3500B Engines for 5130B and 5230B Excavators E039 Low Engine Oil Pressure Derate Caterpillar

Conditions Which Generate This Code:

The ECM detects all of the following conditions:

• The engine has been running for at least 10 seconds after engine speed is within 50 rpm of low idle.

• Engine oil pressure is below the trip line in Illustration 1 for 2 seconds.

• 100-03 "Engine Oil Pressure open/short to +batt" is not active.

• 100-04 "Engine Oil Pressure short to ground" is not active.

Illustration 1	g00816254

System Response:

The ECM will log the event. The ECM derates the value for the Full Torque Setting of the engine by 15 percent.

• Low power

• 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 Diagnostic Codes.

1. Connect ET to the service tool connector.

2. Turn the keyswitch to the ON position.

3. Check for any Active Diagnostic Codes or Logged Diagnostic Codes.

Expected Result:

There should be 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.

  Stop.

Test Step 2. Perform a Check of the Engine Lubrication System.

1. Perform a check of the engine lubrication system. Refer to Troubleshooting, "Low Engine Oil Pressure".

Expected Result:

There should be no problems with engine oil pressure.

Results:

• 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.

• Not OK - There are problems with engine oil pressure.

  Repair: Repair the problem. Ensure that the repair eliminates the problem.

  Stop.