Shenzhen Scan-DIY CR-PRO, Руководство пользователя

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21 SCAN-DIY CR-PRO User’s Manual
1.4 Introduction to On­Board Diagnostics OBD II
On­board diagnostics version II (OBD II) is a system that the Society of
Automotive Engineers (SAE) developed to standardize automotive
electronic diagnosis.
Beginning in 1996, most new vehicles sold in the United States were
fully OBD II compliant.
✓
Technicians can now use the same tool to test any OBD II
compliant vehicle without special adapters. SAE established
guidelines that 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.
SAE Publications
SAE has published hundreds of pages of text defining a standard
communication protocol that establishes hardware, software, and
circuit parameters of OBD II systems.
| SCAN-DIY CR-Pro Work On OBD-II/EOBD-II/CANBUS Protocol Vehicle