Specifications:
Processor: ELM327.
OBD-II Software for ELM327 is a free program that allows you to use your PC and a hardware interface to get the information from your car's computer.
It is also very easy to install: simply extract the files into a folder on your computer's hard drive, and you're ready to go.
To uninstall the program, simply delete the entire contents of the folder where the program resides.
The software supports two platforms - DOS and Windows.
 
OBD-II Protocols:
ISO15765-4 (CAN)
ISO14230-4 (KWP2000)
ISO9141-2
J1850 VPW
J1850 PWM
Output protocol: RS232
Baud rate: 9600 or 38400
Indicator LEDs: OBD Tx/Rx, RS232 Tx/Rx, Power
Operating voltage: 12V, internal protection from short circuits/overvoltages
Nominal idle current: 45 mA
 
Features:
The program lets you perform the following operations:
Read diagnostic trouble codes, both generic and manufacturer-specific, and display their meaning (over 3000 generic code definitions in the database).
Clear trouble codes and turn off the MIL ("Check Engine" light)
Display current sensor data, including:
Engine RPM, Calculated Load Value, Coolant Temperature, Fuel System Status, Vehicle Speed, Short Term Fuel Trim, Long Term Fuel Trim, Intake Manifold Pressure, Timing Advance, Intake Air Temperature, Air Flow Rate, Absolute Throttle Position, Oxygen sensor voltages/associated short term fuel trims, Fuel System status, Fuel Pressure and etc.
 
Upcoming Features:
Data graphing and logging
Freeze Frame data
Continuous and Non-Continuous Oxygen Sensor test results
 
Free software:
Scantool.net
GM Mode 22 Scan Tool by Terry
OBD Gauge for PalmOS and Pocket PC by Dana Peters
OBD Logger by Jonathan Senkerik
OBD-II ScanMaster by Wladimir Gurskij (ScanMaster 3.52 - local copy)
obd2crazy.com
OBD2 Scantool by Ivan Andrewjeski
OBDII for ELM322 by David Huffman
pyOBD by Donour Sizemore for MacOSX and Linux
RDDTC by Pete Calinski
Real Scan by Brent Harris
ScanTest for Pocket PC by Ivan Ganev aka a-ser
wOBD by WDT
 
Aavailable cars:
Benz 2001/02/03 W203 C200K (ISO)
BMW X5 2002 (ISO) Chevrolet Aveo (ISO)
Citroen C3 2004 (ISO) ? Daihatsu YRV 2005 (ISO)
Daihatsu YRV Turbo 2006 (ISO)
Fiat Tipo 2002 (ISO)   
Ford New?ocus 2006(CAN)
Honda Accord 2006 JDM (ISO)
Hyundai Sonata 2005 (ISO)
Hyundai Tuscani FX (ISO)
Kia Carens 2005 (ISO)
Lexus es300 Mazda 2 (CAN)
Mazda Premacy 2001 (ISO)
Mitsubishi Colt Plus 2005 (ISO)
Mitsubishi Eclipse(GST-----Turbo Car can be tested for the year 1995-2000 ；RS/GS----1994-1996 GS all can do；Turbo Car for the year 1996-2000,only have speed and TPS，can clear the DTCS)
Nissan Sunny B14 (ISO)
Peugeot 407 (ISO)
Renault Kangoo 2006 (ISO)
Subaru Impreza 1.6TS 2002 (ISO)
Toyota Corolla Altis 1.6A 2005 (ISO)
Toyota Corolla GLXi G8 1999 (ISO)
etc.
 
Not available veichles:
Mazda 323 Protege 2003 (OBD-I)
Mitsubishi Lancer 1.6M 2006
Nissan Sunny (N16)
Nissan Cefiro (Teana) 2005
Nissan sentra 1.8 2000/2005
Nissan Cefiro (Teana) 2005
Proton Perdana V6
Subaru Legacy GT 2005
Toyota camry 2002
Toyota Wish JDM (Missing Pin 5 in DLC)
Toyota IST JDM (Missing Pin 5 in DLC)
Toyota altis 1.8 2004
Peugeot 206 2000
Suzuki Jimny 1.3 2000
Diesel engine

Package includes：
1 x ELM327 USB interface
1 x CD software