Table 92
Troubleshooting Test Steps
Values Results
1. Diagnostic Codes
Note: Certain diagnostic codes and/or event codes may cause
high fuel consumption.
A. Use the electronic service tool to check for active or logged
codes.
Diagnostic
codes
Result: A diagnostic code is present.
Repair: Troubleshoot the code and then verify that the fuel
consumption is normal.
Result: A diagnostic code is not present.
Proceed to Test Step 2.
2. Misreading of Fuel Level
Note: Misreading of the fuel gauge can give a false indication of
fuel consumption.
A. Monitor the fuel consumption over a period of 50 engine
hours.
Fuel level Result: Fuel consumption is normal for the operating
conditions.
Return the unit to service.
Result: Fuel consumption is high for the operating
conditions.
Proceed to Test Step 3.
3. Fuel Leakage
A. Check the engine for signs of fuel leakage.
Fuel leaks Result: Evidence of a fuel leak is found.
Repair: Repair or replace the component that is leaking
fuel.
Result: No evidence of a fuel leak is found.
Proceed to Test Step 4.
4. Fuel Quality
Note: The grade of the fuel affects the rate of fuel consumption.
Refer to the engines Operation and Maintenance Manual for ad-
ditional information.
Cold 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.
A. Check the fuel quality. Refer to Systems Operation, Testing,
and Adjusting, “Fuel Quality - Test”.
B. Refer to Operation and Maintenance Manual for information
on the proper characteristics of the fuel for the engine.
Fuel quality Result: The fuel quality does not meet specifications.
Repair: Drain the fuel system and replace the fuel filters.
Refer to the Operation and Maintenance Manual, “Fuel Sys-
tem Primary Filter (Water Separator) Element - Replace”
and Operation and Maintenance Manual, “Fuel System Fil-
ter - Replace”.
Fill the fuel system with fuel that meets the standard in the
Operation and Maintenance Manual, “Fluid
Recommendations”.
Prime the fuel system. Refer to the Operation and Mainte-
nance Manual, “Fuel System - Prime”.
Result: The fuel quality meets specifications.
Proceed to Test Step 5.
(continued)
UENR4469-36 187
Symptom Troubleshooting
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