However, I can provide you with the resources to find the exact pinout you need, along with the most common pinout configurations for popular 89661 ECUs (typically found in Corollas, Camrys, and Matrixes).
Since there are thousands of 89661 variations, you should consult these specific databases: toyota 89661 ecu pinout
Without the suffix, a generic pinout is impossible. However, I can provide you with the resources
: Switched +12V power that activates when the ignition is turned to "ON". toyota 89661 ecu pinout
Using a Digital Multimeter (DMM):