Sym GTS 250 Service Manual page 224

@ If a Diagnostic is available; we can check the TPS voltage output on the function menu.
a). Connect the Diagnostic; Key-On, but don't start the engine
b). Use the Data Stream mode to view the readings of TPS sensor.
c). Twist the throttle grip to view the voltage value, as the following figure 7 shows.
Figure 7. TPS sensor voltage value readings on Diagnostic screen
4). Malfunction determination:
a). Working voltage value =
b). Full-closed throttle voltage =
c). Full-open throttle voltage =
5). Abnormal phenomenon and treatment:
a). Sensor error or coupler bad contact.
b). Check Wire harness for twisted or bad contact wires.
c). TPS may be abnormal; replace with a new throttle body and measure again.
*****Disassembly of TPS sensor from Throttle body is strictly forbidden. *****
4. TW Sensor (Water Temp. Sensor):
1). Illustration:
5.0 V ± 0.1 V
0.6V ± 0.02V
3.77V ± 0.1V
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