TP Sensor (Throttle Position Sensor) Performance Check

Remove air cleaner assembly. See AIR CLEANER ASSEMBLY REMOVAL AND INSTALLATION .
Turn OFF ignition switch.
Disconnect connector from throttle body assembly.
Check TP sensor (main and sub) output voltage as follows.
If faulty condition is found, replace throttle body. See THROTTLE BODY ASSEMBLY REMOVAL AND INSTALLATION .
1. Connect 3 new 1.5 V batteries (1) in series and check that total voltage is 4.5 - 5.0 V.
2. Connect voltmeter (2) and batteries to TP sensor as shown in figure.
  
  Fig 1: Measuring Voltage Between Terminals 5 And 6 Of TP Sensor
  Courtesy of SUZUKI OF AMERICA CORP.
3. Check that voltage varies depending on throttle opening angle as shown in figure while throttle valve is opened and closed by finger.
  
  Fig 2: Throttle Opening Angle Graph
  Courtesy of SUZUKI OF AMERICA CORP.