Protocol for Jeep liberty ‘04 3.7l for OBDII reader

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DanVan1990

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Hi all.
I got a OBDII mobile scanner to check engine diagnostic and also just track fuel consumption and stuff. Using the Car Scanner app. But it won’t connect to my cars ECU. Does anyone know why? Do you know what protocol is used or supported in the Liberty ‘04, does it support ISO 14230-4 KWP
 
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