Since the 3S-FE was used in the MR2 and Celica, those community forums are treasure troves of PDF scans.
: Details fuel injection and sensor feedback loops.
The most common configuration, particularly for the 1995–1997 RAV4 2.0L (TCCS system), uses a setup: Plug A : 26-pin connector. Plug B : 16-pin connector. Plug C : 12-pin connector. Key Pin Abbreviations & Functions