Throttle Valve Operation Check

Remove air intake pipe.
Turn OFF ignition switch and then disconnect connector from electric throttle body assembly.
Move throttle valve with finger to its full open position and check that it moves smoothly.
Move throttle valve with finger to its completely closed position and check that it moves smoothly.

Fig 1: Moving Throttle Valve To Full Open Position With Finger
Courtesy of SUZUKI OF AMERICA CORP.
Take off finger from throttle valve (1) which is at full open position and check that it moves smoothly by its return spring and open spring force back to default position (position where throttle valve is open by 10° (2) from completely closed position).
Take off finger from throttle valve (1) which is at completely closed position and check that it moves smoothly by its return spring and open spring force back to default position.

Fig 2: Throttle Valve Open By 10° From Completely Closed Position
Courtesy of SUZUKI OF AMERICA CORP.

If check result is not satisfactory, replace electric throttle body assembly.