TUBE 3617826 - Caterpillar

The Electronic Control Module (ECM) detects an excessive exhaust temperature for the engine at the "REAR RIGHT EXHAUST TC". This sensor is located in the exhaust manifold below the turbocharger. This sensor measures the exhaust gas temperature for cylinders 8, 10, and 12. Information on default settings and ranges for this event can be found in Troubleshooting, "Event Codes".System Response:The event code will be logged.Possible Performance Effect:E776(1)
There are no performance effects.E776(2)
The engine power will be derated.Troubleshooting:High exhaust temperature can be caused by problems with the following.
Diagnostic codes
Air inlet and exhaust system
Fuel injectors
Aftercooler (if applicable)
Exhaust temperature sensorTest Step 1. Check for Diagnostic CodesConnect Cat ET and check for active and/or logged diagnostic codes. Troubleshoot any active diagnostic codes before continuing with this procedure.Results:
OK - There are no active diagnostic codes. Proceed to Test Step 2.
Not OK - There are active diagnostic codes. Resolve any active diagnostic codes before proceeding to Test Step 2.Test Step 2. Inspect the Air Inlet and Exhaust SystemCheck 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.Results:
OK - There are no problems with the air inlet and exhaust system. Proceed to Test Step 3.
Not OK - A problem has been identified with the air inlet or the exhaust system.Repair: Resolve the problem and verify if the E776 code has been eliminated.STOPTest Step 3. Check for Faults with the Fuel InjectorsFaulty 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".Results:
OK - There are no problems with the fuel injectors. Proceed to Test Step 4.
Not OK - A problem has been identified with the fuel injectors.Repair: Resolve the problem and verify if the E776 code has been eliminated.STOPTest Step 4. Inspect the Aftercooler (if applicable)Normal intake manifold pressure with high exhaust temperature can be caused by blockage in the aftercooler.If the application has an aftercooler, check the aftercooler for correct operation. Check for blockage in the cores of the aftercooler.Results:
OK - There is no problem with the aftercooler. Proceed to Test Step 5.
Not OK - A problem has been identified with the aftercooler.Repair: Resolve the problem and verify if the E776 code has been eliminated.STOPTest Step 5. Check the Exhaust Temperature SensorUse Cat ET to check the status of the exhaust temperature.
Start the engine.
Use Cat ET to monitor the status of the exhaust temperature while the engine is warming to operating temperature.
Ensure that the reading that is displayed is reasonable. Results:
The temperature indicated by the sensor is not within