Roadi RDT40 - Manual (Page 4)

OWNER S MANUAL
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OBD2 CODE READER
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6. Use extreme caution when working around the ignition coil, distributor
cap, ignition wires and spark plugs. These components create hazardous
voltages when the engine is running.
7. Put transmission in PARK (for automatic transmission) or NEUTRAL (for
manual transmission) and make sure the parking break is engaged.
8. Keep a fire extinguisher suitable for gasoline/chemical/electrical fires
nearby.
9. Don't connect or disconnect any test equi pment with ignition on or
engine running.
10. Keep the Scan Tool dry, clean and free from oil, water and grease.
Use a mild detergent on a clean cloth to clean the outside of the Scan
Tool, when necessary.
2. GENERAL INFORMATION
2.1 On-Board-Diagnostics (OBD) 2
The first generation of On-Board Diagnostic (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 and the desire to improve On-Board Diagnostic capability
increased, a new generation of On-Board Diagnostics 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