CATALYTIC CONVERTER BASICS
CONVERTER EFFICIENCY
There were many changes that took place with the implementation of OBD II but
the change having the greatest affect on diagnostics was the Readiness Monitors.
During operation, the on-board computer (PCM), continually tests itself and all emission components reporting to it.
This monitoring process assures each component or system is operating within a pre-programmed set of parameters.
The Catalyst Monitor utilizes pre and post converter oxygen sensors to continually check the oxygen storage capacity
of the converter. During normal operation, the pre-cat O2 or Sensor 1 should display a rapidly changing voltage signal
ranging from approximately 0V to 1V. The post-cat O2 will be flat line displaying little or no variation in it’s signal.
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