Troubleshooting

(Table 31, contd)
Troubleshooting Test Steps
Values Results
4. Low Compression (Cylinder Pressure)
A. Perform a compression test. Refer to Systems Operation, Test-
ing, and Adjusting, “Compression - Test ”.
Low
compression
Result: Low compression is recorded on one or more
cylinders.
Repair: 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
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
Repair: Troubleshoot the active diagnostic codes. Refer
to Troubleshooting, “Diagnostic Trouble Codes”
Result: All injectors are OK.
Contact the Dealer Solution Network (DSN).
i06225011
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.
UENR0612-07
77
Symptom Troubleshooting
This document has been printed from SPI2. NOT FOR RESALE