Create my own OBD2 splitter and extend an OBD2 cable with ONLY the required wires under my van to the front-dash.
My '86 VW van has a 2001 Subaru Legacy engine in it, but the engine bay is in the rear of the van. I want to run "required" OBD2 wires up front and make an OBD2 diagnostic port available in the van's dash area. Yes, I know Bluetooth exists, but I want a mechanic to be able to use their preferred scantool under the dash while test driving it, so I am running wires from back to front regardless of this fancy, Bluetooth technology.
I look at the 2001 Subaru OBD2 connector and it has 8 wires connected to it.
I went to the scrap yard and pulled two more Diagnostic Ports w/ OBD2 connectors for my project and I see 7 wires connected to the OBD2 connectors! What? These 7 pin connectors were pulled from a 2001 and 2003. To make matters more confusing, I have a friend with a later model VW/Subaru conversion with drive-by-wire (2011) that only has 3 wires connected on his custom OBD2 port for his VW van project (note: "custom", not stock)...
Why are they different?
What pins in my OBD2 do I really need to wire up on my project? I don't want to split & run 8 wires up front, if I only need 3...
Edited by coclimber, 25 February 2014 - 07:29 PM.