Question 1

The OBD II test strategies compare sensor inputs to one another during a rationality test.

Accepted Answer

A) True 
 B)False

Question 2

Technician A says that the conventional oxygen sensor produces a fluctuating high/low voltage signal. Technician B says an air/fuel ratio sensor produces a more constant output signal voltage. Who is correct?

Accepted Answer

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

Question 3

The air/fuel ratio sensor (AFS) circuit can be measured directly with a digital multimeter with accuracy.

Accepted Answer

A) True 
 B)False

Question 4

What is an EEPROM, and how does it differ from older versions?

Accepted Answer

The answer of What is an EEPROM, and how does...

Question 5

Technician A says that when a DTC is cleared from the PCM memory, the system readiness monitors are also cleared. Technician B says that after an emissions repair is completed, the DTCs stored should be cleared from the PCM. Who is correct?

Accepted Answer

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

Question 6

What is the major difference in the air/fuel sensor operation over the conventional oxygen sensor?

Accepted Answer

The answer of What is the major difference in the...

Question 7

Why would an air/fuel ratio sensor be used instead of a conventional oxygen sensor?

Accepted Answer

The answer of Why would an air/fuel ratio sensor be...

Question 8

Mass air flow sensor voltage corresponds to:

Accepted Answer

A)  engine load and crankshaft speed 
B)  throttle opening and engine load 
C)  engine and vehicle speed 
D)  engine load and camshaft speed

Question 9

What is the CAN protocol, and how is it standardized?

Accepted Answer

The answer of What is the CAN protocol, and how...

Question 10

What sensor has the wide range air/fuel ratio sensor (AFS) taken the place of?

Accepted Answer

The answer of What sensor has the wide range air/fuel...

Question 11

The air/fuel ratio sensor produces what type of output signal?

Accepted Answer

A)  a square wave signal. 
B)  a fluctuating high/low voltage signal. 
C)  both A and B 
D)  a continuous signal that varies with the oxygen content of the exhaust stream

Question 12

If the malfunction indicator light is on and a DTC P0131 is stored for O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1), what is the most likely cause for this code to be set?

Accepted Answer

A)  EGR valve stuck open 
B)  EVAP purge solenoid stuck open 
C)  vacuum leak 
D)  high fuel pressure

Question 13

Many of today's computers utilize a technology that allows for electronically erasable programmable read-only memory (EEPROM).

Accepted Answer

A) True 
 B)False

Question 14

What is each one (1) or zero (0) in a data stream is referred to as?

Accepted Answer

The answer of What is each one (1) or zero...

Question 15

The coolant temperature sensor is a negative temperature coefficient sensor; therefore:

Accepted Answer

A)  as temperature increases, resistance increases 
B)  as temperature increases, the amplitude of the sine wave increases 
C)  as temperature increases, resistance decreases 
D)  as temperature decreases, the amplitude of the sine wave increases

Question 16

What is the circuit over which serial data is transmitted called?

Accepted Answer

The answer of What is the circuit over which serial...

Exam 5: Computers and Input Sensors

The OBD II test strategies compare sensor inputs to one another during a rationality test.

Technician A says that the conventional oxygen sensor produces a fluctuating high/low voltage signal. Technician B says an air/fuel ratio sensor produces a more constant output signal voltage. Who is correct?

The air/fuel ratio sensor (AFS) circuit can be measured directly with a digital multimeter with accuracy.

What is an EEPROM, and how does it differ from older versions?

Technician A says that when a DTC is cleared from the PCM memory, the system readiness monitors are also cleared. Technician B says that after an emissions repair is completed, the DTCs stored should be cleared from the PCM. Who is correct?

What is the major difference in the air/fuel sensor operation over the conventional oxygen sensor?

Why would an air/fuel ratio sensor be used instead of a conventional oxygen sensor?

Mass air flow sensor voltage corresponds to:

What is the CAN protocol, and how is it standardized?

What sensor has the wide range air/fuel ratio sensor (AFS) taken the place of?

The air/fuel ratio sensor produces what type of output signal?

If the malfunction indicator light is on and a DTC P0131 is stored for O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1) , what is the most likely cause for this code to be set?

Many of today's computers utilize a technology that allows for electronically erasable programmable read-only memory (EEPROM).

What is each one (1) or zero (0) in a data stream is referred to as?

The coolant temperature sensor is a negative temperature coefficient sensor; therefore:

What is the circuit over which serial data is transmitted called?