GOVERNOR AS-AIR COMPRESSOR 4N9681 - Caterpillar

Event E009Conditions Which Generate This Code:The Electronic Control Module (ECM) detects atmospheric pressure that is less than 70 kPaSystem Response:The event is logged. The ECM limits the fuel above the default altitude of 762 m (2500 ft). The ECM will derate the engine in 3 percent increments for every 305 m (1000 ft) increase in elevation up to a maximum derate of 35 percent.Possible Performance Effect:
Low powerTroubleshooting:
The engine is being operated at an altitude over 762 m (2500 ft) above sea level.
There may be a problem with the atmospheric pressure sensor.Test Step 1. Check for "ACTIVE" Diagnostic Codes.
Start the Caterpillar Electronic Technician (ET).
Turn the main power to the ON position.
Check for any active diagnostic codes or logged diagnostic codes. Expected Result:No diagnostic codes are present.Results:
OK - No diagnostic codes are present. The engine is still derated.Repair: The engine is being operated at an altitude in excess of 762 m (2500 ft) above sea level.STOP
Not OK - Diagnostic codes 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