CM870 and ISX Engines – 019-370   EGR Differential Pressure Sensor

Disconnect the wiring harness connector.

Remove the mounting capscrews.

Remove the sensor.

Clean the exhaust gas recirculation (EGR) differential pressure sensor and adapter mounting surfaces. Remove any dirt build-up or soot residue.

Inspect the EGR differential sensor bracket for cracks or fretting. If damage is present, the sensor must be replaced. The bracket itself is not a serviceable component.

Inspect the o-rings for cracks or damage. Replace the o-rings if cracks or damage is found.

Install the EGR differential pressure sensor. Make sure the rectangular seals are captured in the bottom of the sensor.

Connect the wiring harness to the sensor.

Make sure the sensor is installed correctly. Verify the plus symbol on the side of the EGR differential pressure sensor is on the same side as the word HI cast into the adapter. Likewise, verify the negative symbol, on the opposite side of the sensor, is on the same side as the word REF cast into the adapter.

Start the engine and verify proper operation (no fault codes).

NOTE: An active EGR differential pressure sensor fault code requires a certain procedure, once the repair is complete, to get the fault code to go inactive. The engine must be started and the engine coolant temperature must be above 68°C [154°F] and the intake manifold air temperature must be above 7°C [45°F]. Shut the keyswitch off for 30 seconds and turn the keyswitch back on. The fault code will then transition to inactive.