12 PM
  • Tiny
  • jansenmounce
  • Member

I got fuel pressure at the fuel rail and I can feel the relay working when I turn the key on. I think something must have got wet under the hood

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Thursday, January 9th, 2014 AT 4:44 PM
  • Tiny
  • caradiodoc
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  • 25,453 posts

This is the common and incorrect way to check things. The Engine Computer is going to turn on the automatic shutdown (ASD) relay for one second after turning on the ignition switch. That is why you mistakenly think you have fuel pressure. What you have to check for is if that relay turns on again during engine rotation, (cranking or running). If it does not, the fuel pump will not continue to run, and there won't be any voltage to the ignition coil, injectors or alternator field.

Measure that voltage at the ignition coil again, but see if it comes back when you crank the engine. Have you checked for diagnostic fault codes?

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Thursday, January 9th, 2014 AT 6:21 PM
  • Tiny
  • jansenmounce
  • Member

Yes I have a code 41

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Saturday, January 11th, 2014 AT 6:34 AM
  • Tiny
  • caradiodoc
  • Expert
  • 25,453 posts

41 An open or shorted condition detected in the generator field control circuit

That isn't related to a no-start condition.

Did you check for proper operation of the ASD relay during cranking?

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Saturday, January 11th, 2014 AT 8:10 PM

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