The inlet air system has exceeded the derate trip point for overtemperature protection.
System Response:
The Electronic Control Module (ECM) will log the event.
Caterpillar Electronic Technician (ET) displays "Engine Derate" on the status screen.
The ECM will derate engine power by three percent for an inlet air temperature of 80 °C (176 °F). The ECM will continue to derate engine power by an additional three percent for each 1 °C (2 °F) that is beyond the trip point. The ECM will derate engine power for a maximum of 20 percent. The engine power will be derated at a rate of one percent per second.
The derate will be cancelled if the inlet air temperature drops below 79 °C (174 °F) for 20 seconds.
Test Step 1. Check the Monitoring System Parameter
The "High Intake Air Temperature" parameter may be incorrectly programmed. Use Cat ET to view the parameter setting for "High Intake Air Temperature". Ensure that the parameter setting is correct for the application of the engine.
Expected Result:
The "High Intake Air Temperature" parameter is programmed correctly.
Results:
- OK - There is a problem with the air inlet or the exhaust system.
Repair: Refer to Systems Operation/Testing and Adjusting, "Air Inlet and Exhaust System".
STOP
- Not OK - The parameter is incorrectly programmed.
Repair: Refer to Troubleshooting, "System Configuration Parameters" for the temperature range that is available for the "High Intake Air Temperature" parameter. Verify that the repair eliminates the problem.
STOP