PACCAR PX-8 CM2150 (2007-09) Fault Code: 2273 PID: 411 SPN: 411 FMI: 3 Exhaust Gas Recirculation Valve Delta Pressure Sensor Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage detected at the EGR differential pressure sensor circuit.
Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe® Online for applicable fixes to the calibration stored in the ECM. If necessary, recalibrate the ECM.
Possible causes:
1)An open return circuit in the engine harness, connectors, or sensor
2)A signal wire shorted to sensor supply or battery voltage
3)A damaged EGR differential pressure sensor.
Possible repairs:
1)Replace the EGR valve delta pressure sensor.
2)Repair or replace the engine harness.
3)Replace the ECM.
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