BREATHER AS 4W3027 - Caterpillar

Event E100Conditions Which Generate This Code:The Electronic Control Module (ECM) detects all of the following conditions:
The engine has been running for at least ten seconds after engine speed is within 50 rpm of low idle.
Engine oil pressure is low for four seconds.
100-03 "Engine Oil Pressure open/short to +batt" is not active.
100-04 "Engine Oil Pressure short to ground" is not active.System Response:The ECM will log the event.Possible Performance Effect:
NoneTroubleshooting:
There may be a problem with the engine lubrication system.
There may be a problem with the engine oil pressure sensor.Test Step 1. Check for "ACTIVE" Diagnostic Codes
Start the Caterpillar Electronic Technician (ET).
Turn the keyswitch to the ON position.
Check for any active diagnostic codes or logged diagnostic codes. Expected Result:There are no diagnostic codes that are present.Results:
OK - There are no diagnostic codes that are present. Proceed to Test Step 2.
Not OK - There are diagnostic codes that are present.Repair: Repair the diagnostic codes that are present. Refer to the appropriate topic in the "Troubleshooting With a Diagnostic Code" section of this manual. Ensure that the repair eliminates the problem.STOPTest Step 2. Perform a Check of the Engine Lubrication System
Perform a check of the engine lubrication system. Refer to the diagnostic procedure Troubleshooting, "Low Engine Oil Pressure". Expected Result:There are problems with engine oil pressure.Results:
OK - There are problems with engine oil pressure.Repair: Repair the problem. Ensure that the repair eliminates the problem.STOP
Not OK - There are no problems with engine oil pressure. There may be an intermittent problem.Repair: Monitor the operation of the engine. Repair the problem. Ensure that the repair eliminates the problem.STOP