| Event Code | ||
|---|---|---|
| Code and Description | Conditions which Generate this Code | System Response |
| E173(1) High Exhaust Temperature Warning | The exhaust temperature is above the trip point temperature. | The code is logged. |
| E021(2) High Exhaust Temperature Derate | The engine is derated. The code is logged. | |
- Diagnostic codes
- Air inlet and exhaust system
- Fuel injectors
- Aftercooler (if applicable)
Connect Cat ET and check for active and/or logged diagnostic codes. Troubleshoot any active diagnostic codes before continuing with this procedure.
Check for air inlet restrictions and/or leaks. A one degree increase in the inlet manifold temperature will increase the exhaust temperature by approximately three degrees. Check for leaks between the exhaust manifold and the turbocharger. Check for exhaust restrictions. Refer to the Systems Operation/Testing and Adjusting manual for more information on inspecting the air inlet and exhaust system.
Faulty injectors that deliver too much fuel will increase exhaust temperatures. Connect Cat ET in order to determine if any diagnostic codes for the injector solenoids are present. Perform the "Injector Solenoid Test". Observe that the injector solenoids are being energized on Cat ET. Perform the "Cylinder Cutout Test". Locate the misfiring cylinder. Refer to Troubleshooting, "Injector Solenoid - Test".
Normal intake manifold pressure with high exhaust temperature can be caused by blockage of the fins of the aftercooler core.
If the application has an aftercooler, check the aftercooler for correct operation. Check for blockage in the cores of the aftercooler.