Exam 3: History of on Board Diagnostics Obd

On an OBD II vehicle, the MIL will turn on when:

OBD II systems have been developed to utilize a common set of diagnostic test modes that are accessible with a generic diagnostic scan tool.

How many OBD II warm-up cycles must occur for a stored DTC to be erased successfully?

What are the three objectives of OBD II?

The two main categories of OBD II monitors are the:

What are some of the features of the universal OBD II DLC incorporated into all manufacturers' cars and light trucks?

What SAE standard determines where automotive manufacturers can place the DLC?

Emission controls on modern vehicles produced in the United States are installed to:

OBD II systems are highly efficient and only illuminate the malfunction indicator light when an emissions failure has occurred that will raise emission levels above 1.5 times the FTP levels.

How and why could a vehicle fail an OBD test but pass a tailpipe emissions test?

Of what type of emission malfunction does the on-board diagnostics emission monitoring system (OBD II system) alert the driver?

Technician A says that the DLC on an OBD II vehicle has 18 pins. Technician B says that the pin assignment for the DLC on an OBD II vehicle has not changed since 1996. Who is correct?

OBD II systems are highly efficient and only illuminate the malfunction indicator light (MIL) when an emissions failure has occurred that will raise emission levels 50 percent above the FTP levels.

What did the Clean Air Act (CAA) of 1990 require vehicles sold in the United States to be equipped with?

What is the relationship between an OBD II drive cycle and an OBD II trip?

Under the OBD II regulations, what did all vehicle manufacturers have to do for all components and systems related to the engine management and emission control systems?

A drive cycle refers to a trip in which the operating parameters required for the PCM to run OBD II emissions-related monitors have been met.

What is the objective of the on-board diagnostic (OBD) alert system (MIL)?

Can the emission control system be modified by the vehicle's owner or by a repair facility?

On an OBD II vehicle, when the ignition key is on and the engine is not running, the MIL should: