Throttle Position Sensor Performance Check

1. Remove air intake pipe.
2. Turn OFF ignition switch.
3. Disconnect connector from electric throttle body assembly.
4. Check throttle position sensor (main and sub) output voltage as following steps.
   1. For throttle position sensor (main), arrange 3 new 1.5 V batteries (1) in series (check that total voltage is 4.7-5.0 V) and connect its positive terminal to "Vin" terminal (2) and negative terminal to "Ground" terminal (3) of sensor. Then using voltmeter, connect positive terminal to "Vout 1" terminal (4) of sensor and negative terminal to battery.
      Fig 1: Connecting Battery To TP Sensor Terminals No. 2 & 3

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   2. For throttle position sensor (sub), arrange 3 new 1.5 V batteries (1) in series (check that total voltage is 4.7-5.0 V) and connect its positive terminal to "Vin" terminal (2) and negative terminal to "Ground" terminal (3) of sensor. Then using voltmeter, connect positive terminal to "Vout 2" terminal (4) of sensor and negative terminal to battery.
      Fig 2: Checking Voltage Between TP Sensor Terminal No. 4 & Battery Negative Terminal

      Courtesy of SUZUKI OF AMERICA CORP.
   3. Measure output voltage variation while throttle valve is opened and closed as following specification.

If sensor voltage is out of specified value and linear variation as the following graph, replace electric throttle body assembly.

Throttle position sensor output voltage 

Throttle position sensor (main) variation [A]: 0.304 - 4.325 V at minimum variation, varying according to throttle valve opening by finger (Voltage should vary by about 0.04 V for each 1° valve opening) Throttle position sensor (sub) variation [B]: 4.585 - 0.517 V at minimum variation, varying according to throttle valve opening by finger (Voltage should vary by about 0.04 V for each 1° valve opening) 

Fig 3: Identifying Throttle Valve Opening Position Diagram

Courtesy of SUZUKI OF AMERICA CORP.