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Getting Started
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2
OBD II
On-board diagnostics version II (OBD II) is a system the Society of
Automotive Engineers (SAE) developed to standardize automotive
electronic diagnostics. Since1996, most new vehicles sold in the United
States are fully OBD II compliant. Technicians can use the same tool
to test any OBD II compliant vehicle without special adapters.
SAE established guidelines to provide:
A universal connector, called the DLC, with dedicated pin
assignments.
A standard location for the DLC, visible under the dash on driver’s
side.
A standard list of diagnostic trouble codes (DTCs) used by all
manufacturers.
A standard list of parameter identification (PID) data used by all
manufacturers.
Ability for vehicle systems to record operating conditions when a
fault occurs.
Expanded diagnostic capabilities that records a code whenever a
condition occurs that affects vehicle emissions.
Ability to clear stored codes from the vehicle’s memory with a
Scan Tool.
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