| Event Code | ||
|---|---|---|
| Description | Default Conditions which Generate this Code | System Response |
| E021(2) High Exhaust Temperature Derate | The exhaust temperature is above the trip point temperature. | The engine is derated. The code is logged. |
| E173(1) High Exhaust Temperature Warning | The code is logged. | |
- Air inlet and exhaust system
- Fuel injectors
- Aftercooler (if applicable)
- Accessory equipment
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 Caterpillar Electronic Technician (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 Solenoids".
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.
Check all flywheel and damper driven equipment for proper operation. Ensure that the accessory equipment is not lugging down the engine.