Can't read CEL
CF Veteran
Joined: Aug 2010
Posts: 8,357
Likes: 103
From: Canton, MI
Year: 1999
Model: Cherokee
Engine: 4.0
Here's the coil bracket ground point (G101) on my '99 motor.
The '99 alternator is internally grounded (through its case) so it won't have the '97/'98 alternator ground cable at this location.
The large cable you see goes to the battery negative post.
The '99 alternator is internally grounded (through its case) so it won't have the '97/'98 alternator ground cable at this location.
The large cable you see goes to the battery negative post.
CF Veteran
Joined: Aug 2010
Posts: 8,357
Likes: 103
From: Canton, MI
Year: 1999
Model: Cherokee
Engine: 4.0
I need some help. I am a 23 year old DIYer...and am not the best when it comes to electrical gremlins.
My CEL light came on after about 2 weeks i had a remanned 4.0L put in with better pistons. I looked under the XJ and saw I must've ripped the wires from my O2 sensor on the CAT when I was climbing through snow
Anyways, I went to replace the O2, of course no anti-seize was used before so I couldnt get the O2 out without taking a part of the cat with it. I took this as an opportunity to weld in a new magnaflow CAT with O2 slot, and Flowmaster 40 series, new bosch O2 all hooked up and tucked up.
Reset the battery/ECU, still have the CEL on. So I run to the "trusty" autozone and have them pull the codes- they can't connect it. It won't read anything. I went to O'Rielleys and had the same experience. I thought it was a simple O2 fix- it acts like I don't have a new one in either. I can smell gas out the exhaust- rich.
1) Wouldn't my mechanic that put in my remanned motor, have to use the OBD2 port to read that the motor is running things at right temp/volt/pressure?
2) Where do I start to try to read the codes the CEL is throwing?
All my sensors work, and work well. ( I manually tested it.)
I appreciate the knowledge in advance.
My CEL light came on after about 2 weeks i had a remanned 4.0L put in with better pistons. I looked under the XJ and saw I must've ripped the wires from my O2 sensor on the CAT when I was climbing through snow
Anyways, I went to replace the O2, of course no anti-seize was used before so I couldnt get the O2 out without taking a part of the cat with it. I took this as an opportunity to weld in a new magnaflow CAT with O2 slot, and Flowmaster 40 series, new bosch O2 all hooked up and tucked up.
Reset the battery/ECU, still have the CEL on. So I run to the "trusty" autozone and have them pull the codes- they can't connect it. It won't read anything. I went to O'Rielleys and had the same experience. I thought it was a simple O2 fix- it acts like I don't have a new one in either. I can smell gas out the exhaust- rich.
1) Wouldn't my mechanic that put in my remanned motor, have to use the OBD2 port to read that the motor is running things at right temp/volt/pressure?
2) Where do I start to try to read the codes the CEL is throwing?
All my sensors work, and work well. ( I manually tested it.)
I appreciate the knowledge in advance.
If you have an early production "97 you may be able to retrieve the code(s) by doing the "Key Trick" (see below).
"97 was a transition year so you may be able to do the key trick, even though you have a DLC for use by a code reader.
If you can do the key trick, post the numbers you see.
Last edited by CCKen; Jun 1, 2015 at 09:47 AM.
CF Veteran
Joined: Aug 2010
Posts: 8,357
Likes: 103
From: Canton, MI
Year: 1999
Model: Cherokee
Engine: 4.0
Do you have a '97 or a '98 XJ?
If you have a '98 disregard the above post.
It would be nice if you would fill in your Jeep info in your profile, or add it as a signature.
If you have a '98 disregard the above post.
It would be nice if you would fill in your Jeep info in your profile, or add it as a signature.
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