Front-wheel drive axles do not change their effective length during operation
2. Fixed constant velocity joints are commonly called tripod-type joints.
3. CV-joints are referred to by position, by function, and by design
Most front-wheel drive bearings are pressed onto the wheel-hub assembly
The Rzeppa CV-joint has 6 to 10 ball bearings
CV-joints are used in front-wheel drive axles.
The front-drive axle is connected to the drive wheel hub by a short splined drive shaft
CV-joints are called constant velocity joints because their rotational speed changes with the operational angle.
Most front-drive vehicles use two rows of ball or tapered roller wheel bearings
Many front-wheel drive vehicles use sealed wheel bearings in the front hubs
11. Part-time four-wheel drive is usually disconnected by the driver when driving on pavement due to a likelihood of a driveline windup situation
12. Four-wheel drive front hubs may have automatic disconnects
Excessive noise from the transfer case could be caused by worn bearings or internal gear damage
Four-wheel drive front hubs may be plain, without any disconnects
4WD vehicles must be stopped to be shifted into four-wheel drive
A part-time transfer case may provide a neutral gear position.
A transfer case is an extra gear box behind the main transmission
Full-time four-wheel drive may have an internal differential
19. There are a minimum of two drive shafts connected to a transfer case.
Most transfer cases use drive chains
A transfer case is mounted between the transmission and the engine
The Society of Automotive Engineers (SAE) recommends specifications and practices for the automotive industry and offers terms to label the various systems of 4WD and AWD
The inability of a part-time 4WD to be shifted out of 4WD into 2WD may be caused by driveline windup (spline lock).
Universal joints or CV are used at the outer ends of the front axle shafts in a four-wheel drive vehicle to allow normal braking action.
Fuel economy may be reduced by leaving front hubs locked while driving in 2WD
26. Chain drive in a transfer case is usually found in front-wheel drive passenger cars. y
A transfer case is an extra gear box behind the main transmission.
AWD constantly provides power to front- and rear-drive axles
4WD constantly provides power to all four drive wheels.
4WD systems cannot be manually controlled.
The purpose of the interaxle differential is to compensate for differences in front-wheel and rear-wheel speeds such as when turning a comer
Limited slip allows torque to be delivered to the wheel with the least traction
Most all-wheel-drive systems give the driver the option of 2WD or 4WD.
34. A viscous coupling must be used with a center differential
Some high-performance AWD cars use a vacuum system to lock the center or rear differential.
The viscous clutch cannot be repaired, so must be replaced if it is damaged
Diagnosis of some 4WD systems may require the use of a scan tool to access (DTCs) diagnostic trouble codes.
A volt-ohmmeter may be needed to help diagnose electrical or electronic 4WD systems
All-wheel drive vehicles do not require any sort of center differential
40. 4WD means the system is permanently AWD
When shifting from 4WD Auto to 4WD Low, the vehicle must be brought to a stop
Silicone oil is used in viscous couplings because it has low shearing resistance with low volumetric change when its temperature increases.
The blinking frequency of the 4WD indicator lamp may be used to indicate a problem with an electronic system.
A slipping forward clutch may cause a delay in the shift of all forward gears
All transmissions have a throttle valve linkage that controls forced downshifts
A clunking noise during acceleration may be the result of a worn CV joint.
Engine performance can affect torque convertor clutch operation
n order to properly diagnose a transmission complaint, it is essential that you gather as much information from the customer as possible.
49. Driving a vehicle with a very low level of ATF is not harmful to the transmission
It is not important to use the recommended ATF in the transmission
51. Front-drive axle CV-joints must accommodate changes in .
effective length of drive axle
steering wheels left to right
suspension height
all of the above
To find problems in independent suspension drive axles, one must check for
excessive looseness
lack of lubrication
damaged boots
53. Constant velocity universal joints that include a slip joint may be
double offset or cross groove design
tripod design
both of the above
none of the above
54. CV-joints are used in late model cars. Technician A says they are called constant velocity joints because their rotational speed does not change with their operational angle. Technician B says all FWD and some 4WD vehicles use CV-joints on the front-drive axles. Who is correct?
