Craftsman 3100iSC Manual De Usuario

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Introduction 
 
 
WHAT IS OBD? 
 
 
47177 1 
 
WHAT IS OBD? 
The diagnostic tool is designed to work on all OBD2 compliant 
vehicles. All 1996 and newer vehicles (cars, light trucks and SUVs) 
sold in the United States are OBD2 compliant. 
One of the most exciting improvements in the 
automobile industry was the addition of on-
board diagnostics (OBD) on vehicles, or in more 
basic terms, the computer that activates the 
vehicle’s “CHECK ENGINE” light. OBD1 was 
designed to monitor manufacturer-specific 
systems on vehicles built from 1981 to 1995. 
Then came the development of OBD2, which is 
on all 1996 and newer vehicles sold in the U.S. Like its predecessor, 
OBD2 was adopted as part of a government mandate to lower vehicle 
emissions. But what makes OBD2 unique is its universal application for 
all late model cars and trucks - domestic and import. This sophisticated 
program in the vehicle’s main computer system is designed to detect 
failures in a range of systems, and can be accessed through a universal 
OBD2 port, which is usually found under the dashboard. For all OBD 
systems, if a problem is found, the computer turns on the “CHECK 
ENGINE” light to warn the driver, and sets a Diagnostic Trouble Code 
(DTC) to identify where the problem occurred. A special diagnostic tool, 
such as the diagnostic tool, is required to retrieve these codes, which 
consumers and professionals use as a starting point for repairs. 
The diagnostic tool provides the additional ability to retrieve enhanced 
DTCs from most Chrysler/Jeep, Ford/Mazda, GM/Isuzu, Honda/Acura 
and Toyota/Lexus vehicles, as well as Anti-Lock Brake System (ABS) 
DTCs and vehicle information. The types of enhanced data available 
depends on the vehicle make.  
 
To learn more about vehicle Computer Control Systems and 
OBD2, see COMPUTER ENGINE CONTROLS on page 15.