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Massachusetts Vehicle Check - Mass08 Management Module ...

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Non Commercial<br />

Chapter 3 – OBD II Inspection<br />

Introduction<br />

Commencing October 1, 2008, the emission test will be performed prior to the safety<br />

test. We now have an OBD II system that is used on all 1996 and newer passenger cars and<br />

light-duty trucks. This system continuously monitors the vehicle’s emissions performance<br />

and, in case of a malfunction, triggers a light (the MIL) to warn the driver, while setting a<br />

code (DTC) indicating the problem. OBD II provides us with an emission testing system that<br />

rides with the vehicle at all times.<br />

Main topics:<br />

• Drive Cycle<br />

• Monitor<br />

• Trips<br />

• How do monitors become Ready?<br />

• Mode 6<br />

• Enabling Criteria<br />

• MIL Operation<br />

• DTC (code) Set Parameters<br />

• DTC Numbering<br />

<strong>Massachusetts</strong> <strong>Vehicle</strong> <strong>Check</strong><br />

Ch. 3 - 1

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