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Chapter 3 Automotive Test
75
There are several types of oxygen sensors: titanium oxygen, zirconium oxygen, and front & rear dual oxygen
sensors; the signal switching frequency is about 1 Hz, and it can only work when the temperature is normal. The
voltage is high when the mixture is thick, and the voltage is low when the mixture is thin.
Use a BNC to banana cable, one end is connected to channel 1 of the oscilloscope, the other end is grounded with
the black plug, and the red connector is connected to the signal line (pre-oxygen) of the oxygen sensor with a
needle. Use a BNC to banana cable, connect one end to channel 2 of the oscilloscope, ground the black plug on the
other end, and use a needle to connect the red connector to the signal line of the oxygen sensor (rear oxygen, if
there is no rear oxygen sensor, no test is required). If you want to measure current, connect the BNC end of the
current clamp to channel 3 of the oscilloscope, and clamp the clamp on the heating wire.
Use ATO oscilloscope to test the oxygen sensor, the specific operation is shown in Figure 3-20:
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