Most of 10 EUR Chinese ELM327 devices do not support ISO 9141-2 and J1850 data protocols that are needed for Jeep WJ diagnostic and will display connection error even if some other generic diagnostic app can connect to some module. We highly recommend to use good ELM327 and avoid fake Chinese devices. Supported functions of WJdiag Pro are listed on our website tutorial page at WJdiag is working with Bluetooth ELM327 device through OBD2. WJdiag Pro is made for diagnosing issues of Jeep Grand Cherokee 2002-2004 year, WJ/WG models with 2.7 CRD engine.
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