Sym JOYMAX 250 - Page 230

15
3. Use Diagnostic to check the working condition of O
2
Sensor.
a). Connect the Diagnostic, Key-on and start the engine.
b). Fully warm up the engine (Idle the engine at least 5min), use the main stand to lift off the
rear wheel. Accelerate the engine around 4500rpm, and observe the O
2
Sensor working
condition.
c). Use the Diagnostic “Data Stream” mode, and move the cursor to “O
2
Sensor” and press F4 to
activate the waveform analysis of the O
2
Sensor signal voltage. As the Figure 14 shows.
d). Observe the O
2
Sensor voltage fluctuating situation.
Figure 14 O
2
Sensor voltage signal fluctuating waveform
Figure 13 O
2
Sensor electrical resistance measurement