I diagnosed Jeep Wrangler 2011 using MaxiSys Pro and it was auto scanned but did not get a chance for Cherokee. Is OBDII communication working on Cherokee? Keep a cheap ELM327 tool with you to verify OBDII communication, e.g. one from www.scantool.net. It's not so cheap but as compare to MaxiSys Pro and better than other clone ones. You can use it also with Torque Pro software. Nowadays, OBDLink SX is on discounted price of US$ 29.95 and free delivery in USA.