Throttle Body System Operation Check

Remove air cleaner assembly. Refer to AIR CLEANER ASSEMBLY REMOVAL AND INSTALLATION
Turn ignition switch to ON position.
Check throttle body system as follows.
If faulty condition is found, go to step 4).
1. Depress accelerator pedal gradually and check that throttle valve moves smoothly until it opens fully.
2. Release accelerator pedal and check that throttle valve moves back to default position.
  Throttle valve default position "a":
  
  7° from completely closed position (1)
  
  Fig 1: Identifying Throttle Valve Closed Position
  Courtesy of SUZUKI OF AMERICA CORP.
Check the following.
If check results are satisfactory, replace throttle body assembly.
- Wire harness and connections
- APP sensor: Refer to APP (Accelerator Pedal Position) Sensor On-Vehicle Inspection
- TP sensor: Refer to TP Sensor (Throttle Position Sensor) Performance Check
- Throttle motor: Refer to Throttle Motor Check