Throttle Position (TP) Sensor Performance Check

Turn off ignition switch.
Remove air cleaner assembly. See AIR CLEANER ASSEMBLY REMOVAL AND INSTALLATION .
Remove air cleaner outlet hose.
Disconnect connector from electric throttle body assembly.
Check TP sensor (main and sub) output voltage as follows.
If faulty condition is found, replace throttle body. See THROTTLE BODY REMOVAL AND INSTALLATION .
1. Connect three 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: Checking TP Sensor (Main And Sub) For Output Voltage
  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: TP Sensor Voltage Graph
  Courtesy of SUZUKI OF AMERICA CORP.