Question 1

What is the principal function of the OBD-II system?

Accepted Answer

To monitor the functioning of

Question 2

All OBD-II vehicles have a minimum of ____________________ oxygen sensors.

Accepted Answer

The answer of All OBD-II vehicles have a minimum of...

Question 3

To read flash codes on an OBD I Chrysler-built vehicle ______.

Accepted Answer

A)  connect terminals A and B on the DLC with a jumper wire 
B)  turn the rotary switch on the PCM counter clockwise 3 clicks 
C)  connect the E1 and TE1 terminals on the DLC 
D)  turn the ignition key on and off three times in five seconds, ending in on 
A)  connect terminals A and B on the DLC with a jumper wire 
B)  turn the rotary switch on the PCM counter clockwise 3 clicks 
C)  connect the E1 and TE1 terminals on the DLC 
D)  turn the ignition key on and off three times in five seconds, ending in on

Question 4

What is a type B misfire?

Accepted Answer

A type B misfire is a misfire that occur

Question 5

Diagnostic trouble codes are being discussed. Technician A says a P0442 is a manufacturer's code and means different things, depending on what manufacturer built the car. Technician B says that a P0304 code is a universal code that means the same thing no matter what manufacturer built the car. 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 6

The MIL light should illuminate when the ignition switch is turned to the run position [engine not running] and go out within a few seconds after the engine is started.

Accepted Answer

A) True 
 B)False

Question 7

A phaser is used to _____.

Accepted Answer

A)  advance or retard camshaft timing 
B)  measure crankshaft position 
C)  advance or retard ignition timing 
D)  kill Klingons 
A)  advance or retard camshaft timing 
B)  measure crankshaft position 
C)  advance or retard ignition timing 
D)  kill Klingons

Question 8

Oxygen sensor monitors are being discussed. Technician A says the system monitors the sensor response time as the system cycles lean-rich-lean. Technician B says that at certain times the monitor varies the fuel delivery and checks for heated oxygen sensor response. 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 9

Higher-octane fuels are easier to ignite and burn faster than low-octane fuel.

Accepted Answer

A) True 
 B)False

Exam 24: Engine Performance Systems

What is the principal function of the OBD-II system?

All OBD-II vehicles have a minimum of ____________________ oxygen sensors.

To read flash codes on an OBD I Chrysler-built vehicle ______.

What is a type B misfire?

The MIL light should illuminate when the ignition switch is turned to the run position [engine not running] and go out within a few seconds after the engine is started.

A phaser is used to _____.

Oxygen sensor monitors are being discussed. Technician A says the system monitors the sensor response time as the system cycles lean-rich-lean. Technician B says that at certain times the monitor varies the fuel delivery and checks for heated oxygen sensor response. Who is correct?

Higher-octane fuels are easier to ignite and burn faster than low-octane fuel.

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