CYLINDER BLOCK GP 8N3021 - Caterpillar

Which Generate This Code:The ECM detects all of the following conditions:
The inlet air restriction is at least 9.5 kPa (38 inch of H2O).
274-03 "Atmospheric Pressure open/short to +batt" is not active.
274-04 "Atmospheric Pressure short to ground" is not active.
275-03 "Right Turbo Inlet Pressure open/short to +batt" is not active.
275-04 "Right Turbo Inlet Pressure short to ground" is not active.System Response:The ECM will log the event.
Low power
There may be a problem with the air inlet system.
There may be a problem with one of the air inlet pressure sensors.Test Step 1. Check for Diagnostic Codes
Connect the electronic service tool to the service tool connector.
Turn the keyswitch to the ON position.
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. Check the Air Inlet System for Restrictions
Perform a check of the air inlet system. Inspect the air filter and the rest of the air inlet system for restrictions.Expected Result:There are no restrictions in the air inlet system.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.