3456 Engine, 836G Landfill Compactor, 834G Wheel Dozer and 988G Wheel Loader Caterpillar

The ECM detects all of the following conditions:

• The engine has been running for at least 10 seconds.

• Engine oil pressure is below the trip line in Illustration 1 for at least 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	g00755458

System Response:

The ECM will log the warning.

Possible Performance Effect:

• Low power

Troubleshooting:

• 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 - Proceed to Test Step 2.

• Not OK -

  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 are no problems with engine oil pressure.

Results:

• OK - 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 -

  Repair: Repair the problem.

  Ensure that the repair eliminates the problem.

  STOP