Loading ...
Loading ...
Loading ...
FX Series Full System Scan Tool
8
2.4
OBD II Readiness Monitors
An important part of a vehicle’s OBD II system is the
Readiness Monitors, which are indicators used to find out
if all of the emissions components have been evaluated
by the OBD II system. They are running periodic tests on
specific systems and components to ensure that they are
performing within allowable limits.
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 the 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:
Misfire
Fuel System
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.
Loading ...
Loading ...
Loading ...