A only
B only
both A and B
neither A nor B
55. All front-wheel drive automobiles have CV-joints. Technician A says most use a fixed inboard joint. Technician B says all use at least one plunging joint on each axle. Who is correct?
A nor B neither
56. Technician A says the most commonly used type of CV-joint is the ball type. Technician B says it is the Rzeppa type. Who is correct?
A ONLY
B ONLY
BOTH A AND B
NEITEHR
Technician A says the inner race of the Rzeppa CV-joint is connected to the drive axle. Technician B says the ball bearings rotate on a trunnion within the outer housing. Who is correct
BOTH A AND C
NEITHER
Technician A says the protective boot on a CV-joint prevents contamination of the joint's lubricant. Technician B says the boot prevents the joint's lubricant from being lost. Who is correct?
Technician A says most inner CV-joints are of the tripod design. Technician B says the tripod design CV-joint uses needle bearings. Who is correct?
The Rzeppa CV-joint has ball bearings.
3 to 6
6 to 10
10 to 12
13 to 15
The transfer case 2WD position
engages the four-wheel drive
ocks the transfer case differential
prevents off-road driving
should be used for dry pavement driving
62. Technician A says when the transfer case is in low, the overall gear ratio is numerically increased. Technician B says when the transfer case is in the high position, the vehicle operates in an overdrive mode due to the decrease in torque multiplication. Who is correct?
63. Universal joints or CV joints are used at the outer ends of the front axle shafts of a four-wheel drive vehicle to allow normal .
a. spring action
b. steering action
braking action
Excessive noise from the transfer case could be caused by .
low lubricant level
misaligned drive shafts
Technician A says 4WD mode in part-time four-wheel drive systems is designed to be used only when driving off-road or on slippery surfaces. Technician B says 4WD units are dangerous on bad roads. Who is correct?
Technician A says seals that are incorrectly installed can cause a leak in a transfer case. Technician B says noises in a transfer case or a differential can be caused by bad bearings. Who is correct?
Technician A says if leakage is noticed in the steering damper, a new seal can be installed. Technician B says a light film of fluid leakage is acceptable from the steering damper. Who is correct?
BOTH
Technician A says incorrect lift modifications are a common cause of abnormal handling or vibrations. Technician B says the abnormal noises can be caused by altered drive shaft operating angles due to lift modifications. Who is correct?
Technician A says an improperly adjusted shift linkage can cause problems in the shift mode sleeve. Technician B says a worn-out engine can cause problems in the shift mode sleeve. Who is correc
Technician A says a possible cause for a transfer case jumping out of gear is improperly adjusted shift " linkage. Technician B says a possible cause for a transfer case jumping out of gear is a worn or broken sliding clutch. Who is correct?
Technician A says a transfer case is an extra gear box on the back of a transmission. Technician B says a transfer case is mounted between the engine and the transmission. Who is correct?
Technician A says the purpose of a transfer case is to transfer power to an additional drive axle. Technician B says most transfer cases have two speeds that affect the overall gear ratio of the vehicle. Who is correct?
Part-time four-wheel drive
must be disconnected when driving off-road
cannot be disconnected by th e driver
is usually disconnected when driving on pavement
must be disconnected by a technician
Four-wheel drive front hubs may .
be plain, without any disconnects
have automatic disconnects
have manual disconnects
Technician A says a vacuum motor may be used to engage 4WD. Technician B says some pickups and SUVs have a viscous clutch in an AWD transfer case. Who is correct?
78. Technician A says an improperly adjusted shift linkage can cause problems in the shift mode sleeve. Technician B says a worn-out engine can cause problems in the shift mode sleeve. Who is correct?
Technician A says since petroleum jelly is sticky, it is often used to help hold parts when a transfer case is reassembled. Technician B says petroleum jelly quickly melts and mixes with the lubricant, which is why it is used to hold parts on reassembly. Who is correct?
Technician A says 4WD systems are used in cars not really intended for off- road operation. Technician B says AWD systems are used in some four-wheel drive trucks. Who is correct?
