PLATE 1741524 - Caterpillar

Use this procedure in order to troubleshoot an abnormal oil pressure differential. Also. use this procedure if one of the following engine events is active. Refer to Troubleshooting, "Diagnostic Trouble Codes" for information about engine events. Access the engine monitoring system on Caterpillar Electronic Technician (ET) in order to view the current trip points for these codes. For information on the engine monitoring system, refer to Systems Operation, "Engine Monitoring System".
Table 1
Engine Events
J1939 Code and Description Conditions which Activate the Code System Response
99-0 Engine Oil Filter Differential Pressure : High - most severe (3) The difference in oil pressure between the inlet and the outlet of the oil filters has exceeded the trip point for the programmed delay time. The code is logged.
The alarm output is activated.
99-15 Engine Oil Filter Differential Pressure : High - least severe (1) The code is logged.
The alarm output is activated.
The shutdown output is activated.
The engine is shut down.
99-1 Engine Oil Filter Differential Pressure : Low - most severe (3) The difference in oil pressure between the inlet and outlet of the oil filters has fallen below the trip point for the programmed delay time. The code is logged.
The alarm output is activated.
99-17 Engine Oil Filter Differential Pressure : Low - least severe (1) The code is logged.
The alarm output is activated.
The shutdown output is activated.
The engine is shut down. Probable Causes
Plugged oil filter or faulty oil filter
Oil pressure sensors and/or circuits
Faulty oil filter bypass valveRecommended Actions
Plugged Oil Filter or Faulty Oil Filter
Check the oil filter differential pressure. Do not allow the differential pressure to exceed 103 kPa (15 psi). If the oil filter differential pressure is too high, change the oil filter elements.Inspect the oil filters for good condition. Suspect a problem with an oil filter if there is visible external damage to the filter housing. Replace any suspect oil filter.Oil Pressure Sensors and/or Circuits
Use Cat ET to compare the status of the "Engine Oil Pressure" parameter and the "Pre-filter Oil Pressure" parameter while the engine is off. Ensure that the sensors are correctly wired.If the difference between the sensors is not approximately zero, troubleshoot the sensor circuits. Refer to Troubleshooting, "Sensor Signal (Analog, Active) - Test".Faulty 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. For more information, refer to Systems Operation/Testing and Adjusting, "Engine Oil Pressure - Test".If the proper operation of the oil filter bypass valve is suspect, repair the valve, when possible. Replace the valve, if necessary.