Deck 10: Modern Systems That Interact With the Engine Control System

Question 1

On a Northstar engine equipped with Electronic Throttle Control, the throttle position sensor (TPS)has ______ channels.

A)One
B)Two
C)Three
D)Four

Answer 1

B

Question 2

Which sensor does the PCM use to determine misfire?

A)Vehicle speed sensor
B)Camshaft sensor
C)Crankshaft sensor
D)Oxygen sensor

Answer 2

C

Question 3

Idle learn procedures on a Gen III PCM are being discussed. Technician A says a scan tool must be used to perform the idle learn. Technician B says the procedure must be performed any time a code is present. Who is correct?

A)Technician A only
B)Technician B only
C)Both A and B
D)Neither A nor B

Answer 3

D

Question 4

How does the PCM disable a cylinder on an engine with a variable displacement system?

A)The PCM turns off the fuel injector on selected cylinders and allows the intake and exhaust valves to operate normally.
B)The PCM turns off the fuel injector on selected cylinders and energizes an oil solenoid that results in both the intake and exhaust valves staying open in order to reduce pumping losses.
C)The PCM turns off the fuel injector on selected cylinders and energizes an oil solenoid that results in both the intake and exhaust valves staying closed in order to reduce pumping losses.
D)The PCM keeps the fuel injectors energized continuously on selected cylinders in order to reduce the volume of air that those cylinders can bring in.

Question 5

Torque management is being discussed. Technician A says torque reduction is performed to apply the brakes during hard acceleration.  Technician B says torque reduction is performed to prevent overstress of powertrain components.Who is correct?

A)Technician A only
B)Technician B only
C)Both A and B
D)Neither A nor B

Question 6

During what vehicle operation mode does regenerative braking take place?

A)Acceleration
B)Deceleration
C)Idle
D)Wide open throttle

Question 7

Which statement about menu-driven information and control systems is NOT correct?

A)The 348 Ω and 3.65 K Ω resistors are wired in parallel
B)As the coolant warms, the voltage drop across sensor decreases as measured by the PCM
C)As the coolant warms, the voltage drop across the resistors within the PCM decreases
D)When the temperature reaches 160 degrees, the PCM switches the resistor circuit

Question 8

Northstar TPS sensors are being discussed. Technician A says the sensors are not adjustable. Technician B says the sensors are self adjusting. Who is correct?

A)Technician A only
B)Technician B only
C)Both A and B
D)Neither A nor B

Question 9

Complete this sentence: The KS must report a detonation event that lasts over _______ milliseconds for _______ continuous cycles.

A)3; 99.99
B)5; 99.99
C)99.99; 3
D)none of the above

Question 10

How many ignition coils are used on a Northstar engine equipped with COP ignition?

A)1
B)8
C)4
D)6

Question 11

On a Northstar engine equipped with Electronic Throttle Control, the accelerator position sensor (APP)has ______ channels.

A)One
B)Two
C)Three
D)Four

Question 12

A Chevrolet Malibu with the BAS system is being discussed. Technician A says that this vehicle has a combination alternator/starter assembly that replaces the traditional alternator and which can belt drive the crankshaft following an auto stop of the engine. Technician B says that this vehicle has a traditional 12-volt starter that can turn the crankshaft by engaging the flywheel. Who is correct?

A)Technician A only
B)Technician B only
C)Both A and B
D)Neither A nor B

Question 13

The PCM in a Northstar engine controls all of the following EXCEPT:

A)Automatic transaxle shifting
B)Generator output regulation
C)Traction control
D)Antilock brakes

Question 14

Chevrolet Volt technology is being discussed. Technician A says that during EV mode, the vehicle is propelled by the electric motor generator. Technician B says that during ER mode, the vehicle is propelled by the electric motor generator. Who is correct?

A)Technician A only
B)Technician B only
C)Both A and B
D)Neither A nor B

Question 15

A HV battery in a Chevrolet Volt contains 288 cells, each rated at 3.6 volts. Technician A says that the voltage output of this battery is 1036.8 volts (288 x 3.6). Technician B says that a HV battery control module regulates the HV battery's output to a relatively stable 345.6 volts by electronically recombining cells in series and parallel combinations to achieve this output. Who is correct?

A)Technician A only
B)Technician B only
C)Both A and B
D)Neither A nor B

Question 16

The Northstar "engine metal overtemp mode" is being discussed. Technician A says the PCM disables the fuel injectors to disable the cylinders. Technician B says the PCM disables one bank of cylinders when the engine temperature reaches 270 degrees F. Who is correct?

A)Technician A only
B)Technician B only
C)Both A and B
D)Neither A nor B

Question 17

Which of theses statements about secondary  oxygen sensors is NOT correct?

A)The sensor uses a bias voltage of 450 millivolts
B)The sensor operates differently than the primary sensor
C)The sensor is used to verify the effectiveness of the catalytic converter
D)Both A and B are correct

Question 18

Close-coupled catalytic converters are being discussed. Technician A says they are mounted towards the rear of the vehicle. Technician B says they reach operating temperature more quickly than conventional converters. Who is correct?

A)Technician A only
B)Technician B only
C)Both A and B
D)Neither A nor B

Question 19

GM flywheel alternator systems are being discussed. Technician A says the system uses an electric motor generator (EMG). Technician B says the system operates on 42 volts all of the time. Who is correct?

A)Technician A only
B)Technician B only
C)Both A and B
D)Neither A nor B

Question 20

Which of the following statements is NOT true about a crankshaft learn procedure on a Gen III PCM?

A)The procedure must be performed anytime the PCM is replaced
B)The procedure must be performed anytime the battery is disconnected
C)The procedure must be performed anytime the crankshaft is replaced
D)The procedure must be performed anytime the CKP sensor is replaced