Exhaust Gas Temperature (EGT) Sensor
The EGT sensor is a resistance temperature detector (RTD) type sensor. The EGT sensor is an input to the PCM and measures the temperature of the exhaust gas passing through the exhaust system. The electrical resistance of the sensor increases as the temperature increases, and resistance decreases as the temperature decreases. The varying resistance changes the voltage drop across the sensor terminals and provides electrical signals to the PCM corresponding to temperature.
The PCM uses the input from 4 EGT sensors to monitor the exhaust gas temperature. The EGT bank 1 sensor 1 (EGT11) is located before the OC. The EGT bank 1 sensor 2 (EGT12) is located after the OC. The EGT bank 1 sensor 3 (EGT13) is located after the SCR catalyst (wide frame) or after the diesel particulate filter (narrow frame). The EGT bank 1 sensor 4 (EGT14) is located after the diesel particulate filter (wide frame) or after the SCR catalyst (narrow frame).