1. Introduction
The Creader Professional CRP123 is specially developed by LAUNCH, which
supports all 10 modes of OBD II test for a complete diagnosis. Featuring the
3.5” TFT color display, it enables users to read/clear DTCs, record, save and
playback data in live graphic display. The CRP123 is also very easy to use. With
built-in help menus and code denitions, diagnosing and repairing that dreaded
Check Engine Light is now easier than ever!
Moreover, CRP123 also features the following bi-directional “special tests”:
EVAP, O2 Sensor, I/M Readiness, MIL Status, VIN Info, and On-board monitors
testing.
It can be connected to PC through the USB cable for upgrade to keep updated
with the latest software version.
Notice: CRP123 may automatically reset while being disturbed by strong static
electricity. THIS IS A NORMAL REACTION.
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 specic
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 nd and x 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.
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