F 250 2WD Super Duty V8-7.3L DSL Turbo VIN F (1999)
Exhaust Pressure Sensor: Description and Operation
The Exhaust Back-Pressure 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 Exhaust Back Pressure Sensor measures the pressure in the RH exhaust manifold. This sensor is used in
conjunction with the exhaust back-pressure regulator to form a closed loop exhaust back-pressure control system. The exhaust back-pressure is
controlled by the PCM to provide more heat to the coolant for cab heating when ambient air temperature is below 7°C (45°F) and engine oil
temperature is below 75°C (167°F) during low load, low speed operating conditions. An open or short in the Exhaust Back Pressure Sensor wiring will
result in a low out of range voltage at the PCM, and the PCM will disable Exhaust Back-Pressure control.
