Bosch CP009 User Manual download pdf (Page 66)

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Chapter 5

Generic OBD2

Chapter 5 - 1

I. Literal definition of OBD and OBD2-------

OBD is an abbreviation for On Board Diagnostics. OBD-1 is in referen

ce to

Title 13 California Code 1968 titled "Malfunction and Diagnostic System for

1988 and Subsequent Model Year Passenger Cars, Light-Duty Trucks, and

Medium-Duty Vehicles with Three-Way Catalyst Systems and Feedback

Control." filed on 11-15-85. This required cars sold in California to have an

on-board computer processor for on-board self-diagnostics of computer

sensed emission related components, fuel metering device and EGR

(exhaust gas recalculation system). A partial or total malfunction that

exceeded exhaust emission standard would illuminate a MIL (malfunction

indicator light) and provide on-board identification of the malfunction

location. To provide malfunction location information, codes are stored in on-

board computer memory. To read codes manufactures use methods, such

as flashing MIL light or various serial data protocols.

OBD-2 is in reference to Title 13 California Code 1968.1 titled "Malfunction

and Diagnostic System Requirements-1994 and Subsequent Model-Year

Passenger Cars, Light-Duty Trucks, and Medium-Duty Vehicles and

Engines. Filed on 8-27-90 to Air Resouce Board (ARB)

This requires a standard electrical connector, open source standardized

diagnostic trouble codes (DTC), data, and communication protocol with more

specific self-diagnostic on-board monitoring of emission malfunctions.

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Bosch CP009 User Manual Page 66