Question 1

What is a closed loop system?

Accepted Answer

Closed loop systems are often referred t

Question 2

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

Accepted Answer

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

Question 3

Describe the driving procedure that will allow the OBD-II system to complete all monitors.

Accepted Answer

Engine must run continuously throughout

Question 4

The ____________________ sensor tells the PCM that detonation is occurring in the cylinders.

Accepted Answer

The answer of The ____________________ sensor tells the PCM that...

Question 5

Technician A tests an MAF sensor with a scan tool by watching for erratic changes in flow while the engine idles. Technician B checks an MAF sensor by tapping it lightly with the handle of a screwdriver while watching the waveform on a lab scope. 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

Which of the following is NOT a type of actuator?

Accepted Answer

A) solenoid 
B) relay 
C) magnetic pulse generator 
D) electric motor 
A) solenoid 
B) relay 
C) magnetic pulse generator 
D) electric motor

Question 7

Two technicians are discussing OBD-II monitor readiness status. Technician A says that the vehicle must be driven through a drive cycle that includes several minutes of idle, low-speed cruise, medium-speed cruise, and deceleration before all monitors can be performed. Technician B says all monitors can be performed in five minutes of fast idling. 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 8

A MAP sensor with a varying frequency output can be tested with a(n)______.

Accepted Answer

A) voltmeter 
B) ohmmeter 
C) DMM with a duty cycle function 
D) DMM with a frequency function 
A) voltmeter 
B) ohmmeter 
C) DMM with a duty cycle function 
D) DMM with a frequency function

Question 9

Normal throttle position sensor signal voltage at closed throttle [idle] is ____________________ volt.

Accepted Answer

The answer of Normal throttle position sensor signal voltage at...

Question 10

Drivability problems that do not set a DTC are diagnosed by ____________________ strategy.

Accepted Answer

symptom-ba

Question 11

For most actuators, the circuit driver in the PCM applies a ground to the circuit to turn the actuator on and removes the ground to turn the actuator off.

Accepted Answer

A) True 
 B)False

Question 12

Identify some common applications of magnetic pulse generators in automobiles.

Accepted Answer

Vehicle speed sensor

Question 13

A conventional oxygen sensor needs to be heated to ________ degrees Fahrenheit before it can produce a usable signal.

Accepted Answer

A) 500 
B) 750 
C) 1,000 
D) 1,200 
A) 500 
B) 750 
C) 1,000 
D) 1,200

Question 14

A vehicle with a DTC for an engine coolant temperature out of range code is being tested. The serial data stream shows the coolant temperature to be 198 degrees Fahrenheit. When the technician tests the resistance between the ETC terminals, he finds infinite resistance. The specifications call for 20 to 40 ohms at 200 degrees Fahrenheit. After the ECT is replaced and the code is erased, the system runs normally and the code and MIL illumination do not reoccur. How is this possible?

Accepted Answer

A) There was excessive air in the cooling system; when the ECT sensor was removed, the trapped air bled out 
B) The ETC code was set by a loose connection where the harness meets the ECT terminals; disconnecting and reconnecting the plug essentially fixed the problem 
C) The problem is an intermittent electrical fault; it will eventually reoccur 
D) When the ECT failed, the PCM substituted a nominal ECT value that allowed the engine to run in limp home mode; the substituted value was displayed by the scan tool 
A) There was excessive air in the cooling system; when the ECT sensor was removed, the trapped air bled out 
B) The ETC code was set by a loose connection where the harness meets the ECT terminals; disconnecting and reconnecting the plug essentially fixed the problem 
C) The problem is an intermittent electrical fault; it will eventually reoccur 
D) When the ECT failed, the PCM substituted a nominal ECT value that allowed the engine to run in limp home mode; the substituted value was displayed by the scan tool

Question 15

What is a freeze-frame?

Accepted Answer

The PCM takes a snapshot of the activity

Question 16

On some vehicles, actuators can be tested with a scan tool by accessing output state control (OSC)or output test mode (OTM).

Accepted Answer

A) True 
 B)False

Question 17

An accelerator pedal position sensor (APP)is used on vehicles equipped with ______.

Accepted Answer

A) electronic throttle control 
B) cruise control 
C) torque converter clutch (TC
C)  
D) All the answers are correct. 
A) electronic throttle control 
B) cruise control 
C) torque converter clutch (TC
C)  
D) All the answers are correct.

Question 18

Mode 6 data show the results of the monitor diagnostic tests.

Accepted Answer

A) True 
 B)False

Question 19

What is an OBD-II drive cycle?

Accepted Answer

The OBD-II drive cycle is operating cond

Question 20

Which of the following does NOT use a magnetic pulse generator [PM generator]?

Accepted Answer

A) wheel speed sensor 
B) throttle position sensor 
C) vehicle speed sensor 
D) crankshaft position sensor 
A) wheel speed sensor 
B) throttle position sensor 
C) vehicle speed sensor 
D) crankshaft position sensor

Exam 25: Detailed Diagnosis and Sensors

What is a closed loop system?

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

Describe the driving procedure that will allow the OBD-II system to complete all monitors.

The ____________________ sensor tells the PCM that detonation is occurring in the cylinders.

Technician A tests an MAF sensor with a scan tool by watching for erratic changes in flow while the engine idles. Technician B checks an MAF sensor by tapping it lightly with the handle of a screwdriver while watching the waveform on a lab scope. Who is correct?

Which of the following is NOT a type of actuator?

A MAP sensor with a varying frequency output can be tested with a(n)______.

Normal throttle position sensor signal voltage at closed throttle [idle] is ____________________ volt.

Drivability problems that do not set a DTC are diagnosed by ____________________ strategy.

For most actuators, the circuit driver in the PCM applies a ground to the circuit to turn the actuator on and removes the ground to turn the actuator off.

Identify some common applications of magnetic pulse generators in automobiles.

A conventional oxygen sensor needs to be heated to ________ degrees Fahrenheit before it can produce a usable signal.

What is a freeze-frame?

On some vehicles, actuators can be tested with a scan tool by accessing output state control (OSC)or output test mode (OTM).

An accelerator pedal position sensor (APP)is used on vehicles equipped with ______.

Mode 6 data show the results of the monitor diagnostic tests.

What is an OBD-II drive cycle?

Which of the following does NOT use a magnetic pulse generator [PM generator]?

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