So, you have found your OBD2 port and now you are wondering what is all this talk about protocols and what does this mean for the 16 pins on my OBD2 port wiring.
When you look at your OBD2 port you will notice that not all the pins have a metal connecter in them. These ones are empty and only the ones that have are connecter in them are used by your car. The reason why some of them a different is the pins related to which OBD protocol your car uses. Most Australian cars newer than 2006 use the common protocols so most OBD2 Scan Tools will work.
As you can see above this is how the pins are allocated and you will be able to check your OBD2 port and see what protocol your car has.
OBD2 Australian compliant vehicle can use any of the five communication protocols:
- SAE J1850 PWM
- SAE J1850 VPW
- ISO14230-4 (KWP2000)
- ISO 15765-4/SAE J2480
Now you may have seen some tools say that they cover 9 protocols and this is true to a point it just means the cover the variants of the ISO 15765-4. So just check out your OBD2 port and you should be able to tell what protocol for OBD2 that your car uses. Sometimes the other wiring pins will have connecters in them and this is for other specific tasks that manufacture specific tools can do.