0350965 JOHNSON EXHAUST HOUSING, Outer

Table 1
Event Code    
Code    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.    Probable Causes
Diagnostic codes
Air inlet and exhaust system
Boost pressure below normal
Fuel supply or fuel pressure
Differential exhaust temperature is too high
Aftercooler
Valve adjustment
Accessory equipment
TurbochargerRecommended Actions
Diagnostic Codes
Connect Cat ET in order to determine if any diagnostic codes for the injector solenoids are present. Check for an active 1495-2 Injector Trim Codes Not Programmed diagnostic code. Repair any active diagnostic codes.Perform the "Injector Solenoid Test". Observe that the injector solenoids are being energized on Cat ET. Listen for an audible click at the valve covers as each injector is energized.Perform the "Cylinder Cutout Test". Analyze the data in order to determine if one of the injectors is misfiring. Refer to Troubleshooting, "Injector Solenoids".Air Inlet and Exhaust System
Check the air inlet manifold pressure. Use a VIMS boost trend to aid in this diagnosis. Check for air inlet restrictions and/or leaks. Refer to the Systems Operation/Testing and Adjusting manual for more information. Refer to Service Magazine, SEPD0712, "Procedure to Test the Air Induction System".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.Boost Pressure Below Normal
Refer to Troubleshooting, "Boost Pressure Below Normal".Fuel Supply or Fuel Pressure
Check the fuel level in the fuel tank. Ensure that adequate fuel is available for the application.Check the fuel lines for restrictions and for collapsed lines or pinched lines. Repair the lines and/or replace the lines.Check the fuel tank for foreign objects which may block the fuel supply. Check for air leaks in the suction line of the fuel pump. Prime the fuel supply system if any of the following procedures have been performed:
Replacement of the fuel filters
Service on the low-pressure fuel supply circuit
Replacement of unit injectorsCold weather adversely affects the characteristics of the fuel. Refer to the Operation and Maintenance Manual for information on improving the characteristics of the fuel during cold-weather operation.Check the fuel pressure during engine operation. Check the fuel pressure after the fuel filter. Refer to the Systems Operation/Testing and Adjusting manual for the correct pressure values. If the fuel pressure is low, replace the fuel filters. If the fuel pressure is still low, check the following items: fuel transfer pump, fuel transfer pump coupling and fuel pressure regulating valve.Differential Exhaust Temperature Is Too High
Perform the torque converter stall speed check. Refer to Systems Operation/Testing and Adjusting, "Torque Converter" manual for the power train.Perform the "Cylinder Cutout Test". Analyze the data in order to determine if one of the injectors is misfiring. Refer to Troubleshooting, "Injector Solenoids".Normal intake manifold pressure with a high exhaust temperature can be caused by blockage of the fins of the aftercooler core. Check the aftercooler for correct operation. Check for blockage in the cores of the aftercooler.Aftercooler
Normal intake manifold pressure with a high exhaust temperature can be caused by blockage of the fins of the aftercooler core. Check the aftercooler for correct operation. Check for blockage in the cores of the aftercooler.Valve Adjustment
Ensure that the valve lash and valve bridge adjustment is correct. Refer to Systems Operation/Testing and Adjusting, "Valve Lash Check" and Systems Operation/Testing and Adjusting, "Valve Lash and Valve Bridge Adjustment".Accessory Equipment
Check all flywheel and damper driven equipment for proper operation. Ensure that the accessory equipment is not lugging down the engine.Turbocharger
Check the turbocharger for free operation and for excessive motion in the shaft of the turbocharger.
Examine the turbocharger for potential causes of failure.
If there is any damage to the turbine wheel, examine the exhaust system and the exhaust manifold to ensure that no foreign material remains.
If there is any damage to the compressor wheel, examine the air cleaner, the aftercooler, and the ducting to ensure that no foreign material remains.
If there is any sign of oil on the compressor side, inspect the accumulator/oil separator and the aftercooler.