(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
Symptom Troubleshooting
This document has been printed from SPI2. NOT FOR RESALE
To Next Page
Loading...
