| Event Code | ||
|---|---|---|
| Description | Default Conditions which Generate this Code | System Response |
| E099(1) Engine Oil Filter Restriction Warning | The difference between the filtered oil pressure and the unfiltered oil pressure is greater than the trip point pressure. | The code is logged. |
- Plugged oil filter or faulty oil filter
- Faulty oil pressure sensor and/or circuit
- Malfunctioning of the oil filter bypass valve
Check the oil filter differential pressure. If the oil filter differential pressure is too high, change the oil filter elements.
Inspect the oil filters for good condition. Replace any suspect oil filter.
Check the Oil Pressure Sensors and/or Circuits
Use Caterpillar Electronic Technician (ET) to compare the readings of the filtered oil pressure and the unfiltered oil pressure while the engine is OFF. If the readings are not approximately zero for both of the sensors, troubleshoot the sensor circuit(s). Refer to Troubleshooting, "Sensor Signal (Analog, Active) - Test". Make sure that the sensors are correctly wired.
Check the Oil Filter Bypass Valve
An oil filter bypass valve that is stuck in the closed position can cause a high reading for differential pressure when the oil is cold. An oil filter bypass valve that is stuck in the open position can cause a low reading for differential pressure when the oil is hot. Check the operation of the oil filter bypass valve.
If the oil filter bypass valve is faulty, repair the valve, when possible. Replace the valve, if necessary.