Possible Causes
WARNING: This page is about a different car, the 2005 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.
AAT SENSOR VOLTAGE BELOW 0.3 OF A VOLT
AAT SENSOR
(G31) AAT SIGNAL CIRCUIT SHORTED TO GROUND
(G31) ATT SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND
PCM