CEL question - JeepForum.com

 
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post #1 of 4 Old 04-13-2010, 05:20 PM Thread Starter
msprooch
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1995 YJ Wrangler 
 
Join Date: Nov 2009
Location: Westfield
Posts: 411
CEL question

When you turn on the jeep shouldn't the Cel light come on? Mine doesn't but my jeep still runs, not to well but it runs.

I know that the bulb can be bad but I wonder if my computer is dead or a bad fuse.

If this helps my seat belt light works and so does my shift light. I don't know if the ecu controls these or if something else does.

Thanks for the help.

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post #2 of 4 Old 04-13-2010, 05:24 PM
idaholtby
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1991 YJ Wrangler 
 
Join Date: Apr 2008
Location: Meridian
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Quote:
Originally Posted by msprooch View Post
When you turn on the jeep shouldn't the Cel light come on? Mine doesn't but my jeep still runs, not to well but it runs.

I know that the bulb can be bad but I wonder if my computer is dead or a bad fuse.

If this helps my seat belt light works and so does my shift light. I don't know if the ecu controls these or if something else does.

Thanks for the help.
Yes, The CEL lamp should come on when the ignition is first turned on before going to start. Because your rig still starts, I would guess that a previous owner removed or disabled the lamp to help with it's sale.
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post #3 of 4 Old 04-13-2010, 05:28 PM Thread Starter
msprooch
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1995 YJ Wrangler 
 
Join Date: Nov 2009
Location: Westfield
Posts: 411
Quote:
Originally Posted by idaholtby View Post
Yes, The CEL lamp should come on when the ignition is first turned on before going to start. Because your rig still starts, I would guess that a previous owner removed or disabled the lamp to help with it's sale.
Im the only owner so I didn't do that I will check the light. Thanks for the info.
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post #4 of 4 Old 04-13-2010, 05:54 PM
idaholtby
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1991 YJ Wrangler 
 
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Location: Meridian
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Quote:
Originally Posted by msprooch View Post
I'm the only owner so I didn't do that I will check the light. Thanks for the info.
Pin 32 on the ecm supplies the ground for this lamp. If the bulb or it's contacts are not bad, then chase this signal back to the ecm connector. Frequently when the CEL does not illuminate when the ignition is first turned on, then it is an indication that the ecm is not powering up and the rig will then not start. This scenario is due to bad capacitors in the ecm which is easily fixed, but your rig starts. Does your lamp ever come on, even if you wait a spell before starting?
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