Troubleshooting

(Table 33, contd)
Troubleshooting Test Steps
Values Results
4. Electronic Unit Injectors
A. Use the electronic service tool to check for active diagnostic co-
des that relate to the electronic unit injectors.
Diagnostic
codes
Result: There are active diagnostic codes for the fuel
injectors
Repair: Troubleshoot the active diagnostic codes. Refer to
Troubleshooting, “Diagnostic Trouble Codes”
Result: There are no active diagnostic codes for the fuel
injectors.
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 Cut Out Test” . As each cylin-
der 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.
Cylinders Result: There is not a noticeable change in the sound of
the engine for at least one 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: There is a noticeable change in the sound of the
engine for each cylinder.
Contact the Dealer Solution Network (DSN).
i06004613
Exhaust Has Excessive Black
Smoke
If excessive black smoke is caused by a fault in the
engine, and the engine is equipped with a wall-flow
Diesel Particulate Filter (DPF), the smoke will only be
visible when the DPF has also failed. Perform the
following procedure to diagnose the cause of the
black smoke and then investigate the failure of the
DPF.
A faulty DPF will allow some smoke to be visible. In
this situation, there may not be a fault in the engine.
If excessive black smoke is caused by a fault in the
engine, and the engine is equipped with a through-
flow DPF, the DPF will allow some smoke to be
visible. This condition does not mean that the DPF
has failed.
Note: If the DPF is replaced as part of this
procedure, use the electronic service tool to perform
the “
DPF
Replacement Reset” .
Note: If the DPF is replaced as part of this
procedure, use the electronic service tool to perform
the “DPF Replacement Reset” .
Probable Causes
• Diagnostic codes
• Parameters in the Electronic Control Module
(ECM)
• Air intake system or exhaust system
• Valve lash
• Turbocharger
• Low compression (cylinder pressure)
• Electronic unit injectors
• Individual malfunctioning cylinder
Recommended Actions
Note: Complete the procedure in the order in which
the steps are listed.
82 UENR0612-07
Symptom Troubleshooting
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