Thinkcar THINKSCAN Max Manual De Instrucciones página 8

THINKSCAN Max
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2 General information
2.1 On-Board Diagnostics (OBD) II
The first generation of On-Board Diagnostics (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 OnBoard 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 specifi c 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 below follow three pieces of such valuable information:
1) Whether the Malfunction Indicator Light (MIL) is commanded 'on' or 'off ';
2) Which, if any, Diagnostic Trouble Codes (DTCs) are stored;
3) Readiness Monitor status.
2.2 Diagnostic Trouble Codes (DTCs)
OBD II Diagnostic Trouble Codes are codes that are stored by the on-board computer
diagnostic system in response to a problem found in the vehicle. These codes identify a
particular problem area and are intended to provide you with a guide as to where a fault
might be occurring within a vehicle. OBD II Diagnostic Trouble Codes consist of a fi ve-
digit alphanumeric code. The fi rst character, a letter, identifi es which control system sets
the code. The second character, a number, 0-3; other three characters, a hex character,
0-9 or A-F provide additional information on where the DTC originated and the operating
conditions that caused it to set. Here below is an example to illustrate the structure of the
digits:
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