Throttle Valve Operation Check

Turn OFF ignition switch.
Remove air cleaner assembly. See AIR CLEANER ASSEMBLY REMOVAL AND INSTALLATION .
Check throttle valve operation as follows.
If faulty condition is found, replace throttle body. See THROTTLE BODY ASSEMBLY REMOVAL AND INSTALLATION .
1. Check that throttle valve (1) moves smoothly from fully closed position and fully open position with finger.
  
  Fig 1: Checking Throttle Valve
  Courtesy of SUZUKI OF AMERICA CORP.
2. Check that throttle valve returns off to default position when you move finger off throttle valve at fully closed position and fully open position.
  Throttle valve default position "a":
  
  7° from completely closed position (1)
  
  Fig 2: Identifying Throttle Valve Closed Position
  Courtesy of SUZUKI OF AMERICA CORP.