(Table 87, contd)
Troubleshooting Test Steps
Values Results
8. Electronic Unit Injectors
A. Use the electronic service tool to perform the automatic
“Cylinder Cut Out Test” .
Note: If the compression test that was performed in Test Step
7 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 injector
and install the original electronic unit injector. Refer to Disas-
sembly and Assembly, “Electronic Unit Injector - Remove”
and Disassembly and Assembly, “Electronic Unit Injector -
Install”.
Result: All injectors are OK.
Proceed to Test Step 9.
9. Individual Malfunctioning Cylinders
A. With the engine speed at a fast idle, use the electronic serv-
ice tool to perform the manual “Cylinder Cut Out 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
noticeable change in the sound of the engine.
If a change in the sound of the engine is not noted, the isolated
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.
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).
i08481016
Exhaust Has Excessive White
Smoke
Note: Some white smoke may be present during cold
start-up conditions and during acceleration after a
prolonged period at low idle. If the white smoke
persists, there may be a fault.
Probable Causes
• Diagnostic codes
• ECM Flash file
• Glow plugs
• Ether injection
• Coolant temperature
• Cooling system
• Fuel quality
• Valve lash
• Low compression (cylinder pressure)
• Electronic unit injectors
• Individual malfunctioning cylinder
UENR4469-36 175
Symptom Troubleshooting
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