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2000 Chevy Blazer check engine light

Tiny
COTTRELL3758
  • MEMBER
  • 2000 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 140,000 MILES
My check engine light came on in my blazer the other day and I hooked up a scan tool to it and it came back with p0452 which "is the voltage signal from the evaporative emissions control sensor is too low for the current operating conditions" I tightened the gas cap and restarted the engine, and hte light went off two days later it came back on. What is the most probable cause for this. By the way we replaced the fuel pump about a monthe and a half ago and a few weeks later it would crank but not start. We checked fuel pressure, replaced fuel filter and teasted, then reconnected wires. Havents had a problem since. Could this be related?
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Monday, August 4th, 2008 AT 7:54 AM

1 Reply

Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
Make sure your gas cap is still good, the rubber and vents in it wear outsometimes.

If thats good double check all vaccum connections from the charcoal canister all the way back to the tank, also check the wiring connections on the ftp. Fuel tank pressure.
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Monday, August 4th, 2008 AT 10:25 AM

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