(Table 31, contd)
Troubleshooting Test Steps
Values
Results
4. Low Compression (Cylinder Pressure)
A. Perform a compression test. Refer to Systems Operation, Testing,
and Adjusting, “Compression - Test”.
Low
compression
Result:
Low compression is recorded on one or more
cylinders.
Possible causes of low compression are shown in the fol-
lowing list:
·
Loose glow plugs
·
Faulty piston
·
Faulty piston rings
·
Worn cylinder bores
·
Worn valves
·
Faulty cylinder head gasket
·
Damaged cylinder head
Make any repairs, as necessary.
Result:
No faults found.
Proceed to Test Step 5.
5. Electronic Unit Injectors
A. Use the electronic service tool to check for active diagnostic co-
des that relate to the fuel injectors.
Diagnostic
codes
Result:
There are active diagnostic codes for the fuel
injectors
Troubleshoot the active diagnostic codes. Refer to Trou-
bleshooting, “Diagnostic Trouble Codes”
Result:
All injectors are OK.
Contact the Dealer Solution Network (DSN).
i05874017
Engine Top Speed Is Not
Obtained
Note:
If this fault occurs only under load, refer to
Troubleshooting, “Acceleration Is Poor or Throttle
Response Is Poor”.
Probable Causes
• Diagnostic codes
• Engine accessories and transmission
• ECM parameters
• Throttle signal from the throttle position sensor
• Air intake and exhaust system
• Fuel system inspection
• Fuel filters
• Low compression (cylinder pressure)
• Individual malfunctioning cylinders
Recommended Actions
Note:
The procedures have been listed in order of
probability. Complete the procedures in order.
74
UENR0612
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