1999 grand cherokee lerado check engine light

1999 JEEP GRAND CHEROKEE
130,000 MILES • 6 CYL • 4WD • AUTOMATIC
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ZARKON0007
  • MEMBER
  • 2 POSTS
hi. the check engine light on my jeep doesnt come on when you turn the key on. it does work because it has gone on a couple of times do to a vacume leak. i cant get a sticker till it does the self check and i dont have a clue as to what it is doing. any help would be appreciated
thanks
Dec 21, 2010 at 4:28 AM
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CJ MEDEVAC
  • ✓Experienced Mechanic
  • 11,000 POSTS
Well, I do not know your rig well

But I've been told all this time that the "KEY ON" Position "Verifies" that the Dash Warning lights are in "WORKING ORDER" Not only the Check Engine, but the OIL, TEMP ETC (Basically Idiot lights that have taken the place of Gauges)

So, the 1st thing I would do is run thru the fuses (owners manual will show all locations) and insure there is not a BLOWN one.(EZist to try 1st)

Then the Next Step would be INVESTIGATE A BAD CHECK ENGINE BULB BEHIND THE DISPLAY....This may be a little more involved

Let us know how it turns out

The Medic
Dec 21, 2010 at 7:46 AM
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ZARKON0007
  • MEMBER
  • 2 POSTS
the light it self works. i have verified this by leaving the gas cap loose and it comes on. when i check the computer with an obd scanner it shows a code for the fuel system. the only time it doesnt come on is when the key is turned on
Dec 22, 2010 at 3:04 AM
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MHPAUTOS
  • ✓Experienced Mechanic
  • 31,937 POSTS
I would be checking that the globe in the dash is OK, often this can be the case with no check light.

mark (mhpautos)
Jan 7, 2011 at 3:46 PM
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