Cummins ISX11.9 CM2250 – Service Manual 019-445   Crankcase Pressure Sensor

The crankcase pressure sensor is used to monitor the pressure in the crankcase.

The crankcase pressure sensor is located at the crankcase filter assembly, which is located on the fuel system side of the engine.

Clean the area around the crankcase pressure sensor.

Disconnect the pressure sensor connector from the engine harness.

Remove the mounting capscrew.

Remove the sensor from the engine by pulling straight up on the sensor. Use care not to damage the o-ring when removing the sensor.

Inspect the engine harness connector and the crankcase pressure sensor for the following:

• Cracked or broken connector shell
• Missing or damaged connector seals
• Dirt, debris, or moisture in or on the connector pins
• Corroded, bent, broken, pushed back, or expanded pins.

Inspect the crankcase pressure sensor for the following:

• Swollen o-ring
• Nicks or cuts in the o-ring.

Install the crankcase pressure sensor by pressing firmly on the top of the sensor until the o-ring is fully seated.

Install and tighten the mounting capscrew.

Connect the engine harness to the crankcase pressure sensor. An audible click will be heard when the connector locks in place.

Start the engine and check for leaks.

Shut off the engine.

Connect INSITE™ electronic service tool.

Operate the engine and check for fault codes.