Operating & Maintenance Manual Lubrication
68
Troubleshooting
General Troubleshooting Information
Troubleshooting engine problems can be difficult.
In this section is a list of possible engine problems that may be encountered accompanied by
possible causes and corrections. The illustrated diagrams and troubleshooting information are
of a general nature. See your engine distributor or servicing dealer if you are in doubt.
A reliable program for troubleshooting engine problems should include the following basic
diagnostic thought process:
• Know the engine and all related systems.
• Study the problem thoroughly.
• Relate the symptoms to your knowledge of engine and systems.
• Diagnose the problem starting with the easiest things first.
• Double-check before beginning the disassembly.
• Determine cause and make a thorough repair.
• After making repairs, operate the engine under normal conditions to verify that the
problem and cause was corrected.
NOTE: The engines covered in this manual have electronic control systems
which send diagnostic trouble codes to signal problems.
Precautions for Welding on Engines Equipped with Electronic Engine Control
Unit (ECU)
IMPORTANT: ALWAYS disconnect Electronic Control Unit (ECU) connectors and
engine control system-to-machine ground before welding on engine or machine. High
currents or electro-static discharge in electronic components from welding may cause
permanent damage.
1. Remove the ground connection for the engine control system-to-machine
frame.
2. Disconnect the connectors from the ECU.
3. Connect the welder ground close to the welding point and be sure ECU or other
electronic components are not in the ground path.
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