Troubleshooting

Table 34
Troubleshooting Test Steps
Values Results
1. Diagnostic Codes
Note: Certain diagnostic codes and/or event codes may cause
poor performance. Refer to in the electronic service tool.
A. Use the electronic service tool to check for active or logged
codes.
Engine Derate
or Diagnostic
Codes
Result: A diagnostic code is present.
Troubleshoot the code. Refer to Troubleshooting, “Diagnostic
Trouble Codes”
Result: A diagnostic code is not present.
Proceed to Test Step 2.
2. Parameters in the Electronic Control Module (ECM)
A. Use the electronic service tool to verify that the correct pa-
rameters are being used. Refer to Troubleshooting, “Configu-
ration Parameters” for additional information.
Parameters Result: The parameters are not correct.
Input the correct parameters. Refer to Troubleshooting, “Con-
figuration Parameters” for additional information.
Result: The parameters are correct.
Proceed to Test Step 3.
3. Air Intake and Exhaust System
A. Check the air filter restriction indicator, if equipped. Replace
a plugged air filters. Refer to the Operation and Maintenance
Manual.
B. Check the air inlet and exhaust system for restrictions and/
or leaks. Refer to Systems Operation, Testing and Adjusting,
“Air Inlet and Exhaust System - Inspect”
Restrictions Result: There are restrictions in the air inlet or exhaust
system.
Make the necessary repairs, Refer to Systems Operation/
Testing and Adjusting, “Air Inlet and Exhaust System - In-
spect” for additional information.
Result: There are no restrictions in the air inlet or exhaust
system.
Proceed to Test Step 4.
4. Valve Lash
A. Check the valve lash. Refer to Systems Operation, Testing,
and Adjusting, “Engine Valve Lash - Inspect/Adjust”.
Valve lash Result: The valve lash is not set correctly.
Set the valve lash. Refer to Systems Operation, Testing, and
Adjusting, “Engine Valve Lash - Inspect/Adjust” for the correct
procedure.
Result: The valve lash is correct.
Proceed to Test Step 5.
(continued)
UENR0612-07 83
Symptom Troubleshooting
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