Xj CEL light on after changing all the fuses - JeepForum.com
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Unread 06-04-2014, 11:18 PM   #1
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1999 XJ Cherokee 
Join Date: Jun 2014
Location: Scottsdale, Az
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Xj CEL light on after changing all the fuses

I recently decided to change all the fuses on my xj in the fuse box in the passenger side panel. Inadvertantly I didnt disconnect my battery before doing this. I know, major mistake. After putting the fuses back, The check engine light came on. As a result my aux radiator fan is not engaging. I have replaced the fuse under the hood, and ran a bypass to check if the fan works and it does.however it does not come on when the temp gets to 210.it doesnt come on at all. What did I do to the ecm? im at a loss. Please help.

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Unread 06-05-2014, 11:15 AM   #2
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2000 XJ Cherokee 
Join Date: Apr 2002
Location: out in the garage - Minneapolis, Minnesota
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I would suppose that you forgot to re-install a fuse, perhaps the one for the e-fan, or that the e-fan fuse blew.

To test the e-fan system, disconnect the wire plug from the Coolant temperature Sensor on the thermostat housing, if the e-fan starts up, everything is OK. The e-fan normally comes on at about 215-218*.


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Unread 06-05-2014, 12:32 PM   #3
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#10 fuse in the JB is the one you want to look at. If you don't have a JB diagram, it's the 5th fuse up from the bottom, on the forward bank of fuses. A 15 Amp fuse.
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