Cummins ISX11.9 CM2250 – Service Manual 019-004   Barometric Air Pressure Sensor

Connect INSITE™ electronic service tool to the vehicle data link.

Turn the keyswitch to the ON position.

Monitor the barometric air pressure.

If the barometric air pressure is less than or equal to 523 mm Hg [20.6 in Hg] and the present elevation is less than 3.048 km [10,000 ft], replace the barometric air pressure sensor.

The barometric air pressure sensor is located on the engine wiring harness, near the ECM.

The sensor is attached to the engine wiring harness. It is not mounted to the engine with capscrews.

Slide the locking tab sideways.

Push down on the button toward the rear of the connector and disconnect it from the sensor.

Install a new sensor on the engine.

Push the connectors together until they lock.

Slide the locking tab to the lock position.

Use a wire tie to secure the sensor to the wiring harness. When possible, use the original factory sensor cradle to mount the sensor.

Secure the sensor so that:

• The connector is held securely to the harness and is not allowed to vibrate loose.
• The wire tie is not placed over the wires entering the rear of the connector; doing so can put excessive stress on the wires, seals, and wire crimps, which can cause damage.
• The sensing port, on the underside of the sensor, has adequate access to environmental conditions and is protected from events that could damage or plug the sensing port or sensing element. Damaging events include, but are not limited to, direct water spray, paint, harsh chemicals, and debris.
• The final placement of the sensor and wires are clear of moving parts and not in direct contact with surfaces that can abrade the wires.