92 SC400 40/40/40 ecu plug questions

[TEXASRS]

Working on wiring my 1UZ...all my documentation talks about 4 ecu plugs (3 into the ecu and 1 on a bracket away from ecu) which plug is the 4th?

 

[Zuffen]

The Crown engine had an ECU with 3 plugs in the body and a stand alone 8 wire plug.

I'm guessing you're looking at Crown information where you need the SC diagram.