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Exam 24: Engine Performance Service

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Question 1

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

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Question 2

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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

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Question 3

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

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

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?

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

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

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

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

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

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?

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

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

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

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

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

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?

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

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

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