F 350 4WD Super Duty V8-6.4L DSL Turbo (2008)
Exhaust Temperature Sensor: Description and Operation
EXHAUST GAS TEMPERATURE (EGT) SENSOR
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 3 EGT sensors to monitor the exhaust gas temperature. The first sensor is located before the OC. The second sensor is
located between the OC and diesel particulate filter. The third sensor is located after the diesel particulate filter.
