Almost all new vehicles have on-board diagnostic capabilities, so it is critical for technicians-in-training to be well-grounded in the technology. This video explains the general operation and many of the fine points of on-board diagnostic systems. With an overview of the evolution of OBD technology, the program illustrates the different systems within a car-brakes, electrical, steering, etc.-that an OBD-II system monitors and troubleshoots. Viewers will receive valuable instruction in diagnostic trouble codes, high input failure, low input failure, types of sensors, and using a digital thermometer to verify specific codes. Dealing with older vehicles and reverting to low-tech methods are also explored. Correlates to all National CTE Organizational Standards (including the provisions of the Perkins Act).

Encoded with permission for digital streaming by Infobase on Aug. 09, 2006. Learn360 is distributed by Infobase for Films for the Humanities & Sciences, Cambridge Educational, Meridian Education, and Shopware.

On-Board Diagnostics (1:07) -- Operation of On-Board Diagnostics (OBD) (2:03) -- Evolution of OBD (3:13) -- Diagnostic Trouble Codes (3:28) -- Verifying Trouble (2:02) -- On-Board Diagnosis Without a Scan Tool (3:56).