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Definitions
• DLC: Data Link Connector
The 16-cavity connector on the vehicle
that allows communication between the
computer system and the Scan Tool.
• Drive Cycle
A set of driving procedures that,
when met, provide the Enabling
Criteria for the I/M Monitors to run
and complete their diagnostic tests.
• Control Modules
Individual computers that operate
and monitor different systems in
the vehicle. Control Modules vary
depending on manufacturer.
• MIL: Malfunction Indicator Lamp
The vehicle’s “Check Engine”
warning light that activates
when a DTC is stored.
• DTC: Diagnostic Trouble Code
A code stored in the computer
system’s memory, which helps to
identify the fault condition that is
causing the MIL to activate.
• Freeze Frame Data
Operating conditions that are
stored when a DTC is stored.
• PID - Parameter Identification Data
Data returned by the vehicle’s
Control Modules to the Scan Tool.
I/M Monitors
Inspection and Maintenance diagnostic tests that the Control Modules
perform on specific sub-systems of the vehicle.
There are two types of Monitors:
• Continuous: Monitors that
perform tests all the time while
the engine is running.
• Non-Continuous: Monitors that require
specific operating conditions to be met
during a Drive Cycle in order for the
Monitors to run their testing sequences.
Note: Not all Monitors are
supported by all vehicles.
Gasoline Engine Monitors
Continuous
MIS - Misfire
FUEL - Fuel System
CCM - Comprehensive Components
Non-Continuous
CAT - Catalyst
HCAT - Heated Catalyst
EVAP - Evaporative System
AIR - Secondary Air System
O2S - Oxygen Sensors
HTR - Oxygen Sensor Heater
EGR - EGR System
Diesel Engine Monitors
Continuous
MIS - Misfire
FUEL - Fuel System
CCM - Comprehensive Components
Non-Continuous
HCCAT - NMHC Catalyst
NCAT - NOx Aftertreatment
BP - Boost Pressure System
EGS - Exhaust Gas Sensor
PM - PM Filter
EGR - EGR System
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