Some may call it reverse engineering.

Pictures with descriptions to follow.

Two Fuel Injector transistors, driven by chips

Two Regulators - 

one provides 5v ref voltage for the TPS, etc

one  provides ??v vcc to all chips on board, as well as the pull-up for the ignition signal from ECU to ignition module

Fuel pump drive transistor

Stepper motor driver

Chip drives/grounds the check engine light and