(Table 32, contd)
Troubleshooting Test Steps
Values Results
4. Low Compression (Cylinder Pressure)
A. Perform a compression test. Refer to Systems Operation, Test-
ing, and Adjusting, “Compression - Test ”.
Cylinder
compression
Result: The results of the compression test are outside
the specifications.
Repair: Investigate the cause and rectify any faults.
Note: Possible causes of low compression are shown in
the following list:
· Loose glow plugs
· Faulty piston
· Faulty piston rings
· Worn cylinder bores
· Worn valves
· Faulty cylinder head gasket
· Damaged cylinder head
Result: The results of the compression test are OK.
Proceed to Test Step 5.
5. Electronic Unit Injectors
A. Use the electronic service tool to perform the automatic “Cylin-
der Cut Out Test” .
Note: If the compression test that was performed in Test Step 4
was satisfactory, the “Cylinder Cut Out Test” will identify any faulty
injectors.
Electronic Unit
Injectors
Result: A faulty injector is indicated.
Repair: Remove any faulty electronic unit injectors. Refer
to Disassembly and Assembly, “Electronic Unit Injector -
Remove”.
Install new electronic unit injectors. Refer to Disassembly
and Assembly, “Electronic Unit Injector - Install”.
Repeat the automatic “Cylinder Cut Out Test” . If the fault
is still apparent, remove the replacement electronic unit in-
jector and install the original electronic unit injector. Refer
to Disassembly and Assembly, “Electronic Unit Injector -
Remove” and Disassembly and Assembly, “Electronic Unit
Injector - Install”.
Result: All injectors are OK.
Proceed to Test Step 6.
6. Pistons and Connecting Rods
A. Inspect the pistons for damage and wear.
B. Inspect the connecting rod bearings for damage and wear.
Pistons Result: One or more components are worn or damaged.
Repair: Replace any worn or damaged parts.
Verify that the repair has eliminated the noise.
Result: All components are OK.
If the fault is still present, contact the Dealer Solutions Net-
work (DSN).
UENR4469-36 97
Symptom Troubleshooting
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