Sym GTS 250 Service Manual page 229

Figure 11. O
2. Electrical Resistance confirm
a). Separate the coupler between O
b). Use the resistance mode on the electric meter.
c). Measuring the value on the O
Use the electric meter negative pole to connect the second pin in the coupler (White)
Electric meter positive pole ─ connect to the first pin of coupler (White )
Black(3)
signal(+)
white(2)
heater(+)
Figure 12 The Coupler of O
Sensor heater voltage measurement
2
Sensor and Wire harness, as the figure 12 shows.
2
sensor side coupler: (as the figure 13 shows)
2
Grey(4)
signal (-)
White(1)
heater(-)
Sensor from sensor side view
2
14