Technician A says part-time four-wheel drive systems are manually operated. Technician B says part-time four-wheel drive systems will have a variable torque split (front to rear), so may be driven on dRy pavement in 4WD. Who is correct?
Technician A says the driver has the ability to select 2WD with an AWD system. Technician B says the driver has the ability to select 2WD with a full-time four-wheel drive system. Who is correct?
B NEITEHR
Technician A says a transfer case may have a limited-slip, viscous-type clutch assembly. Technician B says a transfer case may have a multiple plate clutch assembly for limited slip. Who is correct?
Technician A says all-wheel drive vehicles spread the tractive effort to all four driving wheels. Technician B says all-wheel drive vehicles bias the driving torque to the axle that has the traction only when needed. Who is correct?
A
B
Technician A says drive line windup on a 4WD vehicle is most evident on dry pavement. Technician B says drive line windup on a 4WD vehicle is most evident on wet pavement. Who is correct?
86. When discussing an AWD system that is electronically controlled, Technician A says an electronic module is used to pulse the duty solenoid on and off. Technician B says the duty solenoid is pulsed on and off very rapidly. Who is correct?
Technician A says viscous clutch biasing sends torque to the wheel with the least traction. Technician B says it will send torque to the wheel with the greatest traction. Who is correct?
When the transfer case is in the lock position, the vehicle should be .
on dry pavement
traveling at highway speeds
on a limited traction surface
Technician A says electronically controlled systems may use sensor inputs to control the center differential for front-rear torque bias. Technician B says the Porsche PTM system uses an electronically controlled motor in the transfer case. Who is correct?
Technician A says delayed shifts using a TV assembly may be the result of poor engine performance. Technician B says low engine vacuum will cause a vacuum modulator to sense a load condition, causing delayed and harsh shifts. Who is correct?
says leaking hydraulic circuits or sticking spool valves in the valve body can result in delayed shifts or slippage. Technician B says worn planetaiy gear set members can cause delayed shifting. Who is correct?
Technician A says hydraulic problems, not linkage problems, cause delayed or missed shifts. Technician B says any engine movement can change the effective length of the shift and throttle cables and can affect the engagement of gears. Who is correct?
Technician A says throttle pedal movement or engine vacuum is an indicator of engine load. Technician B says changes in hydraulic pressure inside the transmission or transaxle are a result of engine load changes. Who is correct?
Which of the following does not sense engine vacuum?
Manifold absolute pressure sensor
Throttle position sensor
Pressure regulator valve
Modulator valve
b or c
Technician A says electrical switches are used to open and close electrical circuits. Technician B says electrical switches are used to control the operation of other devices. Who is correct?
a
b
both
neither
Technician A says identification numbers identify only the manufacturer and assembly date of the transmission or transaxle. Technician B says the shape of the oil pan is the only positive way to identify the exact design of the transmission or transaxle. Who is correct?
Which of the following is true of solenoids?
They convert electrical energy to mechanical energy
They control the flow of hydraulic fluid.
They control power flow
They control shift points
Which of the following is true of the VIN?
a. It will be found on a sticker
b. It will have barcoded information.
c. It will include build date, part number, and exact model.
d. All of the above
e. None of the above n
Technician A says it is necessary to identify any and all non-factory installed electrical accessories when inspecting a vehicle. Technician B says non-factory installed electrical accessories may cause the system to not operate properly. Who is correct?
Technician A says that any electronic problems, as indicated by fault codes retrieved by a scan tool, should be corrected before continuing with the diagnosis. Technician B says that the electronic problems will be corrected when the transmission repair is completed. Who is correct?
Technician A says that the temperature of the transmission is not important when checking ATF levels. Technician B says that all transmissions and transaxles have a dipstick. Who is correct?
. Technician A says that metal shavings collected on permanent magnet-style speed sensors may indicate an internal transmission problem. Technician B says that if the fluid is clean and only contains a small amount of residue, the transmission problem is most likely caused by something external to the transmission. Who is correct?
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