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Sensor, EGR Temperature: Operation

WARNING: This page is about a different car, the 2017 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

The EGR temperature sensor is a negative temperature coefficient thermistor used to measure the temperature of the EGR gas flow after it exits the EGR cooler.

The Powertrain Control Module (PCM) supplies 5 volts to the EGR temperature signal circuit. To determine the temperature of the EGR gas flow, the PCM monitors the change in voltage caused by changes in the resistance of the sensor. The PCM uses the exhaust gas recirculation temperature value for the engine protection system, and also for engine emissions control.

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