(Table 86, contd)
Troubleshooting Test Steps
Values Results
4. Electronic Unit Injectors
A. Use the electronic service tool to perform the automatic “Cylin-
der Cutout Test” .
Note: If the compression test that was performed in Test Step 3
was satisfactory, the “Cylinder Cutout 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 Cutout 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 5.
5. Individual Malfunctioning Cylinders
A. With the engine speed at a fast idle, use the electronic service
tool to perform the manual “Cylinder Cutout Test” .
As each cylinder is cut out, listen for a change in the sound from
the engine. When a cylinder is cut out, there should be a notice-
able change in the sound of the engine.
Note: If a change in the sound of the engine is not noted, the iso-
lated cylinder is not operating under normal conditions. If the isola-
tion of a cylinder results in a change in the sound that is less
noticeable, the cylinder may be operating below normal
performance.
Cylinders Result: The test indicates a faulty cylinder.
Repair: Investigate the cause of the fault on any cylinder
that is not operating. Investigate the cause of the fault on
any cylinder that is operating below normal performance.
Result: The test indicates that all cylinders are OK.
Contact the Dealer Solutions Network (DSN).
i06157547
Exhaust Has Excessive Black
Smoke
Engines without a Diesel Particulate Filter (DPF).
If excessive black smoke is caused by an engine
fault, some smoke will be visible at the exhaust pipe
outlet. Perform the following procedure to diagnose
the cause of the black smoke.
Engines with a Diesel Particulate Filter (DPF).
If excessive black smoke is caused by an engine
fault, the smoke will only be visible when the Diesel
Particulate Filter (DPF) has also failed. Perform the
following procedure to diagnose the cause of the
black smoke and then investigate the failure of the
DPF.
Note: A faulty DPF will allow some smoke to be
visible. In this situation, there may not be a fault in the
engine.
Probable Causes
• Diagnostic codes
• Parameters in the Electronic Control Module
(ECM)
• Air intake system or exhaust system
• Valve lash
• Turbocharger or turbochargers
• Low compression (cylinder pressure)
• Electronic unit injectors
• Individual malfunctioning cylinder
UENR4469-36 171
Symptom Troubleshooting
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