Sym GTS 250 Service Manual page 223

2. TPS signal output confirms.
a). Connect the TPS Sensor (Use detection pin)
b). Key-On, but don't start the engine.
c). Use the electric meter DCV function to check the TPS sensor output voltage.
d). Check the output voltage: (Like the following figure 6)
‧Electric meter negative pole─ connect to the first pin of sensor coupler (White / Brown)
‧Electric meter positive pole─ connect to the third pin of sensor coupler (Green / Red)
e). Measure the voltage readings of full-open throttle and full-closed throttle separately.
(A) Full-closed Throttle
Figure. 6 Voltage readings of full-open throttle and full-closed throttle
Fig. 5 TPS working voltage measurement from ECU side
(B) Full-open Throttle
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