PIN 8K0393 - Caterpillar

Event E009Conditions Which Generate This Code:The Electronic Control Module (ECM) detects atmospheric pressure that is too low. Information on default settings and ranges for this event can be found in troubleshooting with an event code Troubleshooting, "Event Codes".System Response:The ECM will log the diagnostic event.Possible Performance Effect:E009-2 (Derate)
The engine will be derated.Troubleshooting:
The engine is being operated at an altitude that is too high.
There may be a problem with the atmospheric pressure sensor.Test Step 1. Check for Diagnostic Codes
Connect the Caterpillar Electronic Technician (ET) to the service tool connector.
Restore the electrical power to the ECM.
Check for any active diagnostic codes or logged diagnostic codes. Wait at least 30 seconds in order for the codes to become active. Expected Result:No diagnostic codes are present.Results:
OK - The engine is still derated. The engine is being operated at an altitude that is too high.STOP
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