Innova 3100 Owner's Manual page 36

Learning More
COMPUTER ENGINE CONTROLS
Enabling Criteria - Each Monitor is designed to test and monitor
the operation of a specific part of the vehicle's emissions system
(EGR system, oxygen sensor, catalytic converter, etc.). A specific
set of "conditions" or "driving procedures" must be met before the
computer can command a Monitor to run tests on its related
system. These "conditions" are known as "Enabling Criteria." The
requirements and procedures vary for each Monitor. Some
Monitors only require the ignition key to be turned "On" for them to
run and complete their diagnostic testing. Others may require a set
of complex procedures, such as, starting the vehicle when cold,
bringing it to operating temperature, and driving the vehicle under
specific conditions before the Monitor can run and complete its
diagnostic testing.
Monitor Has/Has Not Run - The terms "Monitor has run" or
"Monitor has not run" are used throughout this manual. "Monitor
has run," means the PCM has commanded a particular Monitor to
perform the required diagnostic testing on a system to ensure the
system is operating correctly (within factory specifications). The
term "Monitor has not run" means the PCM has not yet
commanded a particular Monitor to perform diagnostic testing on
its associated part of the emissions system.
Trip - A Trip for a particular Monitor requires that the vehicle is
driven in such a way that all the "Enabling Criteria" for the Monitor
to run and complete its diagnostic testing are met. The "Trip Drive
Cycle" for a particular Monitor begins when the ignition key is
turned "On." It is successfully completed when all the "Enabling
Criteria" for the Monitor to run and complete its diagnostic testing
are met by the time the ignition key is turned "Off." Since each of
the eleven monitors is designed to run diagnostics and testing on a
different part of the engine or emissions system, the "Trip Drive
Cycle" needed for each individual Monitor to run and complete
varies.
OBD 2 Drive Cycle - An OBD 2 Drive Cycle is an extended set of
driving procedures that takes into consideration the various types
of driving conditions encountered in real life. These conditions may
include starting the vehicle when it is cold, driving the vehicle at a
steady speed (cruising), accelerating, etc. An OBD 2 Drive Cycle
begins when the ignition key is turned "On" (when cold) and ends
when the vehicle has been driven in such a way as to have all the
"Enabling Criteria" met for all its applicable Monitors. Only those
trips that provide the Enabling Criteria for all Monitors applicable to
the vehicle to run and complete their individual diagnostic tests
qualify as an OBD 2 Drive Cycle. OBD 2 Drive Cycle requirements
vary from one model of vehicle to another. Vehicle manufacturers
set these procedures. Consult your vehicle's service manual for
OBD 2 Drive Cycle procedures.
34 OBD 2