AUMT1416SEC6

A driver complains of harsh riding and the suspension height is normal. The most likely cause of this problem is:

Excessive positive caster on both front wheels.

While inspecting and measuring a front cradle on a front-wheel-drive car:

Front wheel alignment angles may be changed by a bent front cradle.

Feathering" type wear of a rear tire is likely caused by:

Improper rear wheel toe alignment.

While discussing scrub radius:

Incorrect. scrub radius may be caused by larger than specified front tires.

When reading dimensions on a unitized body chart, capital letters indicate:

Right side of the vehicle

Toe is the measured difference between the ______, and the ______.

leading edge of two tires on the same axle, trailing edge of same two tires.

While using computer wheel aligners

Setback is the angle formed by a line at 90 degrees to the vehicle centerline at the axle attachment point and a line through the left and right wheel centers.

While using computer wheel aligners:

Some wheel sensors have the capability to measure ride height and display this reading on the screen.

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

Starts the compressor and opens the rear air spring valves.

T/F: Steering wheel kickback is reduced when the SAI line intersects the true vertical tire and wheel centerline at the road surface.

True

T/F: The vertical side of the frame is called the web.​

True

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

Turn the air spring solenoid valve to the first stage.

Cupping of the outer threads could be caused by?

out of balance tire and assembly

While discussing turning radius: Technician A says incorrect turning radius may often be noted by tire squeal while cornering. Technician B says to adjust turning radius toe-out on turns, turn the inner wheel to stop. Who is correct?

A only

Technician A says excessive positive caster may cause front wheel shimmy. Technician B says excessive positive caster increases steering effort and causes harsh riding. Who is correct?

Both A and B

Unequal SAI angles on the left and right sides of the front suspension may cause:

Bump steer on a rough road.

When welding a vehicle frame crack:

Disconnect the negative battery cable before welding the crack.

When performing a self-test on a programmed ride control system:

The engine must be off and the ignition switch turned on.

While using a computer wheel aligner:

The technician may select defective suspension components from a list on the screen.

All of these statements about a programmed ride control system are true EXCEPT: a. An air spring is mounted at each corner of the vehicle. b. An electric actuator is located in each strut. c. A mode indicator light is positioned in the tachometer. d. The PRC module provides a firm ride during severe braking.

a. An air spring is mounted at each corner of the vehicle.

Excessive positive caster may cause all of these problems EXCEPT: a. Harsh ride quality. b. Excessive steering effort. c. Slow steering wheel return. d. Front wheel shimmy.

c. Slow steering wheel return

On many front suspension systems, the maximum variation between the left and right SAI is:

1 degree

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

1 millisecond

On an ESC system a normal voltage signal from a wheel position sensor is:

2.5 V

While discussing a programmed ride control (PRC) system:

A PRC system switches from the auto mode to firm mode if the vehicle accelerates with 90 percent throttle opening.

A light-duty truck with a one-piece rear axle housing and a leaf-spring rear suspension has excessive toe-out on the left rear wheel and too much toe-in on the right rear wheel. The most likely cause of this problem is:

A broken center bolt in the left rear spring.

A front-wheel-drive car has an improper toe-out on turns setting, and a visual check indicates all the steering linkage and suspension components are satisfactory. The most likely cause of this problem is:

A front strut tower that is out of position.

A pickup truck with a MacPherson strut front suspension pulls to the left. Preliminary inspection shows that the SAI is correct, but the camber of the right front wheel is -1 1/4 degrees. Technician A says a bent spindle could be the cause. Technician B says the problem may be a worn-out strut. Who is correct?

A only

A tire shows extreme wear on the outer thread. The wear is not present on the third thread and none on the center thread. Technician A says this is probably caused by too much positive camber. Technician B says this wear is a sign of incorrect toe. Who is correct?

A only

On a vehicle with a straight rear axle, the right rear tire exhibits diagonal wipe. The rear toe measurements are left 0.02 and right 1.13. Technician A says that the rear axle may be bent on the right side of the vehicle. Technician B says that the rear axle has shifted to the left. Who is correct?

A only

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 only

Technician A says the suspension switch must be turned off before raising any corner of a car with an electronic air suspension. Technician B says the ignition switch must not be turned on while any corner of a car with electronic air suspension is raised. Who is correct?

A only

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

A only

While discussing ESC system diagnosis, Technician A says the normal force signal on a scan tool indicates a measured level of road surface condition sent from the ESC module to the EBCM. Technician B says the normal force data is sent from the front and rear wheels. Who is correct?

