Reply #23: There's a better way to "scram" a car

[jmowreader]

Something in the Toyota's control system is keeping the engines from slowing down, right? Which means the electronic throttle butterfly is hanging open. You could "scram" that thing with two parts: a foglight relay and an Emergency Stop switch like on a piece of industrial equipment. The relay goes into the control line to the butterfly. With the switch in the "out" position, the relay is energized and signals from the ECU go to the electronic butterfly. Push the switch to the "in" position--they're made to be slapped--and the signals from the ECU are cut off. The loss of signal causes the butterfly to close, and the engine goes to idle. Simple and effective.