Engine Operation 48 UENR0623-02 Illustration 45 g03360405 Schematic for the DPF differential pressure sensor for the 854E-E34TA (model JR) engine and 854F-E34T (model JS) engine The ECM supplies 5 DC volts through the ECM connector to each sensor. The power supply is protected against short circuits. A short in a sensor or a wiring harness will not cause damage to the ECM.