Sym GTS 250 Service Manual page 238

2). Check procedure:
Measuring the electrical resistance:
a). Use the Ohm function of electric meter to check the resistance value of pulse sensor
(As shown in figure 23 )
Figure 23. Measuring the resistance value of pulse sensor
4). Malfunction determination:
Electrical resistance value = 80~160(Ω)
5). Abnormal phenomenon and treatment:
a). Sensor error or the coupler has bad contact.
b). Check Wire harness for twisted or bad contact wires.
c). CPS abnormal, replace with a new sensor
11、AT (Air Temperature sensor)
1). Picture illustration:
23