Troubleshooting

Table 27
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.
Repair: Troubleshoot any active codes before continuing
with this procedure.
Result: There are no active codes.
Proceed to Test Step 2.
2. Electrical Connections
A. Check for the correct installation of the ECM P1 and P2 con-
nectors. Check for correct installation of the fuel injector
connectors.
Connectors Result: There are suspect connectors.
Repair: Repair connectors that are suspect or replace con-
nectors that are suspect.
Perform the “Wiggle Test” on the electronic service tool
Result: There are no suspect connectors.
Proceed to Test Step 3.
3. Fuel Quality
A. Obtain a fuel analysis to confirm that the correct fuel is being
used for the engine. Refer to Systems Operation/Testing and Ad-
justing, “Fuel System Quality Test” for the proper procedure.
Fuel Result: The fuel quality is not OK.
Note: Refer to Operation and Maintenance Manual for infor-
mation on the proper characteristics of the fuel for the en-
gine. If necessary,
Repair: Replace the fuel. Verify that the repair eliminated
the noise.
Result: The fuel quality is OK.
Proceed to Test Step 4.
4. Correct Lubrication
A. Check for correct lubrication of the valve components. Check
for sufficient lubrication between the injector tappets and the rock-
er arms.
B. Check for blocked oil passages. Oil passages must be clean.
Clean any oil passages that are questionable. Refer to the Disas-
sembly and Assembly for additional information.
C. Inspect the engine oil filters for ferrous material.
D. Obtain an oil analysis. The analysis will contribute to a better
understanding of oil contamination and the origin of the
contamination.
Lubrication Result: The oil passages are blocked or the engine does
not have correct lubrication.
Repair: Make the necessary repairs, Verify that the repair
eliminated the noise.
Result: The oil passages are not blocked and the engine
has proper lubrication.
Proceed to Test Step 5.
(continued)
68 UENR0612-07
Symptom Troubleshooting
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