Have a 99 XJ that won't communicate on the OBDII port. Code reader powers up, goes through its cycle, and then says it won't communicate. Did all the standard troubleshooting steps but could not make it talk.
Then we put in a computer from a 2000 XJ just to see, and sure enough it communicated, so we've basically proved it's not a wiring or grounding problem. It seems to be that the original computer is the culprit.
The "new" computer is from a 2000 (ours is a 99), but both were autos, a/c, 4wd, same gear ratio....not sure what all matters when it comes to this stuff. (A) can I drive it with the 'wrong' computer and (B) how much damage can I cause by doing so?
Then we put in a computer from a 2000 XJ just to see, and sure enough it communicated, so we've basically proved it's not a wiring or grounding problem. It seems to be that the original computer is the culprit.
The "new" computer is from a 2000 (ours is a 99), but both were autos, a/c, 4wd, same gear ratio....not sure what all matters when it comes to this stuff. (A) can I drive it with the 'wrong' computer and (B) how much damage can I cause by doing so?