Sym GTS 250 Service Manual page 228

6. O Sensor (Exhaust Gas Oxygen Sensor):
2
1). Illustration:
2). Power Source:
a). Heating coil: From Battery
3). Check procedure:
1. Working voltage confirmation
a). Separate the coupler between O
figure 10.
b). Key-On, but don't start the engine.
c). Use the electric meter DCV function to check the O
d). Check the working voltage (From the wire harness side):
(Like the following figure11)
Use the electric meter negative pole to connect the second pin in the coupler
(Red/orange)
Use the electric meter positive pole to connect the first pin in the coupler (Red /
Yellow )
Green/Red(3)
Red/Orange(2)
Figure 10. Wire harness side O
Sensor and Wire harness; the pin assignment is like
2
Blue/Orange(4)
Red/Yellow(1)
Sensor Coupler
2
13
Sensor heater voltage.
2