Deck 47: Advanced Emissions and On-Board Diagnostics Odb

Question 1

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

A) mode 1 includes parameter information data (PID).
B) mode 2 defines the O₂ sensor monitoring parameters.
C) mode 3 allows scan tools to access stored emission-related codes (DTCs).
D) mode 4 allows the scan tool to clear emission-related diagnostic information from the computer's memory.

Answer 1

B

Question 2

12)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:

A) type A
B) type B
C) type C
D) type D

Answer 2

A

Question 3

19)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.

Answer 3

comprehensive component

Question 4

9)Which of the following is LEAST-Likely a noncontinuous monitor?

A) Engine misfire monitor
B) Catalyst efficiency monitor
C) Secondary air injection monitor
D) Fuel system monitor

Question 5

10)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?

A) A only
B) B only
C) Both A and B
D) Neither A nor B

Question 6

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

Question 7

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

Question 8

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

Question 9

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

Question 10

8)A(n) ____ requires the ignition switch to be off for a period of time.

A) indicator
B) monitor
C) trip
D) valve

Question 11

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

Question 12

2)OBD II requires each manufacturer to use the same language between the computer, sensors, actuators, and scan tool.

Question 13

13)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) A only
B) B only
C) Both A and B
D) Neither A nor B

Question 14

15)Which of the following statements is LEAST-Likely true?

A) NO_X is formed when nitrogen and O₂ combine in the combustion chamber at sustained high temperatures in excess of 2,500⁰F.
B) When NO_X is combined with HCs in the presence of sunlight, smog is formed.
C) Deposits are more common on engines with low mileage.
D) A lean air-fuel ratio can increase NO_X when it causes preignition.

Question 15

11)All of the following statements are true EXCEPT:

A) the fuel system monitor operates continuously when the fuel system is in closed loop.
B) the heated oxygen sensor monitor (HO₂S) changes the injector pulse width while it checks the upstream O₂ sensor to see that its oscillating frequency is fast enough.
C) O₂ sensors are monitored even before closed loop.
D) a pre-catalyst sensor is called S₀ and a post-cat sensor is called sensor 1 (S₁).

Question 16

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

A) 6
B) 7
C) 8
D) 9

Question 17

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

Question 18

20)____________________ 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.

Question 19

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

A) trip
B) drive cycle
C) switch ratio
D) heat soak

Question 20

3)The MIL located on the dash display must illuminate if inferred emissions exceed 0.5 times the federal standard.

Question 21

21)OBD II provides common standards to be shared among all makes of vehicles. List four of the standards, as prepared by the Society of Automotive Engineers (SAE).

Question 22

24)What is meant by the term type A misfire ?

Question 23

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

Question 24

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

Question 25

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