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Crank sensor has no power - Engine not starting?

Tiny
TERRY CALDWELL
  • MEMBER
  • 1995 GMC JIMMY
  • 4.3L
  • V6
  • 4WD
  • AUTOMATIC
  • 182,000 MILES
Took through the car wash ran while washing it shut off when I put it in gear, started it back up and took it down the highway where it shut off while coasting. Crank sensor has no power when starting but power when key on. Faulty crank sensor or wiring? Where does it draw power from/what computer controls it?
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Sunday, January 29th, 2023 AT 6:53 AM

6 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,674 POSTS
The first thing we need to do is check all fuses with the key on. here is a guide to help with the fuse locations in the diagrams below:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

If all fuses are good, you may have a PCM that went out. The crankshaft sensor is solely controlled by the PCM, this is why we need to check the power fuses to it. Check out the images (below). Please let us know what you find.
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Sunday, January 29th, 2023 AT 6:23 PM
Tiny
TERRY CALDWELL
  • MEMBER
  • 4 POSTS
Replaced crank sensor, when that didn’t work stuck a fuel pressure gauge on there out of wishful thinking and discovered 10lbs of pressure. I found the problem but thank you for helping.
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Sunday, January 29th, 2023 AT 7:51 PM
Tiny
TERRY CALDWELL
  • MEMBER
  • 4 POSTS
Replaced crank sensor, when that didn’t work stuck a fuel pressure gage on there out of wishful thinking and discovered 10lbs of pressure. I found the problem but thank you for helping.
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Sunday, January 29th, 2023 AT 7:51 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,674 POSTS
Nice work, here is how to change the fuel pump out in the images below but I would check the fuel filter as well. Here is how to drain the tank:

https://youtu.be/Q5MH2gnyFH0

Do not remove the fuel tank with gas in it. Check out the images (below). Please let us know what happens.

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Monday, January 30th, 2023 AT 11:22 AM
Tiny
TERRY CALDWELL
  • MEMBER
  • 4 POSTS
Got the pump out, the hose had been blown. Cheap fix and I’m happy with it. Thank you for your help I appreciate it.
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Monday, January 30th, 2023 AT 8:59 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,674 POSTS
That is good to hear, would you consider helping us keep the site going by using our GoFundMe page? https://gofund.me/c7d318ad
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Tuesday, January 31st, 2023 AT 10:41 AM

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