13330A 3 Force BULB ASSEMBLY-PRIMER

Recommended Actions
Note: The procedures have been listed in order of probability. Complete the procedures in order.
Table 1
Troubleshooting Test Steps Values Results
1. Diagnostic Codes
Note: Certain diagnostic codes and/or event codes indicate the cause of 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 diagnostic code and then verify that the fuel consumption is normal. Refer to Troubleshooting, "Diagnostic Trouble Codes".
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 additional 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 System Primary Filter (Water Separator) Element - Replace" and Operation and Maintenance Manual, "Fuel System Filter - 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 Maintenance Manual, "Fuel System - Prime".
Result: The fuel quality meets specifications.
Proceed to Test Step 5.
5. Quality of Oil
Note: The nominal viscosity of the lubricating oil that is used in the engine will affect the rate of fuel consumption. The viscosity of lubricating oil is defined by the SAE grade of the lubricating oil. The grade of the lubricating oil must be correct for the ambient conditions. Lubricating oil for high ambient temperatures will affect fuel consumption in cold ambient temperatures.
A. Check that the engine oil meets the required specification. Refer to "Engine Oil" in the Operation and Maintenance Manual, "Refill Capacities".
Engine oil quality
Result: The engine oil does not meet the required specification.
Repair: Refill the oil system with oil of an acceptable quality. Refer to the applicable sections in the Operation and Maintenance Manual.
Result: The engine oil meets the required specification.
Proceed to Test Step 6.
6. Engine Accessories and Transmission
A. Check that the engine accessories and transmission are operating correctly.
B. Remove and inspect any engine accessories that may be adding unexpected load to the engine.
Engine accessories and transmission
Result: The engine accessories and transmission are not OK.
Repair: Make the necessary repairs.
Result: The engine accessories and transmission are OK.
Proceed to Test Step 7.
7. Coolant Temperature
Note: The operating temperature of the engine will affect the rate of fuel consumption. Operation of the engine below the correct temperature will increase fuel consumption. Failure of the water temperature regulator can prevent the engine from operating at the correct temperature.
A. Check that the water temperature regulator is operating correctly. Refer to Systems Operation, Testing, and Adjusting, "Water Temperature Regulator - Test".
Coolant temperature
Result: The water temperature regulator is not operating correctly.
Repair: Replace the water temperature regulator. Verify that the repair corrected the fault.
Result: The water temperature regulator is operating correctly.
Proceed to Test Step 8.
8. Prolonged Operation at Idle Speed
Note: Prolonged operation of the engine at idle speed increases fuel consumption.
A. Check for extended periods of engine operation at idle speed.
Extended idle operation
Result: The engine is operating at idle speed for extended periods.
Repair: When possible, stop the engine to conserve fuel.
Result: The engine is not operating at idle speed for extended periods.
Proceed to Test Step 9.
9. Engine Operating Speed
The operating speed of the engine will affect the rate of fuel consumption.
High engine speed will increase fuel consumption. At high engine speeds, internal power losses in the engine increase and more power is required to drive the alternator and the fan. These losses of power increase fuel consumption.
Lugging down the engine to a low engine speed will increase fuel consumption. At low engine speeds, the combustion efficiency of the engine is reduced and more fuel is required.
A. Check that the engine has been operated at a suitable engine speed.
Engine speed
Result: The engine has been operated at an unsuitable speed.
Operate the engine at a suitable speed.
Result: The engine has been operated at a suitable speed.
Proceed to Test Step 10.
10. Air Intake and Exhaust System
A. Check the air filter restriction indicator, if equipped.
B. Check the air intake and exhaust systems for the following defects:
Blockages
Restrictions
Damage to lines or hoses
Refer to Systems Operation, Testing and Adjusting, "Air Inlet and Exhaust System - Inspect".
Air and Exhaust System restrictions
Result: The air filter is restricted.
Repair: Replace the air filter.
Result: There are system restrictions.
Repair: Repair any defects in the air inlet and exhaust systems.
Result: The air intake and exhaust system is OK.
Proceed to Test Step 11.
11. Cooling Fan
Excessive operation of the cooling fan will increase fuel consumption.
A. Check the operation of the cooling fan.
Cooling fan
Result: The cooling fan is operating excessively.
Repair: Repair or replace the faulty cooling fan components.
Result: The cooling fan is not operating excessively.
Proceed to Test Step 12.
12. Reduced Pressure of Intake Air
Note: If the air pressure is lower than normal, the same power can only be achieved by the following:
Higher engine speed
Injection of more fuel
Either of these conditions will increase the fuel consumption.
A. Check all pipes from the outlets of the turbocharger compressor to the inlet manifold for leaks.
B. Check for the correct operation of the wastegate in the turbocharger. Refer to Systems Operation, Testing and Adjusting,