DISC 8K0507 - Caterpillar

E021Conditions Which Generate This Code:The Electronic Control Module (ECM) detects a high exhaust temperature. Information on default settings and ranges for this event can be found in Troubleshooting, "Event Codes".System Response:The ECM will derate the engine's power. The event code will be logged.Possible Performance Effect:Loss of powerTroubleshooting:Probable causes for a high exhaust temperature
Aftercooler
Air inlet and exhaust system
Fuel injectors
Accessory equipmentTest Step 1. Check for the following Probable Causes
Normal inlet manifold pressure with high exhaust temperature can be caused by blockage of the fins of the aftercooler core.
Check the air inlet manifold pressure. 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.
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. Check that the injector trim codes have been entered. 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 the diagnostic functional test Troubleshooting, "Injector Solenoids".
Check all flywheel and damper driven equipment for proper operation. Ensure that the accessory equipment is not lugging down the engine. Expected Result:A problem was identified.Results:
OK - A problem was identified.Repair: Correct the problem.STOP