On HDi's it's only for the ECU afaik. When you press the clutch in, the ECU tries to match the revs to the road speed for a smoother gearchange.
On cars with cruise control, its also used as a safety cut-off switch for the cruise. On certain cars (such as Dodge's) it's also used to stop the engine being started unless the clutch is pressed. Made me look like a right dick not being able to start a dodge after servicing it lol.
On cars with cruise control, its also used as a safety cut-off switch for the cruise. On certain cars (such as Dodge's) it's also used to stop the engine being started unless the clutch is pressed. Made me look like a right dick not being able to start a dodge after servicing it lol.