(Table 6, contd)
Troubleshooting Test Steps
Values
Results
9. Low Compression (Cylinder Pressure)
A. Perform a compression test. Refer to Systems Operation, Test-
ing, and Adjusting, “Compression - Test”.
Cylinder
compression
Result:
The results of the compression test are outside the
specifications.
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 co-
des that relate to the electronic unit injectors.
Diagnostic
codes
Result:
There are active diagnostic codes relating to the
fuel injectors.
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 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).
i05989269
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
This document has been printed from SPI2. NOT FOR RESALE