Vehicle diagnostics are the mechanics involved with identifying and assessing problems that may negatively affect the normal operation of a vehicle. Mechanics may employ a wide range of techniques and tools in conducting vehicle diagnostics, ranging from cursory physical checks to more involved, computer-based analysis. Given the sometimes occult nature of mechanical problems, effective diagnostics are critical to successful repairs and the smooth running of any vehicle.
There are two types of diagnostics.
On-Board-Diagnostic
Off-Board-Diagnostic
On-Board-Diagnostic:
Built-In software function of ECUs, used for self diagnostic and to monitor sensors and actuators.
Off-Board-Diagnostic:
Specific diagnostic device(tester) combined with measurement technology ,remaining bus simulation and database.
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