OBD-II Interface – An improvement over OBD-I

 OBD-II systems are sealed and do not allow chip
The OBD-II interface, an advanced new standardreplacements.  However, OBD-II provides a
over OBD-I, was introduced in the mid 90s. Thisreal-time data acquisition system that is useful to
standard provides near complete engine controltechnicians. Technicians can actually reprogram the
and also helps in monitoring parts of the chassisperformance parameters of the OBD-II system
and accessory devices as well as acts as ato accommodate performance options.
complete diagnostic control. 
 Proprietary sensor readings:
Pre OBD-II connectors were usually lined underThough not a part of the OBD-II standards, the
the hood or the dashboard of the car whilediagnostic readouts used by the dealership
OBD-II is always placed within the reach of thetechnicians are also through OBD-II connectors.
driver (ideally within 2 feet from the steeringThis helps in reading information like ignition
wheel).voltage, individual cylinder misfires, ABS brake
 conditions, etc.
Usage: The usages of OBD-II are aplenty. Some 
of them are as follows:There can be over 300 readings available
 depending on the vehicle manufacturer and model.
(a) Troubleshooting:Scanners are of different types. Some scanners
OBD-II signal diagnosis, under most cases, is donejust show the basic OBD-II signals. Some other
in response to the "Check Engine" light on thescanners are capable of showing the full range of
instrument cluster or in response to drivabilitysystem codes that have been used.
problems reported by a user. The scan results 
from OBD-II can pinpoint malfunctions to specificReal-time information:
devices, thereby saving substantial amount ofWe have now seen many vehicles coming up with
time and cost when compared to the traditionalmultiple information systems as a part of the
guess and repair (read trail-and-error) methods.instrumentation cluster. This feature has been
 possible because of OBD-II which is capable of
(b) Vehicle Health Check:relaying run-time information like current mileage,
This technology can also help by providing valuablebest mileage conditions, miles on available gas,
information on the condition of a second hand cartemperature etc.
that you wish to buy. 
 Car designs are more computerized and more
(c) Engine tweaks:complicated now than ever. All information
While majority of drivers prefer their vehicles toregarding your vehicle maintenance, performance
be dependable and economical; many of us looktuning, diagnostics and repair, driver evaluation,
to OBD-II for that extra performance out of theiretc. can be had on its on-board computer
rides.systems.