Troubleshooting

(Table 34, contd)
Troubleshooting Test Steps
Values Results
7. Electronic Unit Injectors
A. Use the electronic service tool to check for active diagnostic
codes that relate to the electronic unit injectors.
Diagnostic
codes
Result: There are active diagnostic codes for the fuel
injectors
Troubleshoot the active diagnostic codes. Refer to Trouble-
shooting, “Diagnostic Trouble Codes”
Result: There are no active diagnostic codes for the fuel
injectors.
Proceed to Test Step 8.
8. 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 no-
ticeable change in the sound of the engine.
Cylinders Result: There is not a noticeable change in the sound of the
engine for at least one 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: There is a noticeable change in the sound of the en-
gine for each cylinder.
Contact the Dealer Solution Network (DSN).
i06006429
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
• Starting aids
• Coolant temperature
• Cooling system
• Fuel quality
• Valve lash
• Low compression (cylinder pressure)
• Individual malfunctioning cylinder
Recommended Actions
Diagnostic Codes
Note: The procedures have been listed in order of
probability. Complete the procedures in order.
UENR0612-07 85
Symptom Troubleshooting
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