Deck 11: Computer Controlled Suspension Systems

Question 1

A Magneride suspension system has magneto-rheological fluid in the shock absorbers.

Answer 1

True

Question 2

While discussing a programmed ride control (PRC)   system:

A) The PRC system switches to the firm mode if  lateral acceleration exceeds 0:25 g.
B) The mode indicator light in the tachometer is  illuminated in the plush ride mode.
C) A PRC system switches from the auto mode to f irm mode if the vehicle accelerates with  90 percent throttle opening.
D) The brake system pressure must be 300 psi ( 2,068 kPa) before this mode change occurs.

Answer 2

C

Question 3

All of these statements about a rear load-leveling  suspension system are true EXCEPT:

A) If a door is open, the control module completes  the lower suspension height commands.
B) The rear suspension has one, non-serviceable  suspension height sensor.
C) The On/Off switch is mounted in the vehicle  trunk.
D) The control module operates the compressor  relay.

Answer 3

A

Question 4

Technician A says that in an electronic air suspension system with the ignition switch turned off for over 1 hour, the compressor run time is limited to 5 minutes for raise vehicle commands on the front springs. Technician B says if the brake pedal is applied when driving the car, raise vehicle commands are completed immediately. Who is correct?

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

Question 5

When the brakes are applied with the doors closed on a vehicle with an electronic air suspension system, the air suspension module ignores all requests from the height sensors.

Question 6

CAN is currently the standard communication protocol.

Question 7

To sense the distance to the vehicle in front, an  adaptive cruise control system uses:

A) A Long-range radar signal
B) A video camera
C) A short-range radar signal
D) A digital camera

Question 8

When removing an air spring valve with air pressure in the spring, rotate this valve to the fully released position.

Question 9

Technician A says that in an electronic air suspension system if the engine is running, the brake pedal applied, and a door is open, lower vehicle commands are completed immediately. Technician B says that in an electronic air suspension system if the engine is running and a command cannot be completed in 3 minutes, the suspension warning lamp is illuminated. Who is correct?

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

Question 10

Computer-controlled suspension systems reduce body sway during fast acceleration.

Question 11

On an automatic air suspension system, the front air spring and strut assemblies contain an actuator that varies strut firmness.

Question 12

In an electronic air suspension system, the control module operates all of these components EXCEPT:

A) Air spring valves
B) Compressor
C) Height sensors
D) Air vent valve

Question 13

If an electrical fault occurs in the Stabilitrak® system, STABILITY REDUCED is displayed in the driver information center (DIC) .

Question 14

To force air into an air spring on an electronic air suspension system, the compressor must be running and the air spring valve must be de-energized.

Question 15

When both front and rear air springs require filling on a vehicle with an electronic air suspension system, fill the rear springs first.

Question 16

All these statements about air springs, shock absorbers,and struts are true EXCEPT:

A) Some air suspension systems have seven driver  selectable operating modes.
B) Air springs can be mounted separately from the s hock absorbers.
C) Air springs can be mounted over the front and  rear struts.
D) Some struts contain a solenoid actuator that  controls strut firmness.

Question 17

Technician A says that some networks contain terminators located at both ends of the network. Technician B says terminators are usually positioned inside some of the network computers. Who is correct?

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

Question 18

A hard fault code indicates a fault that occurs and then disappears.

Question 19

After installing an air spring, there should only be one or two creases in the spring membrane.

Question 20

Technician A says adaptive cruise control system uses a long-range radar sensor. Technician B says the lane departure warning system uses a video camera to measure lane markings. Who is correct?

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

Question 21

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

Question 22

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

Question 23

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

Question 24

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

Question 25

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

Question 26

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

Question 27

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

Question 28

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.

Question 29

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.

Question 30

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

Question 31

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

Question 32

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

Question 33

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

Question 34

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

Question 35

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

Question 36

In a electronic suspension system, the accelerometer contains:

A) A Hall Effect switch
B) A mercury switch
C) A silicon diaphragm
D) LEDs

Question 37

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

Question 38

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

Question 39

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

Question 40

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

Question 41

On a CAN bus system multiple networks on the vehicle can be linked together by what?

Question 42

In an electronic air suspension system, if the doors are closed, the brake pedal is released, and the vehicle is travelling at 65 mph, what action is taken by the chassis control module when a command is received from the rear suspension sensor to lower the vehicle?

Question 43

On an electronic suspension control system, the chassis control module senses vehicle lift and dive from what other vehicle system?

Question 44

In a rear load-leveling air suspension system, how do you disable the system?

Question 45

List the conditions when the On/Off switch in an electronic air suspension system must be turned off.

Question 46

When a front or rear air spring is being installed, what precautions must be taken with regard to the air bag?

Question 47

How does the control module on an electronic suspension control system sense vehicle lift, dive, and roll?

Question 48

With regard to an engine running in an electronic air suspension system, describe the conditions required for the control module to turn on continually the air suspension warning lamp.

Question 49

Describe two other electronic systems that are operated by the same module on a Stabilitrak® system.

Question 50

An electronic rotary height sensor contains what type of switch?

Question 51

In an electronic air suspension system, what action is taken by the chassis control module if a command is received from the rear suspension sensor to lower the vehicle if the engine is running with a door open, and the control module receives a lower vehicle command from the height sensor?

Question 52

In an electronic air suspension system, two hours after the ignition switch is turned off, which commands are completed and which are ignored?

Question 53

How many height sensors are mounted on the front suspension in an electronic air suspension system?

Question 54

If a vehicle equipped with an electronic suspension control system is accelerating rapidly at wide open throttle, what mode does the system enter?

Question 55

For a vehicle with an electronic air suspension system, discuss the precaution that must be taken before any corner of the vehicle is raised and explain the results if this precaution is not observed.

Question 56

Explain how air is forced into an air spring to raise the suspension trim height on an electronic air suspension system.

Question 57

Explain how a vehicle stability control system maintains vehicle stability.