2 DIAGNOSTIC/TROUBLESHOOTING MANUAL
Service Diagnosis
Service diagnosis is an investigative procedure that
must be followed t o find and correct an engine
application problem or an engine problem.
If the problem is engine application, see specific
vehicle manuals for further diagnostic information.
If the problem is the engine, see specific Engine
Diagnostic Manual for further diagnostic information.
Prerequisites for Effective Diagnosis
• Availability of gauges and diagnostic test
equipment
• Availability of current information for e ng ine
application and engine systems
• Knowledge of the principles of operation for
engine application and engine systems
• Knowledge to understand and do procedures in
diagnostic and service publications
Technical Service Literature required for Effective
Diagnosis
• Engine Service Manual
• Engine Diagnostic Manual
• Diagnostics Forms
• Electronic Control Systems D iagnostics Forms
• Service Bulletins
EGES-270-1
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
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