Crank no start issue

Tiny
HENRY TUBBS
  • MEMBER
  • 2000 MERCURY MARQUIS
  • 4.6L
  • V8
  • 2WD
  • AUTOMATIC
  • 77,000 MILES
Car cranks will not start. No engine light, code reader shows nothing, no fuel pressure. Changed fuel pump did not help at all. Changed PCM did not help.
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Saturday, November 3rd, 2018 AT 10:57 AM

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Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,554 POSTS
Hello,

It sounds like you have a PCM relay that is not working. Here is a guide to help you test it and the engine wiring diagrams so you can see how the system works along with the location of the relay:

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.

Cheers, Ken

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Sunday, November 4th, 2018 AT 11:52 AM

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