Table 91
Troubleshooting Test Steps
Values Results
1. Check for Inlet System Leakage
A. Apply a light load to the engine and check for leakage from the
inlet system downstream of the low-pressure turbocharger.
Boost leaks Result: Leakage was found.
Repair: Repair the leaks. Return the unit to service.
Result: Leakage was not found.
Proceed to Test Step 2.
2. Check the Engine Operating Conditions
A. Use the electronic service tool to check the histograms. Use
the histograms to determine if the high exhaust temperature was
due to normal operation.
If possible, interview the operator. Determine if the engine is
being operated under heavy load. Ensure that the engine is being
operated at an acceptable engine speed.
If derates are suspected, reset the histogram and return the unit
to service. If the histogram repopulates without fault codes, the
derating of the engine was under normal engine operation.
Normal
operation
Result: The code was logged during a heavy load.
Repair: Reduce the load on the engine. Return the unit to
service.
Result: The code was not logged during a heavy load.
Proceed to Test Step 3.
3. Check the Exhaust Back Pressure Regulator (EBPR)
A. Check the EBPR for correct operation. Refer to Troubleshoot-
ing, “Motorized Valve - Test” for the correct troubleshooting
procedure.
Note: An EBPR that has failed in the closed position can cause
high exhaust temperatures.
Failed exhaust
back pressure
regulator
Result: The exhaust back pressure regulator has failed.
Repair: Repair or replace the valve. Return the unit to
service.
Result: The exhaust back pressure regulator has not failed.
Proceed to Test Step 4.
4. Check the Engine Operating Altitude
A. Check the engine operating altitude.
Note: High altitudes can cause high exhaust temperatures, con-
sider the operational altitude when troubleshooting a high exhaust
temperature. High exhaust temperatures are associated with high
operational altitudes.
When operating below 5500ft and the ambient temperature is be-
low 30° C (85° F), altitude should not cause a high exhaust tem-
perature derate.
High opera-
tional altitudes
Result: The engine was operating at high altitudes.
The high exhaust temperature was due to high altitudes.
Return the unit to service.
Result: The engine was not operating at high altitudes.
Proceed to Test Step 5.
5. Check for an Obstructed Air-to-Air Aftercooler (ATAAC)
A. The intake manifold air temperature can increase if the flow
through the ATAAC is obstructed. Check the ATAAC for obstruc-
tions or debris. Ensure that the flow of air or coolant through the
ATAAC is adequate.
Obstructed
aftercooler
Result: The engine ATAAC was obstructed.
Repair: Clear any obstructions. Return the unit to service.
If the procedure did not correct the issue, contact the Dealer
Solutions Network (DSN).
UENR4469-36 185
Symptom Troubleshooting
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