Sensor, Diesel Exhaust Fluid, Pressure: Operation

The Diesel Exhaust Fluid (DEF) Pressure Sensor is a three wire sensor, housed inside the DEF Supply Pump that monitors supplied pressure to the DEF Injector.

• The DEF Dosing Control Unit provides a 5-Volt supply and ground to the DEF Pressure Sensor.
• The sensor provides a signal to the DEF Dosing Control Unit on the DEF Pressure Sensor Signal circuit.
• This DEF Pressure Sensor Signal voltage changes, based on the diesel exhaust fluid pressure supplied by the DEF Supply Pump.
• The DEF Dosing Control Unit uses this information to vary pump speed and maintain the 130 psi (9 bar) pressure needed for proper DEF Injection.