All-Wheel Drive

When fully applied, the NVG-246 multi-plate friction clutch assembly is capable of transmitting a maximum of how much torque to the front drive axle assembly?

Up to 400 ft/lb of torque Up to 600 ft/lb of torque Up to 800 ft/lb of torque Up to 1200 ft/lb of torque

A viscous coupling utilized in a full-time transfer case is designed to lock up and deliver power to the axle with traction when the rate of slippage between the front and rear axles approaches what percentage?

2% 6% 10% 12%

In a viscous coupling, if the fluid temperature remains below 93.3 ° C (200 ° F), what state does the special silicone liquid maintain?

The liquid immediately thickens due to shearing action. The liquid remains thin, allowing no slippage. The liquid remains thick, resulting in a locked AWD condition. The liquid remains thin, allowing slip to occur without torque transfer.

How many separate speed sensors are mounted on the NV-246 electronic transfer case?

Two sensors (Front and Rear output) Three sensors (Vehicle Speed, Front Output, Rear Output) Four sensors (One on each output shaft, one on input, one VSS) Only one sensor (the VSS)

What is the main purpose of four-wheel drive (4WD) and all-wheel drive (AWD) systems?

To increase vehicle speed during off-road driving. To eliminate the need for a differential lock. To increase traction on slippery road surfaces. To equalize the torque split between the front and rear axles.

In the auto industry, what condition typically defines an All-Wheel Drive (AWD) system?

The system must always be manually engaged by the driver. The system must be part-time and disengage entirely above 50 mph. The system is permanently engaged or automatically engaging four-wheel drive. The system requires manual locking hubs on the front wheels.

A vehicle requires the driver to manually engage the system when extra traction is needed. This system is typically classified as what type of drive?

Full-Time Four-Wheel Drive All-Wheel Drive (AWD) Part-Time Four-Wheel Drive Viscous Biasing Unit Drive

What is the purpose of the transfer case in any four-wheel or all-wheel drive vehicle?

To provide a second gear reduction to increase top speed. To automatically shift the transmission based on traction loss. To divide the power coming from the transmission between the front and rear wheels. To lock the front axle shafts together when reversing.

What component must be added to a conventional rear-wheel drive vehicle to create a four-wheel drive system that directs engine power to both the front and rear wheels?

A torque converter A center differential A manual transfer case A propeller shaft

The three major types of four-wheel drive systems are part-time, full-time, and all-wheel drive. What dictates which type of transfer case is required for a vehicle?

The type of front drive axle used (semi-floating or full-floating). The housing material (cast iron, aluminum, or magnesium). Each system requires its own unique transfer case. The required maximum transfer case torque capacity.

What action must the driver take to disengage the front wheels from the drive axle when a vehicle is equipped with manual locking hubs?

Shift the transfer case into 2H and wait for the front axle to disengage automatically. Turn the locking hub to the "FREE" or unlocked position. Turn the hub to the "LOCK" position and shift the transfer case into 4L. Stop the vehicle completely and back up one to two metres.

What action is required to unlock automatic locking hubs after operating the vehicle in four-wheel drive?

Simply shifting the transfer case back into 2H. Driving forward slowly while turning the steering wheel sharply. Completely stopping the vehicle, shifting out of four-wheel drive, and backing the vehicle up one to two metres (three to six feet). Applying the clutch brake while shifting into neutral.

In a gear type transfer case operating in 2H position, why do the front drive high gear and the front drive low gear rotate, even though no power is transmitted through them to the front output shaft?

They are hydraulically locked to the rear output shaft. They are in constant mesh with the idler gear and input gear. The front output shaft is manually locked to the rear output shaft. The 4WD clutch is moved toward the input gear.

What is the final component in the path of power for the rear wheels when a gear type transfer case is operating in 2H (two-wheel drive high range)?

The input gear. The range clutch. The rear output shaft. The rear drive low gear.

To achieve power transmission to the front wheels in 4H position (four-wheel drive high range) in a gear type transfer case, which two components must engage?

The range clutch must lock the rear drive low gear and the 4WD clutch must lock the rear output shaft. The range clutch must lock the rear output shaft and the 4WD clutch must lock the rear drive low gear. The range clutch must move toward the input gear, and the 4WD clutch must move toward the front drive high gear. The idler gear must lock to the front drive high gear.

Which component, driven by the front drive high gear, transfers torque directly to the front axle assembly in the 4H position?

The rear drive low gear The idler gear The front output shaft The range clutch

To create the 4L range in a gear type transfer case, the range clutch locks the rear drive low gear to the rear output shaft, and the 4WD clutch locks the front drive low gear to which component?

The input gear The idler shaft The front output shaft The range shift hub

What is the fundamental characteristic of Full-Time Transfer Cases regarding driver engagement?

They are manually engaged only when the vehicle is stopped. They are not engaged and disengaged by the driver; all four wheels are driven whenever the vehicle is moving. They are automatically engaged only when the vehicle is in 4L. They are engaged using special locking hubs.

Why were full-time transfer cases originally developed?

To allow the use of a simple gear-type transfer case. To eliminate the need for a front drive axle. To prevent wheel spin at the axle with the least amount of traction. To provide deep reduction gearing for heavy off-road use.