A only

While performing a prealignment inspection: Technician A says improper front wheel bearing adjustment may affect wheel alignment angles. Technician B says worn ball joints have no effect on wheel alignment angles. Who is correct?

A only

When measuring front wheel alignment angles, to calculate the included angle on the left front wheel when the camber on this wheel is positive:

Add the camber to the SAI angle.

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

Applies the brake on one front wheel.

A vehicle with an electronic air suspension system with mechanical trim height adjustment requires front and rear trim height adjustment. Technician A says to adjust the front trim height, rotate the threaded mounting bolt in the upper end of the height sensor. Technician B says to adjust the rear trim height, loosen the attaching bolt(s) on the upper height sensor bracket and move the bracket upward or downward. Who is correct?

B only

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

B only

The owner of an older pickup says the truck has begun to "wander and shimmy" in the past few months, especially when the bed of the truck is empty. Technician A says the twin I-beam front suspension caster is probably out of spec. Technician B says the eyes of the rear leaf springs are probably worn. Who is correct?

B only

When discussing unsatisfactory steering wheel returnability: Technician A says the rack and pinion steering gear mounts may be worn. Technician B says this problem may be caused by interference between the dash seal and the steering shaft. Who is correct?

B only

When using a scan tool to perform a ride height adjustment on a vehicle dynamic suspension (VDS), Technician A says the VDS switch must be in the Off position. Technician B says if the ride height does not equal the manufacturer's specifications, the scan tool is used to command the VDS to lower or lift the vehicle to obtain the specified ride height. Who is correct?

B only

While discussing a diamond-shaped frame condition: Technician A says this condition may be caused when the vehicle is involved in a fire resulting from an accident. Technician B says this condition may be caused by towing another vehicle with the chain attached to one corner of the frame.

B only

Frame measurement is being discussed. Technician A says diagonal frame measurements should cross each other at the frame centerline. Technician B says the distance from the frame centerline to the same point on each side of the frame should be equal. Who is correct?

Both A and B

Referring to OLD Figure 10-14: Technician A says the measurement between "e" and "b" should be no more than ±1.0 in. different from the measurement between "E" and "b." Technician B says frame damage problems, such as buckling, can be determined if the measurements between points "e" and "E" are more than ±0.25 in. different than between "b" and "b." Who is correct?

Both A and B

Technician A says a dedicated bench system is used to perform unitized body measurements after medium to heavy collision damage. Technician B says a tram gauge may be used to measure the distance between the front strut towers on a unitized body. Who is correct?

Both A and B

Technician A says a torque box is positioned in front of the rear frame kickup side rails in a perimeter-type frame. Technician B says a torque box is positioned just ahead of the transmission support member in a perimeter-type frame. Who is correct?

Both A and B

Technician A says steering pull when braking may be caused by unequal SAI angles on the front suspension. Technician B says front tire tread wear may be caused by unequal SAI angles on the front suspension. Who is correct?

Both A and B

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?

Both A and B

While discussing a front suspension height that is 1 in. (2.54 cm) less than specified: Technician A says the suspension height must be correct before a wheel alignment is performed. Technician B says the lower front suspension height may be caused by worn lower control arm bushings. Who is correct?

Both A and B

While discussing frame damage: Technician A says a possible indication of frame damage is an uncentered steering wheel when driving straight ahead. Technician B says suspension alignment may be impossible if the frame is bent. Who is correct?

Both A and B

While discussing steering diagnosis: Technician A says uneven half-shaft axle lengths may cause a vehicle to pull to one side when accelerating. Technician B says abnormal toe changes can cause a vehicle to pull to one side on road irregularities. Who is correct?

Both A and B

While discussing turning radius measurement: Technician A says a bent steering arm will cause the turning radius to be out of specification. Technician B says if the turning radius is not within specification, tire tread wear is excessive while cornering. Who is correct?

Both A and B

While performing a prealignment inspection: Technician A says a prealignment inspection should include checking the vehicle interior for heavy items. Technician B says tools and other items normally carried in the vehicle should be included during an alignment. Who is correct?

Both A and B

Which of the following statements is most true regarding camber angle?

Camber can best be seen from the front of the vehicle looking towards the leading edge of the tire and wheel assembly.

When making horizontal frame measurements to determine if the frame or unibody is straight, all of the measurements should be made with reference to which one of the following?

Centerline

When diagnosing a VDS system, a U1900 DTC is obtained. This DTC indicates a defect in the:

Controller area network (CAN).

While adjusting front wheel camber and diagnosing camber-related problems:

During front wheel jounce travel, the positive camber increases.

