Troubleshooting

Table 31
Troubleshooting Test Steps
Values Results
1. Diagnostic Codes
A. Establish communication between the electronic service tool and
the Electronic Control Module (ECM) . Refer to Troubleshooting,
“Electronic Service Tools”, if necessary.
B. Check if any codes are active or logged.
Diagnostic
code
Result: A code is active or logged.
Repair: Troubleshoot any codes before continuing with
this procedure.
Result: A code is not active or logged.
Proceed to Test Step 2.
2. Accessory Equipment
A. Check all accessory equipment for faults that may create exces-
sive load on the engine.
Accessories Result: An engine accessory is creating an excessive
load.
Repair: Repair or replace the engine accessory.
Result: An engine accessory is not creating an exces-
sive load.
Proceed to Test Step 3.
3. Fuel System Inspection
A. Check that the fuel shut-off valve is in the OPEN position.
B. If the temperature is below 0 °C (32 °F), check for solidified fuel
(wax).
C. Check for fuel supply lines that are restricted.
D. Check that the low-pressure fuel lines are correctly installed.
E. Check the pressures in the fuel system. Refer to Systems Opera-
tion, Testing, and Adjusting, “Fuel System Pressure - Test”
F. Check the diesel fuel for contamination. Refer to Systems Opera-
tion, Testing, and Adjusting, “Fuel Quality - Test”.
G. Check for air in the fuel system. Refer to Systems Operation,
Testing, and Adjusting, “Air in Fuel - Test”.
H. Ensure that the fuel system has been primed. Refer to Systems
Operation, Testing, and Adjusting, “Fuel System - Prime”.
Fuel System Result: A defect was found in the fuel system.
Repair: Make any necessary repairs.
Result: No defects found.
Proceed to Test Step 4.
(continued)
76 UENR0612-07
Symptom Troubleshooting
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