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Unread 07-25-2012, 05:32 PM   #1
mrfourpointo
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No MIL (Check Engine Light) = FAILED inspection?! ------> SOLVED!!

I have been going through an ongoing saga of trying to get my Jeep inspected, and I failed again today. I failed before due to bad catalytic converters (codes PO420 and PO432), although my Check Engine Light was not on. I have now replaced everything from the exhaust manifold back with stock components. I went to get it re-inspected today and the cats are good. However, the inspection failed because my Check Engine Light will not come on. A fellow JF member helped me walk through and diagnose that the light is not properly functioning here:

http://www.jeepforum.com/forum/f9/ch...-bulb-1335275/

Does anybody have any clue as to how to get the light back on? Even when I turn the key to the "on" position the light does not illuminate.

This is beyond frustrating.


Last edited by mrfourpointo; 07-26-2012 at 06:44 PM.. Reason: Reflect in title problem solved
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Unread 07-25-2012, 05:50 PM   #2
LJameson
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Take the cluster out and replace the bulb...
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Unread 07-25-2012, 05:59 PM   #3
mrfourpointo
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I assumed it was that easy. Everyone has since told me that there is no bulb, but rather an LED soldered onto the circuit board. The linked thread went through this also.
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Unread 07-25-2012, 06:53 PM   #4
LJameson
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Hmm, looks like I might be eating crow. I could've swore there was a bulb on my TJs cluster.
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Unread 07-25-2012, 07:37 PM   #5
spyder6
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TJ's have bulbs. LED's wernt thrown into the mix until the JK
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Unread 07-25-2012, 08:23 PM   #6
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you have some weird rules in the states not a thing like that here for a safe
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Unread 07-25-2012, 08:48 PM   #7
beefcake3
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may or may not help but hes changing the bulbs in the cluster

http://www.jeepforum.com/forum/f9/ga...nstall-752937/
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Unread 07-25-2012, 09:12 PM   #8
mrfourpointo
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It looks like the TJ instrument panel changed during production. I have a 2004 TJ and my panel is different than the one pictured in that thread. I have fewer bulbs than in that panel and the ones that I do not have appear to be in the locations of warning lights. Please see the pictures below for comparison.

Here is the back of my panel:



Here is the panel referenced in that thread:

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Unread 07-25-2012, 09:18 PM   #9
CJ Chet
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The 2004 TJ has LED's, NOT bulbs. The FSM says they are not serviceable. Being an ex electronic Tech I would say that they probably are if you have the soldering skills. The more difficult problem would be sourcing the replacement parts.
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Unread 07-25-2012, 09:21 PM   #10
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Quote:
Originally Posted by CJ Chet View Post
The 2004 TJ has LED's, NOT bulbs.
are you sure? when i pulled my 06's cluster i could have sworn i saw bulbs all over the whole thing. im 95% confident.
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Unread 07-25-2012, 09:33 PM   #11
CJ Chet
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There are alot of bulbs in there for general ilumination, etc., but the MIL indicator is an LED. Sorry, guess I didn't word that very well.
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Unread 07-25-2012, 09:44 PM   #12
mrfourpointo
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Assuming it is an LED, how would someone have gone about diabling that light? The picture above is as far as I disassembled the cluster because I was cautious about opening the white plastic housing. Any harm in going in further? Has anybody opened that before, and if so, would a broken LED be recognizeable?
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Unread 07-26-2012, 05:31 AM   #13
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a 'burnt out' LED is extremely uncommon most low power LED's have a burn life of 50,000 hours. to repair it you'd have to remove it from the board and solder a new one on if you can find something of appropriate size. it would probably be easier to just find a new panel
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Unread 07-26-2012, 05:47 AM   #14
lynn
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Chances are much better that a solder connection broke, than the LED actually burning out.
I agree easiest solution is to locate a new panel.
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Unread 07-26-2012, 08:03 AM   #15
mrfourpointo
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Looks like the new panel runs about $800. That is one expensive light bulb.
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