Yaris cruise control doesn't work

[pootango]

what does the light weight pulley do for the car ? just help it rev faster?

[jpmck03]

Originally Posted by pootango

what does the light weight pulley do for the car ? just help it rev faster?

Best description I've ever been given:

“Anything that reduces rotational inertia frees up power. That includes the crank pulley, the flywheel, and your wheels/tires.
“Take a CD in with your fingers around the edge, and spin it back and forth. Now imagine it’s made of steel and much heavier. Harder to spin. Same concept.”