Question 1

A heavy parcel is placed in the trunk of a vehicle with a rear load-leveling system after the ignition switch has been turned off for 30 minutes. Technician A says the suspension module will quickly restore the rear suspension height to the normal trim height. Technician B says the suspension module will not restore the rear suspension height to the normal trim height until the engine is started. Who is correct?
A) A only
B) B only
C) Both A and B
D) Neither A nor B

Accepted Answer

Technician A is correct. Load-leveling systems are designed to quickly adjust the suspension height to maintain a level ride height, even when heavy cargo is added to the trunk. The suspension module uses sensors to detect changes in ride height and adjusts the suspension accordingly. The engine does not need to be started for this system to function. Technician B is incorrect.

Question 2

Technician A says during air spring inflation, the vehicle should be positioned on a frame-mounted lift so the wheels are dropped downward. Technician B says during air spring inflation, some of the vehicle weight must be applied to the suspension system. Who is correct?
A) A only
B) B only
C) Both A and B
D) Neither A nor B

Accepted Answer

The answer of Technician A says during air spring inflation,...

Question 3

Technician A says the suspension control switch must be turned on when servicing electronic air suspension components. Technician B says the suspension control switch must be turned on when lifting the front of the car with a floor jack. Who is correct?
A) A only
B) B only
C) Both A and B
D) Neither A nor B

Accepted Answer

The suspension control switch should be turned off, not on, when servicing electronic air suspension components or lifting the vehicle to prevent unintended adjustments or damage.

Question 4

To deflate an air spring prior to removal of the spring:
A) Energize the vent solenoid in the air compressor
B) Turn the air spring solenoid valve to the second stage
C) Disconnect the air line from the air spring
D) Turn the air spring solenoid valve to the first stage

Accepted Answer

The answer of To deflate an air spring prior to...

Question 5

In an ESC system with magneto-rheological fluid in  the shock absorbers or struts, the control module can  vary the shock absorber firmness in:
A) 1 0 milliseconds
B) 1 millisecond
C) 1 second
D) 10 seconds

Accepted Answer

A magneto-rheological fluid is a smart fluid that can change its viscosity when subjected to a magnetic field. This property allows for rapid adjustments in the firmness of the shock absorbers or struts. In an ESC system, the control module needs to be able to make quick adjustments to the suspension to maintain vehicle stability. A 1 millisecond response time is the best choice as it allows for near-instantaneous adjustments to be made to the shock absorber firmness. Options A, C, and D are too slow for effective ESC system operation.

Question 6

In a rear load-leveling air suspension system, when does the control module energize the compressor relay?

Accepted Answer

The answer of In a rear load-leveling air suspension system,...

Question 7

In some traction control systems if the control module  senses drive wheel spin, the first action taken by the  control module is to:
A) Apply the brake on the non-spinning drive wheel
B) Retard the spark advance and shut off the fuel  injectors
C) Apply the brakes on both non-drive wheels
D) Apply the brake on the spinning drive wheel

Accepted Answer

The answer of In some traction control systems if the...

Question 8

All of these statements about network systems are  true EXCEPT:
A) Some network systems operate between 0V and 1 2V.
B) Some vehicles have two network systems.
C) A fiber-optic network system has a very high data   transmission rate.
D) A network system can be a single-wire or dual wire  system.

Accepted Answer

None of the other statements are false, but statement A is false because network systems operate with varying voltage levels depending on the specific system.

Question 9

The magneto-rheological fluid in shock absorbers or struts in an electronic suspension control system contains:
A) Power steering fluid
B) Commercial grade hydraulic fluid
C) 75w-90
D) Suspended iron particles.

Accepted Answer

The magneto-rheological fluid in shock absorbers or struts in an electronic suspension control system contains suspended iron particles. This fluid is designed to change its viscosity in response to an applied magnetic field, providing precise and rapid adjustments to the suspension system. Power steering fluid, commercial grade hydraulic fluid, and 75w-90 are not components of magneto-rheological fluid.

Question 10

To provide stability control, the electronic brake and traction control module (EBTCM) uses input signals from a lateral accelerometer and a:
A) Front height sensor
B) Rear height sensor
C) Rear chassis position sensor
D) Yaw rate sensor

Accepted Answer

The yaw rate sensor is necessary for stability control as it measures the rotation of the vehicle around its vertical axis. This information, combined with input from the lateral accelerometer, allows the EBTCM to detect and correct oversteer and understeer situations. The height sensors and chassis position sensor have no direct impact on stability control.

Question 11

Technician A says some rear load-leveling suspension systems have the capability to maintain the proper rear suspension height individually on each side of the vehicle. Technician B says this type of system has one rear suspension height sensor. Who is correct?
A) A only
B) B only
C) Both A and B
D) Neither A nor B

Accepted Answer

Technician A is correct because some advanced rear load-leveling suspension systems can indeed adjust each side of the vehicle independently to maintain proper height, accommodating uneven loads or conditions. Technician B is incorrect because a system capable of independently adjusting each side typically uses more than one sensor to accurately measure and adjust the suspension height on each side.

Question 12

Technician A says electronic suspension control system operation may be affected by low battery voltage. Technician B says on an electronic suspension control system defects represented by a DTC with a U prefix must be repaired before proceeding with further diagnosis or service. Who is correct?
A) A only
B) B only
C) Both A and B
D) Neither A nor B

Accepted Answer

Both technicians are correct. Low battery voltage can affect the operation of electronic suspension control systems, and defects represented by a DTC with a U prefix must be repaired before further diagnosis or service.

