The Oil Pressure Sensor (OPS) is installed into the main engine oil gallery. A typical location is the left rear corner of the cylinder block. See Figure
Engine Oil Pressure Sensor Location
The OPS sends an electrical signal to the ECM telling it what the engine oil pressure is at any given speed. A low oil pressure signal exceeding seven seconds is used by the ECM to begin the stop engine or warning function.
Replacement of the Oil Pressure Sensor
The OPS is non-serviceable and should be replaced as a unit. No adjustment is required.
Removal of Oil Pressure Sensor
Remove the OPS as follows:
Disengage the locking tang on the three-wire connector. Grasp the body of the connector and gently pull it free of the OPS.
Use the appropriate wrench on the hex end of the OPS to unscrew it from the engine.
Installation of Oil Pressure Sensor
Install the OPS as follows:
The OPS is an electronic device. Use care on installation.
Place the sensor on the engine and using the appropriate wrench on the hex portion of the sensor tighten it.
Use Loctite Pipe Sealer with Teflon, PT-7260
, (or equivalent) on all but the first two threads of the OPS to prevent leaks.
Place the connector in the socket and engage the locking tang.
Turn the ignition to the ON position. Observe the DDR for any diagnostic code(s). If any code(s) other than code 25 is logged, refer to the Detroit Diesel Single ECM Troubleshooting Manual