High Altitude Derate Occurrence
Use this procedure in order to troubleshoot a high altitude derate or use this procedure if the following event code is active. Refer to Troubleshooting, "Event Codes" for information about event codes and the default trip point for this code. You must access the monitoring system on Caterpillar Electronic Technician (ET) in order to view the current trip point for this code.
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| Event Code | ||
|---|---|---|
| Code and Description | Conditions which Generate this Code | System Response |
| E009(2) High Altitude Derate | The Electronic Control Module (ECM) detects atmospheric pressure that is less than normal. | The engine is derated. The code is logged. |
- High altitude operation
- Atmospheric sensor
The engine is being operated at an altitude that is too high.
Check for any active diagnostic codes or logged diagnostic codes for the atmospheric sensor. If an active diagnostic code is present, refer to Troubleshooting, "Sensor Signal (Analog, Active) - Test".
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