ELM327 Bluetooth supports all OBD-II protocols
ISO15765-4 (CAN)
ISO14230-4 (KWP2000)
ISO9141-2
J1850 VPW
J1850 PWM
Function:
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 Temperatur                                  
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                                        
Upcoming Features:                               
Data graphing and logging         
Freeze Frame data
Continuous and Non-Continuous Oxygen Sensor test results  
Many others...