
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.
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 connec-
tors. Check for correct installation of the fuel injector connectors.
Connectors
Result:
There are suspect connectors.
Repair connectors that are suspect or replace connectors
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 in order to confirm that the correct fuel is
being used for the engine. Refer to Systems Operation/Testing and
Adjusting, “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 engine.
If necessary,
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 rocker
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 S-O-S 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.
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)
UENR0612
65
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