The 2002 is OBD II compliant, go to the store and buy a diagnostic code
reader, or use theirs for free. AutoZone will pull the codes for you, they
simply plug the code reader into the data port on the bottom of the
dashboard (near where you left leg rests while driving).

On your '91, there is no need to run the engine to 2500 RPM. Just turn the
key on and off 5 times within 5 seconds, then leave it on and count the
flashes.






"reconair" <reconair@staffnet.com> wrote in message
news:11sr60tj4h1a693@corp.supernews.com...
> How do you check the diagnostic codes on this model vehicle? It's a 02
> Cherokee Sport with the 4.0L and auto transmission. I assumed I could
> check it the same way as I do my 91 YJ 4.0L by running the engine to 2500
> rpm, letting the rpm drop and turning the ignition off, then on, then off,
> and back on and waiting for the Check Engine light to flash out the number
> pairs, but it don't work that way.
>
> Help appreciated.
> Scott
>

 

The 2002 is OBD II compliant, go to the store and buy a diagnostic code
reader, or use theirs for free. AutoZone will pull the codes for you, they
simply plug the code reader into the data port on the bottom of the
dashboard (near where you left leg rests while driving).

On your '91, there is no need to run the engine to 2500 RPM. Just turn the
key on and off 5 times within 5 seconds, then leave it on and count the
flashes.






"reconair" <reconair@staffnet.com> wrote in message
news:11sr60tj4h1a693@corp.supernews.com...
> How do you check the diagnostic codes on this model vehicle? It's a 02
> Cherokee Sport with the 4.0L and auto transmission. I assumed I could
> check it the same way as I do my 91 YJ 4.0L by running the engine to 2500
> rpm, letting the rpm drop and turning the ignition off, then on, then off,
> and back on and waiting for the Check Engine light to flash out the number
> pairs, but it don't work that way.
>
> Help appreciated.
> Scott
>