(Table 66, contd)
Troubleshooting Test Steps
Values Results
3. 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
Air and Exhaust
System
restrictions
Result: The air filter is restricted.
Repair: Replace the air filter.
Result: There are system restrictions.
Repair: Refer to Systems Operation/Testing and Adjusting,
“Air Inlet and Exhaust System” for additional information on
the air inlet and exhaust systems.
Result: The air intake and exhaust system is OK.
Proceed to Test Step 4.
4. Speed/Timing Sensors
A. Crank the engine and observe the engine speed on the elec-
tronic service tool status screen. Refer to Troubleshooting,
“Speed/Timing - Test” for additional information.
Upon initial cranking, the status for engine speed may indicate
that the engine speed signal is abnormal. This message will be
replaced with an engine speed once the ECM is able to calcu-
late a speed from the signal.
Speed/timing
sensor
Result: The speed/timing sensors are not operating
correctly.
Repair: Test the speed/timing sensors. Refer to Trouble-
shooting, “Speed/Timing - Test”.
Result: The speed/timing sensors are operating correctly.
Proceed to Test Step 5.
5. Low-Pressure Fuel System
A. Visually check the fuel tank for fuel.
Note: The fuel gauge may be faulty.
B. If the temperature is below 0 °C (32 °F), check for solidified
fuel (wax).
C. Check the primary filter/water separator for water in the fuel.
D. Check for fuel supply lines that are restricted or not correctly
installed.
E. Replace the in-line fuel filter that is installed upstream of the
Electric Fuel Lift Pump (EFLP).
F. Check that the EFLP is operating correctly.
G. Check for air in the fuel system and that the fuel system is
primed.
H. Check the diesel fuel for contamination. Refer to Systems
Operation, Testing, and Adjusting, “Fuel Quality - Test”.
Low-pressure
fuel system
Result: The fuel tank level is low.
Repair: Fill the fuel tank.
Result: The fuel contains solidified wax.
Repair: Replace the fuel with fuel of the correct specifica-
tion for the ambient conditions.
Result: There are fuel supply lines that are restricted or not
correctly installed.
Repair: Install the fuel lines correctly. Replace any dam-
aged or restricted fuel lines.
Replace the primary fuel filter and the secondary fuel filters.
Refer to the Operation and Maintenance Manual for further
information.
Result: The EFLP is not operating correctly.
Repair: Investigate the fault with the EFLP. Refer to Trou-
bleshooting, “Fuel Transfer Pump - Test”.
Result: There is air in the fuel system.
Repair: Prime the fuel system. Refer to Systems Opera-
tion, Testing, and Adjusting, “Fuel System - Prime”.
Result: The diesel fuel is contaminated.
(continued)
134 UENR4469-36
Symptom Troubleshooting
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