Question 13

When the input sensor signals indicate the vehicle is beginning to swerve sideways on a vehicle with a Stabilitrak® system, the EBTCM prevents the swerving action by:
A) Applying one of the rear brakes
B) Increasing the strut firmness
C) Applying one of the front brakes
D) Decreasing the rear suspension height

Accepted Answer

When the input sensor signals indicate the vehicle is beginning to swerve sideways, the Stabilitrak® system applies one of the front brakes to keep the vehicle from swerving out of control.

Question 14

What do you have to do to remove an air spring valve from an air spring?

Accepted Answer

The answer of What do you have to do to...

Question 15

When a four-wheel-drive vehicle with an automatic ride control (ARC) system is operating in four-wheel drive at 15 mph, the suspension module:
A) Increases the suspension height 1 inches
B) Decreases the suspension height 2 inches
C) Switches the air springs to the firm mode
D) Increases the suspension height 2 inches

Accepted Answer

The suspension module of a four-wheel-drive vehicle with an automatic ride control (ARC) system increases the suspension height by 2 inches when operating in four-wheel drive at 15 mph.

Question 16

In a electronic suspension system, the accelerometer contains:
A) A Hall Effect switch
B) A mercury switch
C) A silicon diaphragm
D) LEDs

Accepted Answer

The answer of In a electronic suspension system, the accelerometer...

Question 17

To increase the rear trim height in an electronic air s uspension system, the control module:
A) Stops the compressor and opens the rear air spring  valves.
B) Starts the compressor and opens the rear air  spring valves.
C) Starts the compressor and opens the vent valve
D) Starts the compressor and closes the rear air  spring valves

Accepted Answer

Starting the compressor will increase the air pressure in the system, and opening the rear air spring valves will allow the air to flow into the rear suspension, increasing the trim height.

Question 18

Technician A says some automatic air suspension systems have rotary height sensors. Technician B says rotary height sensors contain a Hall Effect element. Who is correct?
A) A only
B) B only
C) Both A and B
D) Neither A nor B

Accepted Answer

Both technicians are correct. Some automatic air suspension systems do use rotary height sensors, and these sensors do contain a Hall Effect element.

Question 19

When servicing a vehicle with an air suspension system, the air suspension switch must be turned OFF:
A) When jacking the vehicle to change a tire
B) When lifting the vehicle for any reason
C) When performing services to the suspension system.
D) All of the above

Accepted Answer

The air suspension switch must be turned OFF in all of the listed scenarios to prevent unintentional inflating or deflating of the air suspension system, which could cause damage or compromise safety.

Question 20

On a vehicle with a stability control system, if icy road  conditions cause the vehicle to begin swerving sideways,  the stability control module:
A) Applies the brakes on both front wheels
B) Applies the brake on one front wheel
C) Applies the brake on one front wheel and the  opposite rear wheel
D) Applies the brakes on both rear wheels

Accepted Answer

The stability control system applies the brake on one front wheel to counteract the swerving and help the driver maintain control of the vehicle.

Quiz 11: Computer Controlled Suspension Systems

Technician A says during air spring inflation, the vehicle should be positioned on a frame-mounted lift so the wheels are dropped downward. Technician B says during air spring inflation, some of the vehicle weight must be applied to the suspension system. Who is correct?

Technician A says the suspension control switch must be turned on when servicing electronic air suspension components. Technician B says the suspension control switch must be turned on when lifting the front of the car with a floor jack. Who is correct?

To deflate an air spring prior to removal of the spring:

In an ESC system with magneto-rheological fluid in the shock absorbers or struts, the control module can vary the shock absorber firmness in:

In a rear load-leveling air suspension system, when does the control module energize the compressor relay?

In some traction control systems if the control module senses drive wheel spin, the first action taken by the control module is to:

All of these statements about network systems are true EXCEPT:

The magneto-rheological fluid in shock absorbers or struts in an electronic suspension control system contains:

To provide stability control, the electronic brake and traction control module (EBTCM) uses input signals from a lateral accelerometer and a:

Technician A says some rear load-leveling suspension systems have the capability to maintain the proper rear suspension height individually on each side of the vehicle. Technician B says this type of system has one rear suspension height sensor. Who is correct?

Technician A says electronic suspension control system operation may be affected by low battery voltage. Technician B says on an electronic suspension control system defects represented by a DTC with a U prefix must be repaired before proceeding with further diagnosis or service. Who is correct?

When the input sensor signals indicate the vehicle is beginning to swerve sideways on a vehicle with a Stabilitrak® system, the EBTCM prevents the swerving action by:

What do you have to do to remove an air spring valve from an air spring?

When a four-wheel-drive vehicle with an automatic ride control (ARC) system is operating in four-wheel drive at 15 mph, the suspension module:

In a electronic suspension system, the accelerometer contains:

To increase the rear trim height in an electronic air s uspension system, the control module:

Technician A says some automatic air suspension systems have rotary height sensors. Technician B says rotary height sensors contain a Hall Effect element. Who is correct?

When servicing a vehicle with an air suspension system, the air suspension switch must be turned OFF:

On a vehicle with a stability control system, if icy road conditions cause the vehicle to begin swerving sideways, the stability control module: