Check Engine Light not working?

Tiny
CALIFWATERDAWG
  • MEMBER
  • 1997 GMC JIMMY
My '97 GMC Jimmy 4x4 SLT with 130K miles failed a recent smog test. The tech said the computer meters all fed zero and the "Check Engine" light on the dash would not light up; which I validated by turning the ignition key to "On". The only recent service I've had was replacing the ignition switch in the steering column; which my local GMC dealership did. Other than failing the smog test, the truck runs great and would have passed. The rest of the idiot lights seem to function correctly and I can't identify any other issues, mechanical or electrical. Any idea what would cause this problem?
Saturday, November 10th, 2007 AT 5:40 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
You failed the bulb check its part of the IM240 program, the scan tool and computer problem is common when the fuse #7 PWR AUX is bad in the interior fuse panel here is a guide to help test it with the fuse location below.

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

Check out the diagrams (Below). Please let us know what happens.
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Sunday, November 11th, 2007 AT 7:45 PM

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