A car with a MacPherson strut front suspension has 1.5 degree positive camber on the left front wheel and 1.5 degree negative camber on the right front wheel. The most likely cause of this problem is:

Engine Cradle/subframe shifted right

A front-wheel-drive vehicle with an independent rear suspension pulls to the right when driving straight ahead. All the front suspension alignment angles are within specifications. The most likely cause of this problem is:

Excessive toe-out on the right rear wheel.

While diagnosing front wheel toe problems:

Improper toe adjustment may cause feathered wear on the front tire treads.

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:

Increases the suspension height 1 inches

After you have completed a front end alignment, a customer returns to your shop and complains of continued vehicle drift. To correct this problem, you should:

Inspect rear wheel alignment.

While diagnosing problems related to scrub radius:

Larger than specified front tires may change the scrub radius from positive to negative.

A magnetheological shock absorber will probably most likely be found on a:

Mercedes sedan

Front wheel setback occurs when one front wheel is:

Moved rearward in relation to the opposite front wheel.

There is almost no tread left on the three center threads of a tire. Technician A says the tire has been operated under inflated. Technician B says lack tire rotation could cause this wear. Who is correct?

Neither A nor B

While discussing a front suspension system in which the right front wheel has 2 degree positive camber and the left front wheel has 1/2 degree positive camber: Technician A says when the vehicle is driven straight ahead, the steering will pull to the left. Technician B says there will be excessive wear on the inside edge of the left front tire tread. Who is correct?

Neither A nor B

While diagnosing rear axle offset and sideset:

On a semi-independent rear suspension system, worn trailing arm bushings may cause rear axle offset.

The technician has retrieved a DTC being with the letter 'P'. The 'P' means the code relates to the:

Powertrain

A vehicle has a drift to one side, camber is negative on one side and positive on the other but the cross camber is within specification and caster is within specifications. There are no adjustments available for either camber or caster. The technician suggests that the camber may be brought into specifications by:

Repositioning the cradle/subframe assembly.

When removing and replacing an air spring and shock absorber assembly on a VDS:

Retainer tabs on the lower end of the spring must be depressed to separate the spring and the shock absorber.

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

Retard the spark advance and shut off the fuel injectors.

While driving straight ahead, a front-wheel-drive car pulls to the right. The most likely cause of this problem is:

Sagged front springs and improper front wheel toe setting.

While diagnosing suspension and wheel alignment problems:

Steering angles are designed to reduce tire wear and provide directional control.

The magneto-rheological fluid in the shock absorbers or struts in an ESC system contains:

Suspended iron particles.

While diagnosing the vehicle geometric centerline and thrust line:

The front and rear wheels should be parallel to the geometric centerline.

While measuring and adjusting front wheel toe:

The front wheel toe should be checked with the front wheels straight ahead.

When using the scan tool to inflate an air spring:

The scan tool commands the air compressor on.

While diagnosing and adjusting turning radius:

When a vehicle is making a left turn, the left front wheel turns at a sharper angle than the right front wheel.

While diagnosing a diamond-frame condition and frame twist:

When frame twist occurs, the front or rear chassis does not sit level in relation to the road surface.

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

When jacking the vehicle to change a tire

A bent front cross member affects all of the following alignments EXCEPT: a. Centerline. b. Suspension. c. Axle. d. Engine.

a. Centerline

The section modulus of a frame is a measure of a frame's strength based on all of these factors EXCEPT:​ a. ​Length b. ​Height c. ​Width d. ​Thickness

a. Length

All of these statements about SAI and front spindle movement are true EXCEPT: a. When the steering wheel is turned, the front spindle movement is parallel to the road surface. b. When the SAI angle is increased, the steering wheel returning force is increased. c. The SAI angle tends to maintain the wheels in a straight-ahead position. d. Greater SAI angle is necessary on front-wheel-drive cars to provide directional stability.

a. When the steering wheel is turned, the front spindle movement is parallel to the road surface.

A magnetheological shock absorber will provide: a. easier driving effort b. All of the above c. a better ride for the passengers. d. a greater reduction of the shock.

b. All of the above

All of these statements about the vehicle thrust line and steering pull are true EXCEPT: a. Excessive toe-out on the left rear wheel moves the thrust line to the left of the vehicle centerline. b. Excessive toe-in on the right rear wheel moves the thrust line to the right of the vehicle centerline. c. If the thrust line is moved to the left of the vehicle centerline, the steering tends to pull to the right. d. Excessive toe-out on the right rear wheel causes the steering to pull to the left.

b. Excessive toe-in on the right rear wheel moves the thrust line to the right of the vehicle centerline.

