BREATHER 1577911 - Caterpillar

Use this procedure in order to troubleshoot low engine oil pressure. Or, use this procedure if one of the following event codes is active.
Table 1
Event Codes
J1939 Code and Description Conditions which Generate this Code System Response
100-15 Engine Oil Pressure : Low - least severe (1) The engine oil pressure is below the trip point and the delay time has expired. The code is logged.
The ECM may derate the engine or shutdown the engine.
100-0 Engine Oil Pressure : High - most severe (3) Probable Causes
Associated code
Low engine oil level
Aeration in the oil
Low oil viscosity
Plugged Oil Filter
Faulty oil pump
Faulty engine oil pressure sensor
Faulty bypass valve
Damaged suction tube or cracked suction tube
Excessive wear of engine componentsRecommended Actions
Note: The procedures have been listed in order of probability. Complete the procedures in the order of the listed test steps.
Table 2
Troubleshooting Test Steps Values Results
1. Active Codes and Logged Codes
A. Establish communication between Caterpillar Electronic Technician (ET) and the Electronic Control Module (ECM).
B. Monitor the diagnostic codes on Cat ET. Check for active or logged diagnostic codes. Specifically check for codes that could be associated to low oil pressure. Refer to the histogram information for engine derates in Cat ET.
Note: Wait at least 30 seconds in order for diagnostic codes to become active.
C. If the histograms contain derates and no diagnostic codes are present, then the engine is operating normally.
Codes
Result: A diagnostic code is present.
Repair: Troubleshoot any codes before continuing with this procedure.
Verify that the repair eliminated the problem.
Reset the histogram.
Result: A diagnostic code is not present.
Proceed to Test Step 2.
2. Engine Oil Level
A. Check the engine oil level in the crankcase. Refer to the Operation and Maintenance Manual for calibration of the dipstick gauge. The oil level can possibly be too far below the oil pump supply tube. The oil pump cannot supply enough lubrication to the engine components.
Oil
Result: The engine oil level is low.
Repair: Add engine oil in order to obtain the correct engine oil level. Refer to Operation and Maintenance Manual, "Engine Oil" for the recommendations of engine oil.
Start the engine. Inspect the exterior of the engine for oil leaks. Repair any oil leaks.
Verify that the repair eliminated the problem.
Result: The engine oil is not low.
Proceed to Test Step 3.
3. Aerated Oil
A. Sample the engine oil for aeration.
Foamy oil on the dipstick is a good indication of aeration.
Aeration
Result: The oil is aerated.
Proceed to Test Step 9.
Result: The oil is not aerated.
Proceed to Test Step 4.
4. Oil Viscosity
A. Sample the engine oil viscosity. Obtain an S O S Oil Analysis to determine the characteristics of the oil.
B. Access the "Cylinder Cutout Test" in the "Diagnostic Tests" under the "Diagnostics" menu.
C. Perform the "Automatic Cylinder Cutout Test" on Cat ET.
Oil viscosity
Result: The oil viscosity is not correct.
Repair: Replace the engine oil. Refer to Operation and Maintenance Manual, "Engine Oil" for the recommendations of engine oil.
Verify that the repair eliminated the problem.
Result: The oil viscosity is correct.
Proceed to Test Step 5.
5. Oil Filter
A. Replace the engine oil filter.
Filter
Result: Replace the engine oil filter.
Repair: The