Troubleshooting

(Table 6, contd)
Troubleshooting Test Steps Values Results
9. Low Compression (Cylinder Pressure)
A. Perform a compression test. Refer to Systems Operation,
Testing, 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 10.
10. 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 relating to the
fuel injectors.
Repair: Troubleshoot the active diagnostic codes.
Refer to Troubleshooting, “Diagnostic Trouble Codes”.
Result: All injectors are OK.
Proceed to Test Step 11.
11. 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 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.
If a change in the sound of the engine is not noted, the isolated
cylinder is not operating under normal conditions. If the isolation
of a cylinder results in a change in the sound that is less notice-
able, 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).
i06221197
Alternator Problem
(Charging Problem and/or Noisy
Operation)
Probable Causes
• Alternator
• Charging Circuit
Recommended Actions
Note: The procedures have been listed in order of
probability. Complete the procedures in order.
34 UENR0612-07
Symptom Troubleshooting
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