Exam 47: Advanced Emissions and On-Board Diagnostics Odb

The misfire that would MOST-Likely cause the fuel system to revert to open loop because the misfire would result in more O₂ in the exhaust is:

During a(n) ____________________, the engine must enter closed loop and all of the specified trip monitors must operate.

While having a discussion, Technician A says that a typical type B misfire monitor would allow about 8%-10% random misfiring before setting a pending code and recording the operating conditions (PIDs) in a freeze frame. Technician B says a type B misfire monitor would only allow about 2%-3% random misfirings. Who is correct?

A catalyst damaging code, or type A code, is never emissions related.

What is meant by the term type A misfire ?

Which of the following statements is LEAST-Likely true?

Never blow shop air into the evaporative system or the fuel filler neck.

A(n) ____________________ occurs every time the engine cools off and temperature rises at least 40⁰F.

What is the difference between diagnostic test modes 7 and 8?

All of the following statements are true EXCEPT:

The term MOST-Likely used to describe the speed of O₂ sensor oscillations between rich and lean is:

All of the following statements about diagnostic test modes are true EXCEPT:

Mode ____ displays vehicle information, including the VIN and verification of correct software installation and assurance that it has not been altered.

A(n) ____________________ monitor is a continuous monitor that looks at electrically controlled emission devices, sensors, and actuators that are not tested by other OBD II monitors.

____________________ are readings displayed on the scan tool that tell whether any or all of the OBD II monitors have been completed since the KAM was last cleared.

When an electronic problem occurs in a circuit that the computer senses or controls, a DTC is stored in the computer's ____________________.

The objective of OBD II is to detect exhaust and evaporative emissions that exceed the Federal Test Procedure (FTP) by 0.5 times.

While having a discussion, Technician A says that the term "continuous" means a monitor check is taking place when requested by the computer when the key is on or the engine is running. Technician B says that description is of a noncontinuous monitor. Who is correct?

OBD II DTCs have five characters, a letter followed by four numbers. What do the characters represent?

What are some of the items that you would test when diagnosing a vehicle that has failed an emissions test?