F 350 4WD Super Duty V8-6.4L DSL Turbo (2008)
Pressure Feedback Exhaust Sensor: Description and Operation
EXHAUST PRESSURE (EP) SENSOR
Exhaust Pressure (EP) Sensor
The EP sensor is a variable capacitor sensor that is supplied a 5-volt reference signal by the PCM and returns a linear analog voltage signal that indicates
pressure. The sensor voltage input to the PCM increases as the pressure increases. The EP sensor, located at the left rear of the engine, measures the
pressure in the exhaust manifold. The sensor feedback signal is used for variable turbocharger geometry and EGR valve control.
An open or short in the EP sensor wiring results in an out-of-range high or low voltage, at the PCM.
The output of the sensor ranges from 0.175 volt at 28.6 kPa (4.15 psi) to 4.825 volts at 616.5 kPa (89.42 psi). At an atmospheric pressure of 101 kPa
(14.65 psi) the output of the sensor is between 0.67 and 0.82 volt.
