Help Determine Vehicle OBD Protocol
New to the forum, but have visited the site many times. Great info and I appreciate everyones efforts. Wish I had signed up sooner so as not to be asking for help from my first post, but I'm really in a pickle trying to figure out what protocol my truck uses.
The truck is a 2006 Nissan Titan King-cab LE, 4x4 5.6L
The J-1962 (OBD-II connector) has the following pins occupied:
ISO-9141-2 & ISO-14230 are said to use pin 7 & sometimes pin 15. Pin 7 is in use, while pin 15 is Not.
CAN is said to use pins 6 & 14. Both are in use.
So there is my problem. Everything I've found on-line to help figure out what protocol is in use, describes looking at what pins are in use. But with my truck it could be either ISO-9141-2/14230 or CAN.
I've called a couple of Nissan dealerships and they were no help. I've also been in contact with a company that manufactures obd diagnostic products and their trying to help as well. I'm at a loss. Not sure what else I can do to determine what protocol is in use.
I need to know this because the ISO protocols are too slow for the device I'm looking to buy. Its expensive and has a restocking fee, so I want to make sure the truck is using CAN before I buy.
I have read the volts while key is in the off position and they are:
(meter negative to vehicle ground)
CAN Pins 6 & 14 are + .738Vdc
ISO Pin 7 is + 2.85Vdc
Not sure if that helps, but figure I'd post.
Any help in figuring out what protocol is used would be greatly appreciated.