ECU Terminal 2C ground
 

So I'm going through and verifying terminal connections. The manual says 2C should be a black wire that's grounded... couple of problems.

Problem 1: The 2C wire is Brown/Black. Good news, I was able to verify that my throttle sensor, variable resistor, pressure sensor....etc share the same Brown/Black wire.

Problem 2: I cannot find anywhere in the harness where the 2C wire (Br/B) would connect to the B (Em) wire as shown in red below. Can anyone confirm this?

EDIT: I have a 87 Turbo II by the way. I'm looking at the wiring for the N/A version which doesn't have the red line shown above. Was there a difference between years?

https://cimg9.ibsrv.net/gimg/www.rx7...a41e54751c.jpg