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# VVC AUTO 85.5 - Smog Technician - Level 1 - Zirconium o2 sensor_testing

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### VVC AUTO 85.5 - Smog Technician - Level 1 - Zirconium o2 sensor_testing

1. 1.  Passing Results  Minimum Voltage (Artificially Full Lean)  0V – 175mV  Maximum Voltage (Artificially Full Rich)  800mV – 1V  Rise Time (Snap Throttle)  < / = 100mS (from 175mV – 800mV) Test O2S with DSO Propane enrichment tool, DSO minimum voltage = 0 - 175mV maximum = 800 - 1000mV rate of change = < 100 mS (175mV - 800 mV)
2. 2. RPM O2S STFT IPW TPS MAF
3. 3. = 50mV
4. 4. = 50mV = 175mV
5. 5. = 50mV = 175mV = 800 mV
6. 6. = 50mV = 175mV = 800 mV Fail!
7. 7.  Using a DSO, a technician tests an O2 sensor for “rise time” by snapping the throttle and freezing the frame. The technician has set up the DSO time scale for 200mS per division, with 5 subdivisions each. When measured at the specified voltage levels, the rise time between the cursors was 3 subdivisions. What is the measured time difference, and does this O2 sensor pass the rise time test? The time difference is 120ms and it does not pass the test