
Table 28
Troubleshooting Test Steps
Values
Results
1. Diagnostic Codes
A. Establish communication between the electronic service tool
and the Electronic Control Module (ECM). Refer to Troubleshoot-
ing, “Electronic Service Tools”, if necessary.
Diagnostic
codes
Result:
There are active codes.
Troubleshoot any active codes before continuing with this
procedure.
Result:
There are no active codes.
Proceed to Test Step 2.
2. Air Intake and Exhaust System
A. Check the air filter restriction indicator.
B. Ensure that the air filter is clean and serviceable
C. Check the air intake and exhaust systems for the following
defects:
·
Blockages
·
Restrictions
·
Damage to lines or hoses
Fuel System
Result:
A defect was found in the air intake or exhaust
system.
Make any necessary repairs.
Result:
No defects found in the air intake or exhaust
systems.
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 Oper-
ation, Testing, and Adjusting, “Fuel System Pressure - Test”
F. Check the diesel fuel for contamination. Refer to Systems Oper-
ation, 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 supply
Result:
A defect was found in the fuel system.
Make any necessary repairs.
Result:
No defects found.
Proceed to Test Step 4.
(continued)
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UENR0612
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