A throttle position sensor ( TPS) is a sensor used to monitor the air intake of an engine. The sensor is usually located on the butterfly spindle/shaft, so that it can directly monitor the position of the throttle. More advanced forms of the sensor are also used. For example, an extra "closed throttle position sensor" (CTPS) may be employed to The hackaday article does a good job describing the problem. The big issue seems to be that there is no back up system to prevent a computer problem from letting this happen. A simple analog circuit that would turn off the fuel injectors if the throttle body position is above 20% open and the commanded throttle is less than 10% would be easy to do. Originally Posted by Jack Klarich. if your Harley throttle by wire acts up and high idles when cold starting, dont panic. Try This. To reset your idle setting back turn the ignition switch on for 10 seconds off for 10 seconds (do not start the engine), repeat a total of 4 times. That should reset your original throttle position. This system is known as the electronic throttle control (ETC) system. When something goes wrong with the ETC system, you will be alerted to the problem by one or more of the following dashboard warning lights: The ETC warning light (a lightning bolt with reversed parentheses on each side) A wrench symbol. It is a ride by wire system. The cables work a rheostat like gizmo and that tells the computer what you want the throttle to do. It then figures out the best way to do that and works the throttle bodies with a servo. Note: this answer only addresses drive-by-wire; I don't know if you could tell whether the other systems employ by-wire technologies as readily. Drive-By-Wire : Look at your throttle body. If it has a throttle plate actuated by cable, you have drive-by-cable, not drive-by-wire. Drive-by-cable examples: Drive-by-wire examples: The throttle position sensor is an electronic device that monitors the position of the throttle, which directly relates to how far down you have pushed your gas pedal. This regulates the amount of air entering the engine, which much then be matched by an appropriate computer-provided amount of fuel to mix with the air. Quick Steer Capable. Available for Mercury outboards rigged with the Single Outboard Electric Steering system, Quick Steer provides rapid steering and more precise throttle control in tight quarters, such as when docking. Quick Steer decreases lock-to-lock steering at the helm to approximately a quarter‑turn in each direction, while still pQ37.