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more of vehicle's systems and may cause emissions to exceed federal standards. If the MIL illuminates with a steady light,
it indicates that a problem has been detected and the vehicle should be serviced as soon as possible. Under certain
conditions, the dashboard light will blink or flash. This indicates a severe problem and flashing is intended to discourage
vehicle operation. The vehicle on board diagnostic system can not turn the MIL off until the necessary repairs are
completed or the condition no longer exists.
DTC --Diagnostic Trouble Codes (DTC) that identify which section of the emission control system has malfunctioned.
Enabling Criteria -- Also termed Enabling Conditions. They are the vehicle-specific events or conditions that must occur
within the engine before the various monitors will set, or run. Some monitors require the vehicle to follow a prescribed
“drive cycle” routine as part of the enabling criteria. Drive cycles vary among vehicles and for each monitor in any
particular vehicle.
OBD II Drive Cycle - - A specific mode of vehicle operation that provides conditions required to set all the readiness
monitors applicable to the vehicle to the “ready” condition. The purpose of completing an OBD II drive cycle is to force
the vehicle to run its on board diagnostics. Some form of a drive cycle needs to be performed after DTCs have been
erased from the PCM's memory. Running through a vehicle's complete drive cycle will “set” the readiness monitors so
that future faults can be detected. Drive cycles vary depending on the vehicle and the monitor that needs to be reset.
For vehicle specific drive cycle, consult the vehicle’s Owner’ s Manual.
Freeze Frame Data --When an emissions related fault occurs, the OBD II system not only sets a code but also records
a snapshot of the vehicle operating parameter to help in identifying the problem. This set of values is referred to as Freeze
Frame Data and may include t engine parameters such as engine RPM, vehicle speed, air flow, engine load, fuel pressure,
fuel trim value, engine coolant s, ignition timing advance, or closed loop start.
1.5 Vehicle Coverage
The KONNWEI KW310 OBDII/EOBD Scanner is specially designed to work with all OBD II compliant vehicles, including
those equipped with the next-generation protocol ——Control Area Network (CAN). It is required by EPA that all 1996
and newer vehicles (cars and light trucks) sold in the United States must be OBD II compliant and this includes all
Domestic, Asian and European vehicles.
A small number of 1994 and 1995 model year gasoline vehicles are OBD II compliant. To verify if a 1994 or 1995
vehicle is OBD II compliant, check the Vehicle Emissions Control Information (VECI) Label which is located under the
hood or by the radiator of most vehicles. If the vehicle is OBD II compliant, the label will designate “OBD II Certified” •
Additionally, Government regulations mandate that all OBD II compliant vehicles must have a “common” sixteen- pin
Data Link Connector (DLC).
For your vehicle to be OBD II compliant it must have a 16-pin DLC (Data Link Connector) under the dash and the
Vehicle Emission Control Information Label must state that the vehicle is OBD II compliant.
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