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