I have no CEL light on the dash that comes on either with they key in the on or run position.
I have an OBDII reader for my VW and it has a generic code reader built in for any OBDII compliant auto.
It cannot see or talk to the PCM.
Any ideas? the truck runs fine ASFAK and shifts perfect.
if fuse 11 is for the computer it is fine, I checked it.

 

1. Check the dash bulb.
2. Different protocols, VW is CAN-BUS, Chrysler is SAE J1979. Are you using a name brand scanner (Autoxray, Equus, etc.) or a code reader off an auction site?

 

check for any blown fuses, i had a similar problem where they couldnt read my cel because of a blown fuse

 

I have a Ross-Tech, it is a legit ODB reader.If the jeep is OBDII it will read..is it OBDII?
here is what I have
http://www.ross-tech.com/vcds/tour/obd-2.html

it "should" see it. another thing on the list
oh joy

 

96 & up is OBD2, so if it is a 99, it is OB2.

if it doesnt at least light up for a couple seconds when u turn the ignition on, then check the bulb and all the fuses like the other guys said.

most scanners just do japanese & domestics, if u have a scanner that works on german/french or other wierd imports, it probably wont work for japanese/domestics. different software

 

99 = OBDII

Try your code reader on a DIFFERENT OBDII vehicle. You must be absolutely sure that the reader works before digging into your vehicle.

If it works on another vehicle, inspect the OBD connector on your XJ. Might want to try a spray of electrical contact cleaner on that connector as well.

 

I'll just bring it to autozone and see if they can read it.
mine it seems is hit or miss on non VAG autos

 

Well I guess the bulb is dead(anyone know what size and type it is?) had the codes read and It will pass inspection YAY!
It had a codes for something with injector #6 and a few the TB.gonna clear them after it passes inspection and see if they return.