SENSOR 4420469 - Caterpillar

The Engine Control Module (ECM) detects the following conditions:
The signal voltage from the engine oil pressure sensor is less than 0.2 VDC for more than eight seconds.
The ECM has been powered for at least two seconds.
The 168-01 Low ECM Battery Power is not active.
The 232-03 5 Volt Supply voltage high is not active.
The 232-04 5 Volt Supply voltage low is not active.
The engine is running or atmospheric pressure is greater than 80 kPa (12 psi).Note: Atmospheric pressures below 79 kPa (12 psi) may cause this code to become active only when the engine is running. This low atmospheric pressure causes the signal voltage to drop below the trip point of 0.2 VDC in a good circuit.Note: Elevations that are higher than 1900 m (6300 ft) will have atmospheric pressures that are below 79 kPa (12 psi).System Response:The ECM will log the diagnostic code and the ECM will trigger a snapshot. The check engine lamp will illuminate once this diagnostic code has been active for more than ten hours. The ECM will default to 600 kPa (88 psi) for engine oil pressure.Note: The engine oil pressure that is displayed on the Caterpillar Electronic Technician (ET) is the default value for engine oil pressure minus the atmospheric pressure.Possible Performance Effect:NoneTroubleshooting:Test Step 1. Perform the following diagnostic procedure: "Engine Pressure Sensor Open or Short Circuit - Test"Results:
OK - STOP