Zirconium O2 Sensor Testing

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 DSOPropane enrichment tool, DSOminimum voltage = 0 - 175mV

maximum = 800 - 1000mVrate of change = < 100 mS (175mV - 800 mV)

RPM

O2S

STFT

IPW

TPS

MAF

= 50mV

= 50mV

= 175mV

= 50mV

= 175mV

= 800 mV

= 50mV

= 175mV

= 800 mV

Fail!

Test Question! 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