Deck 24: Engine Performance Service

Question 1

Technician A says Type A diagnostic trouble codes are emissions related and are detected during the first trip.Technician B says Type B diagnostic trouble codes are also emissions related but require two trips to set a hard code.Who is correct?

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

Answer 1

C

Question 2

The sensor and output status data stored when a DTC is set is called ______.

A)snap shot data
B)freeze frame data
C)mode 6 data
D)failure record

Answer 2

B

Question 3

The SAE J2012 standards specify that all DTCs will have a _________-_________ alphanumeric numbering and lettering system.

Answer 3

five-digit

Question 4

Spark plugs are used to ignite the air-fuel mixture in the combustion chamber.

Question 5

Which of the following is NOT a way in which a monitor can perform a test?

A)passive
B)continuous
C)active
D)nonintrusive

Question 6

Trouble codes are being discussed.Technician A says that the first time the system detects a fault, a pending code is set.Technician B says that a pending code will turn on the MIL light.Who is correct?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 7

The ____________________ is turned on if emissions increase _________ over the federal test parameter (FTP) for that vehicle.

Question 8

The malfunction indicator light (MIL) comes on if emissions increase 100% over the federal test parameter.

Question 9

There is no air flow through the PCV valve when the engine is idling.

Question 10

Which of the following is NOT a part of OBD II comprehensive monitoring?

A)catalytic converter operation
B)fuel delivery control
C)exhaust gas recirculation
D)fuel system pressure

Question 11

The main purpose of OBD II is for detecting and testing of malfunctions that can affect emissions.

Question 12

The signal that alerts the misfire monitor that a misfire may be occurring is provided by the:

A)MAP sensor
B)knock sensor.
C)downstream HO₂S sensor.
D)crankshaft position sensor.

Question 13

Technician A says Type B misfires are emissions-threatening misfires.Technician B says Type A misfires are catalyst-damaging misfires.Who is correct?

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

Question 14

The third digit of a DTC indicates whether the code is an SAE or manufacturer-specific code.

Question 15

Technician A says fuel trim means the making of slight adjustments to the fuel delivery to keep the engine operating efficiently.Technician B says if the fuel system requires no correction, then short-term and long-term fuel trims will read 0%.Who is correct?

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

Question 16

DTCs can be current codes, pending codes, or___________ codes.

Question 17

Which of the following types of DTCs in OBD-II allow scan tools to access freeze frame data?

A)Type C
B)Type D
C)Type A
D)None of the answers are correct

Question 18

Technician A says enabling criteria defines the criteria that must be met before the vehicle will enter closed loop.Technician B says enabling criteria defines the criteria that must be met in order for a monitor test to be completed.Who is correct?

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

Question 19

The ____________ _________ monitor is a diagnostic test that is designed to check all input and output circuits for the ECM.

Question 20

____________ DTCs are not emissions related, do not store freeze frames, and do not generally cause any warning lamp to illuminate.