Harbor Freight Tools OBD II & CAN Scan Tool with ABS Manual Pagina 4

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Page 4 For technical questions, please call 1-888-866-5797. Item 60794
2. General Information
2.1 On-Board Diagnostics (OBD) II
The first generation of On-Board Diagnostics (called OBD I)
was developed by the California Air Resources Board
(ARB) and implemented in 1988 to monitor some of the
emission control components on vehicles. As technology
evolved and the desire to improve the On-Board Diagnostic
system increased, a new generation of On-Board Diagnostic
system was developed. This second generation of On-
Board Diagnostic regulations is called OBD II.
The OBD II system is designed to monitor emission control systems
and key engine components by performing either continuous or
periodic tests of specific components and vehicle conditions. When
a problem is detected, the OBD II system turns on a warning lamp
(MIL) on the vehicle instrument panel to alert the driver typically
by the phrase of “Check Engine” or “Service Engine Soon”.
The system will also store important information about the
detected malfunction so that a technician can accurately
find and fix the problem. Here are three examples:
1. Whether the Malfunction Indicator Light
(MIL) is commanded 'on' or 'off'
2. Which, if any, DTCs are stored
3. Readiness Monitor status
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