What Is The Wire Below The Throttle Wire?

[Eric Cheung]

The throttle wire is attached to a small black flywheel, which when the accelerator is stepped on it rotates due to the pull from the throttle wire.

As this flywheel rotates, it pulls another, thinner, wire below it. This wire seems to go into the transmission. I notice this wire is kind of slack. Do I need to tighten it? What is this wire for? Thanks in advance.

A picture showing the wire and the throttle wire is attached.

[wwest]

Goes to the cruise control servomotor.

[Eric Cheung]

Goes to the cruise control servomotor.

My car doesn't have cruise control, does that mean this wire does not serve any function in my car?