YJ check engine light operation when key turned on - JeepForum.com
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post #1 of 2 Old 03-11-2019, 05:14 PM Thread Starter
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1994 YJ Wrangler 
Join Date: Jul 2007
Location: Beer City
Posts: 839
YJ check engine light operation when key turned on

This was brought up on a thread before. The YJ Check engine light going off after a couple of seconds when the key is turned on. The industry normal has been to leave the check engine light on until a certain amount of ignition reference or pulses has been received by the puter and then turn it off. In other words, in most vehicles it shuts off when the engine starts or in some cases cranks crazy fast.

I looked high and low to prove or disprove this theory. Why the hell would Jeep be out of the normal from what seemingly everybody else does? It ends up that this is a JEEP thing. I randomly found it while searching for info for the guy that "pull starts" his YJ.

The known capacitor problems with ECMS and other issues made me question if this is correct.

Note that the CHECK ENGINE lamp will illuminate
initially for approximately two seconds each
time the ignition key is turned to the ON position.
This is done for a bulb test.

Straight from the Jeep manual...... Good Lord.... I can finally sleep again... LOL>

If you cannot fix it with a hammer then it has to be an electrical problem.
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post #2 of 2 Old 03-12-2019, 07:02 PM
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1995 YJ Wrangler 
Join Date: Jun 2013
Location: New West
Posts: 5,387

Good work, Columbo!

Stop whining about the 'ride' - If your YJ ain't wrangling your soul free, then might I suggest you buy a stationwagon... at least you can fit all your bull**** in the back.
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