All of these statements about network systems are true EXCEPT: a. A network system can be a single-wire or dual-wire system. b. Some network systems operate between 0V and 12V. c. Some vehicles have two network systems. d. A fiber-optic network system has a very high data transmission rate.

b. Some network systems operate between 0V and 12V

The "smart fluid" in a magnetheological shock:

becomes a semi-solid when magnetic field is applied.

All of these statements about a rear load-leveling suspension system are true EXCEPT: a. The On/Off switch is mounted in the vehicle trunk. b. The control module operates the compressor relay. c. If a door is open, the control module completes the lower suspension height commands. d. The rear suspension has one, non-serviceable suspension height sensor.

c. If a door is open, the control module completes the lower suspension height commands.

While diagnosing front wheel toe problems: a. The front wheels are set to a straight-ahead position on most front-wheel-drive cars. b. Driving forces tend to move the front wheels toward a toe-in position on a rear-wheel-drive car. c. Improper toe adjustment may cause feathered wear on the front tire treads. d. Sagged front springs may increase the front wheel toe-out on a short-and-long arm suspension system.

c. Improper toe adjustment may cause feathered wear on the front tire treads.

All of these statements about unitized body design are true EXCEPT: a. The frame and body are combined as one unit. b. The external frame assembly is eliminated. c. Some body members such as quarter panels do not contribute to body strength and rigidity. d. Body strength is obtained by body shape and design.

c. Some body members such as quarter panels do not contribute to body strength and rigidity

All of these statements about performing an on-demand self-test on a VDS system are true EXCEPT: a. The battery must be fully charged. b. The ignition switch must be on. c. The vehicle must be raised on a lift. d. The 4L mode must not be selected on four- wheel-drive vehicles.

c. The vehicle must be raised on a lift.

All of these statements about frame problems are true EXCEPT: a. Frame sag may be caused by overloading the vehicle. b. Frame sag may be caused by the use of equipment for which the frame was not designed. c. Frame buckle may be caused by using a snowplow on the front of the vehicle. d. A diamond-shaped frame may be caused by operating the vehicle on extremely rough terrain.

d. A diamond-shaped frame may be caused by operating the vehicle on extremely rough terrain.

Which of the following statement would be considered FALSE regarding caster angles? a. Caster angles can be easily determined by visually inspecting the tire and wheel assembly from the front of the vehicle. b. Improper caster angle will wear the tire tread quickly. c. Caster angles may be forward or rearward of the tire and wheel assembly when compared to the vehicle's center line. d. Both A and B.

d. Both A and B

All of these statements about front wheel toe change during wheel jounce and rebound are true EXCEPT: a. If one front wheel toes in and the opposite front wheel toes out during front wheel jounce and rebound, the tie rod height is unequal. b. If both front wheels toe in or toe out a small, equal amount during front wheel jounce and rebound, the tie rods are parallel to the lower control arms. c. The improper toe change during front wheel jounce and rebound may cause bump steer. d. Improper toe change during front wheel jounce and rebound may be caused by a worn upper strut mount.

d. Improper toe change during front wheel jounce and rebound may be caused by a worn upper strut mount.

Which of the following makes this statement true? Measurement points of a frame or unibody using a tram gauge are: a. Seam notches. b. Calculated by computer. c. Based on a vertical datum plane. d. Manufacturer's specified frame openings.

d. Manufacturer's specified frame openings.

All these statements about air springs, shock absorbers, and struts are true EXCEPT: a. Air springs can be mounted separately from the shock absorbers. b. Air springs can be mounted over the front and rear struts. c. Some struts contain a solenoid actuator that controls strut firmness. d. Some air suspension systems have seven driver selectable operating modes.

d. Some air suspension systems have seven driver selectable operating modes.

The customer says that sometimes her car suddenly swerves to one side on a bump. All of the following could cause this problem EXCEPT: a. Loose steering gear. b. Worn tie rods. c. Sagging front springs. d. Steering gear lash adjustment.

d. Steering gear lash adjustment

A B1143 code has been retrieved. What does the first '1' mean? a. It is the first code present in the system b. It is the first digit of a four digit code c. It refers to the first fault found in the body system. d. The code is manufacturer specific

d. The code is manufacturer specific

To sense the distance to the vehicle in front, an adaptive cruise control system uses: a. A video camera. b. A short-range radar signal. c. A digital camera. d. A Long-range radar signal.

d. a long-range radar signal

A P0441 DTC is retrieved. What does the '0' mean?

indicates the code is an on-board-diagnostic code

The last three digits of a DTC indicates:

the system or component with the fault

A tire has excessive wear at each edge of the thread. This could be caused by:

underinflation