Now that you know how many pins are there and what are individual pins for, you can look at the protocol in your car and determine the pinout of the OBD2 scanner that will fit.īonus: Best Professional OBD2 Scanners Review and Comparison 2021 How To Check The OBD2 Protocol On My Car?įor example, for a protocol to be J1850 PWM, pin 2 and pin 10 must be there in the connector (the connector must have metallic contacts inside pins 2, 4, 5, 10, and 16.)
Pin 5: The sensor signal ground is held by this pin.Pin 2: J1850 Bus+ is located on this pin.There are 8 pins at the top row and 8 pins at the bottom row.
Look at the internal teeth on the serial bus and determine which pins are in use and which are empty. This is due to different OBD2 protocols in different models of cars.
This is important because not every protocol connects with the scan tool in the same way. Looking at the DLC pinout, you can determine which OBD2 protocol your vehicle model supports. Which OBD2 Protocol is Supported By My Vehicle? You will find this protocol in many vehicles made after 2008. Since it couldn’t satisfy the OBD2 requirements for U.S vehicles that came before 2003.
The feature helps inform the driver that the system required maintenance. The light cannot be disabled until the problem is fixed.
If there is a malfunction there will be a trouble code displayed, such as a check engine light icon. Since 1996, OBD2 systems are mandatory in every car driving in the USA, however, some older models that date back to 1996 or older do not support OBD2.Īn OBD2 system diagnoses the car’s engine and checks if everything’s working fine. OBDII or OBD2, a short form for On-Board Diagnostics Two, is a system that diagnoses a vehicle’s engine and displays error codes along with other information such as transmission and system performance. It’s an upgraded version of OBD1 and has more advanced features than its predecessor. OBD2 is a term that is used in the automotive industry to refer to the onboard diagnostics system.