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14 Glossary of Terms & Abbreviations
ABS – Anti-Lock Brake System
AC – Alternative Current
ADAS -- Advanced Driver Assistance Systems
AFS – Adaptive Front-lighting System
CAN – Controller Area Network
Communication Protocol – Allows different systems and sensors in a vehicle to communicate.
There are currently five Protocols:
• CAN Bus
• J1850 VPW
• ISO 9141-2
• J1850 PWM
• ISO 14230 KWP
DC – Direct Current
DLC – Data Link Connector
The 16-cavity connector on the vehicle that allows communication between the computer system and
the diagnostic tool.
DPF – Diesel Particulate Filter
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.
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.
Freeze Frame Data – A digital representation of engine and/or emissions system conditions present
when a fault code was recorded.
Generic Code – A DTC that applies to all OBD2 compliant vehicles.
I/M – Instant Messaging
I/M Readiness – An indication of whether or not a vehicle’s emissions-related system are operating
properly and are ready for Inspection and Maintenance testing.
IMMO – Immobilizer
LCD – Liquid Crystal Display
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