Theory Of Operation
WARNING: This page is about a different car, the 2015 RAM 1500. However, it is still accessible from the selected car via links, so may be relevant.
The Engine Coolant Temperature (ECT) Sensor is located on the left side of the engine block under the Intake Manifold. The ECT Sensor operates as a typical two wire sensor. It receives a 5-Volt signal on the ECT Sensor Signal circuit and sensor return on the Sensor Ground circuit. When this fault code is active the EGR system will be disabled.