[kamiraa]

Has anyone ever used this connector, it's under the hood by the firewall.

I always see it, but never saw a tool to plug into it. Does it give the same data as the obd2 plug inside the car?

 

[JonoTurbo]

No it doesn't, Toyota actually had a tool that plugged into it, but I suspect its pretty hard to get. You can check your ecu/airbag system codes, jump your fuel pump, and do a few other things with a couple of wires and the service manual though.

 

[Ryeno]

You don't really use a tool (besides for the OX1), just jump the pins when trying to diagnose an issue. Half the functions are duplicated tho in the OBD-I port under the dash.

 

[RogueSupra]

correct this is all in the TRSM and here on the forum.

 

[kamiraa]

I'm building a custom mil-spec engine harness, moving some stuff around, removing some plugs no longer required, adding some. I wonder if I should keep the Data connection plug there.

Will the diagnosis stuff still work without a factory ECU (AEM Gen 2)