Question 1

A catalytic converter may be tested with a ______.

Accepted Answer

A)  pyrometer 
B)  rubber mallet 
C)  vacuum gauge 
D)  all answers are correct 
A)  pyrometer 
B)  rubber mallet 
C)  vacuum gauge 
D)  all answers are correct

Question 2

While discussing catalytic converter diagnosis, Technician A says a delta temperature test should be conducted. Technician B says a good converter is evident by low amounts of CO2 in the tailpipe exhaust. Who is correct?

Accepted Answer

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

Question 3

Technician A checks a PCV valve by sucking air through it with his mouth. Technician B checks a PCV valve by removing the valve from the grommet in the valve cover and placing his finger over the end of the valve to check for vacuum. Who is correct?

Accepted Answer

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

Question 4

The OBD-II EGR system monitor tests the functioning of the EGR system by opening the EGR valve while monitoring the change in ______.

Accepted Answer

A)  STFT 
B)  EGR outlet temperature 
C)  MAP voltage 
D)  all answers are correct 
A)  STFT 
B)  EGR outlet temperature 
C)  MAP voltage 
D)  all answers are correct

Question 5

The first time the OBD-II system monitor detects a fault in the system, a ___________________ DTC is set. This will not cause the MIL light to illuminate and will self-erase if the monitor passes on the next trip.

Accepted Answer

The answer of The first time the OBD-II system monitor...

Question 6

Excessively high CO emissions may be caused by a ______.

Accepted Answer

A)  lean air/fuel mixture 
B)  missing air filter 
C)  higher than normal fuel pressure 
D)  all answers are correct 
A)  lean air/fuel mixture 
B)  missing air filter 
C)  higher than normal fuel pressure 
D)  all answers are correct

Question 7

Which of the following may result from too little EGR flow?

Accepted Answer

A)  The engine may overheat 
B)  The engine may detonate 
C)  The engine may emit an excessive amount of NOX 
D)  All answers are correct 
A)  The engine may overheat 
B)  The engine may detonate 
C)  The engine may emit an excessive amount of NOX 
D)  All answers are correct

Question 8

A catalytic converter can be tested by measuring the inlet and outlet temperatures.

Accepted Answer

A) True 
 B)False

Question 9

Technician A says cylinder misfiring causes a significant increase in HC emissions. Technician B says a dirty air filter may cause high CO emissions. Who is correct?

Accepted Answer

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

Exam 34: Emission Control Diagnosis and Service

A catalytic converter may be tested with a ______.

While discussing catalytic converter diagnosis, Technician A says a delta temperature test should be conducted. Technician B says a good converter is evident by low amounts of CO2 in the tailpipe exhaust. Who is correct?

Technician A checks a PCV valve by sucking air through it with his mouth. Technician B checks a PCV valve by removing the valve from the grommet in the valve cover and placing his finger over the end of the valve to check for vacuum. Who is correct?

The OBD-II EGR system monitor tests the functioning of the EGR system by opening the EGR valve while monitoring the change in ______.

The first time the OBD-II system monitor detects a fault in the system, a ___________________ DTC is set. This will not cause the MIL light to illuminate and will self-erase if the monitor passes on the next trip.

Excessively high CO emissions may be caused by a ______.

Which of the following may result from too little EGR flow?

A catalytic converter can be tested by measuring the inlet and outlet temperatures.

Technician A says cylinder misfiring causes a significant increase in HC emissions. Technician B says a dirty air filter may cause high CO emissions. Who is correct?

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While discussing catalytic converter diagnosis, Technician A says a delta temperature test should be conducted. Technician B says a good converter is evident by low amounts of CO₂ in the tailpipe exhaust. Who is correct?