Creator
OBDII/EOBD scanner
9
Currently, there are eleven OBD II Readiness
Monitors (or/ I/M Monitors) defined by the U.S.
Environmental Protection Agency (EPA). Not
all monitors are supported by all vehicles and
exact number of monitors in any vehicle
depends on the motor vehicle manufacturer’s
emissions control strategy.
Continuous Monitors – Some of the vehicle
components or systems are continuously tested
by the vehicle’s OBD II system, while others
are tested only under specific vehicle
operating
conditions.
The
continuously
monitored components listed below are always
ready:
1) Misfire
2) Fuel System
3) Comprehensive Components (CCM)
Once the vehicle is running the OBD II system
is continuously checking the above components,
monitoring key engine sensors, watching for
engine misfire, and monitoring fuel demands.
Non-Continuous
Monitors
–
Unlike
the
continuous monitors, many emissions and engine
system components require the vehicle to be
operated under specific conditions before the
monitor is ready. These monitors are termed
non-continuous monitors and are listed below:
1) EGR System
