6. PM filter
• OBD II Monitor Readiness Status
OBD II systems must indicate whether or not the vehicle's PCM's
monitor system has completed testing on each component.
Components that have been tested will be reported as “Ready”, or
“Complete”, meaning they have been tested by the OBD II system.
The purpose of recording readiness status is to allow inspectors to
determine if the vehicle's OBD II system has tested all the
components and/or systems.
• OBD II Definitions
Power-train Control Module (PCM) - OBD II terminology for the on-
board computer that controls engine and drive train. Malfunction
Indicator Light (MIL) - Malfunction Indicator Light (Service Engine
Soon, Check Engine) is a term used for the light on the instrument
panel.
OBD II Drive Cycle - A specific mode of vehicle operation that
provides vehicle to the “ready” condition.
Freeze Frame Data - When an emissions related fault occurs, the
OBD II system not only sets a code but also records a snapshot of
the vehicle operating parameters to help in identifying the problem.
• OBD II Modes of Operation
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