Sym GTS 250 Service Manual page 225

2). Check procedure:
1. Electrical Resistance measurement.
a). Disassemble the TW sensor.
b). Use the Resistance mode on the electric meter to check the OHM value of TW
sensor (Like the following Figure 8)
3). Malfunction determination:
a). The following figure is the relation between electrical resistance and temperature.
4). Abnormal phenomenon and treatment:
a). Sensor error or the coupler has bad contact.
b). Check Wire harness for twisted or bad contact wires.
c). ETS abnormal, replace with a new sensor .
Fig. 8 Measuring the electrical resistance of TW
Temp(℃) Electrical Resistance(KΩ)
-20
40
100
sensor.
18.8 ± 2.4
1.136 ± 0.1
0.1553 ± 0.007
10