Exhaust Gas Recirculation Temperature (EGRT) Sensor: Notes
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The EGRT bank 1, sensor 2 (EGRT12) is a thermistor device in which resistance changes with temperature. The EGRT 12 sensor is an input to the PCM. The electrical resistance of the sensor increases as the temperature decreases, and the resistance decreases as the temperature increases. The varying resistance changes the voltage drop across the sensor terminals and provides electrical signals to the PCM corresponding to temperature.
The EGRT sensors are used to determine if the EGR cooler is operating correctly. The EGRT bank 1, sensor 1 (EGRT11) monitors the exhaust gas temperature before the EGR cooler and the EGRT bank 1, sensor 2 (EGRT12) monitors the exhaust gas temperature after the EGR cooler.