When a vehicle with a full-time transfer case turns a corner, what is the required function of the transfer case to prevent driveline binding?

The front axle must be temporarily locked out. It must allow the front and rear drive axles to turn at different speeds. It must utilize a 4WD clutch to lock the front and rear output shafts together. It must ensure the wheels on the inside and outside of the turn make the same arc.

What component may be incorporated into a full-time transfer case to allow the front and rear drive axles to turn at different speeds?

A locking hub system A differential or a viscous coupling. A planetary reduction gear set only A clutch brake assembly

What is the purpose of the center differential in an AWD system?

To provide a second torque reduction in 4L. To compensate for rotational speed differences between the front and rear wheel axles generated during turning. To provide the locking force for the viscous coupling. To transfer all torque to the rear axle under normal driving.

When one of the tires in an AWD vehicle loses grip and keeps spinning, why is the center differential alone typically insufficient to maintain traction?

The bevelled gear mechanism cannot withstand high torque loads. The planetary gearing creates a 1:1 ratio under slip. Its design characteristics are such that it is not able to transmit the traction to the rest of the tires gripping the road surface. The viscous coupling fluid remains thin below 200 ° F.

To limit the rotational differences between the front and rear axles in a full-time center differential, the system must have a mechanism, which in the source example is described as a:

Centrifugal locking dog clutch. Permanent magnet motor lock. Hydraulically operated multiple plate clutch. Manually operated locking hub system.

In the hydraulically operated multiple plate clutch used in an AWD center differential, the clutch is typically controlled by outputs from which electronic module?

Powertrain Control Module (PCM) Transmission Control Module (TCM) outputs to a duty solenoid. Automatic Transfer Case Control Module (ATCM) Vehicle Speed Sensor (VSS)

During normal straight-ahead driving, the multiple plate clutch in an AWD center differential is in which state?

Fully engaged, creating a rigid AWD condition. Released, allowing the center differential to compensate for speed differences. Partially engaged, providing 6% slip resistance. Locked by the duty solenoid.

When a slipping condition causes the hydraulic multiple plate clutch to engage in the center differential, what is the resulting mechanical condition?

The differential gears lock, but the axles remain unlocked. The front axle is disengaged, and power is sent only to the rear. The front and rear axles are directly connected, producing a rigid AWD condition. The planetary carrier freewheels, stopping torque transfer.

In an AWD system with a viscous coupling, what occurs if the front wheels begin to slip?

The rear differential is unlocked, removing power from the rear wheels. The speed sensor sends a signal to the ATCM to manually engage the front axle. The fluid coupling locks up and delivers power to the rear axle. The front axle locking mechanism is automatically disengaged.

All-wheel drive vehicles, such as those equipped with a viscous coupling unit, are typically designed for which purpose?

Heavy-duty off-road use and shallow water fording. Improved traction on slippery road surfaces such as wet, ice, or snow. Constant velocity operation at extreme drive angles. Eliminating the need for a clutch and transmission.

What component is required in a part-time transfer case (Model 241) to ensure the proper transfer of power from the rear output shaft to the front output shaft?

A planetary gear set. A chain drive. A viscous coupling. A mechanical linkage.

How is the NV-246 electronic transfer case encoder motor controlled by the Automatic Transfer Case Control Module (ATCM)?

Via a dedicated hydraulic pressure circuit. With a pulse width modulated (PWM) circuit provided by the ATCM. By a mechanical cable connected directly to the shift switch. Through an electric solenoid that locks the sector shaft.

The NV-246 transfer case encoder motor consists of a permanent magnet (PM) DC motor and which other component assembly?

A centrifugal weight system. A gear reduction gear assembly. A planetary carrier lock. A multi-plate friction clutch.

What is the purpose of the transfer case motor lock, which is part of the motor assembly?

To engage the front axle clutch pack immediately upon startup. To prevent the transfer case from changing mode/gear positions or popping out of position. To provide the necessary torque to the front propeller shaft. To allow the encoder motor to rotate only clockwise.

In the NV-246 system, when the transfer case is placed in 2HI,4HI, or 4LO, what is the state of the motor lock circuit?

The lock circuit is energized, allowing the encoder motor to rotate. The motor lock circuit has no voltage provided to it, applying the lock. The circuit is open, allowing the transfer of torque to the front axle. The circuit flashes repeatedly to warn the driver.

The 4LO setting on the NV-246 transfer case is used when driving off-road in deep mud or climbing steep hills because it delivers extra torque by:

Disengaging the rear output shaft completely. Applying the clutch brake. Lowering the applied gear ratio. Automatically engaging the front axle motor lock.

The 2HI setting on the NV-246 transfer case is used for normal driving with power sent only to the rear wheels. This setting also provides what specific operational advantage?

Maximum torque delivery. The best fuel economy. The ability to shift-on-the-fly. Automatic engagement of four-wheel drive.

If the indicator light on the NV-246 selector switch flashes the selected gear repeatedly for 30 seconds and then returns to the last chosen setting, what condition does this indicate?

The shift is complete and the system is operating normally. The transfer case has shifted successfully into Neutral. The transfer case cannot make a requested shift. The ATCM has successfully accessed VIN information.

What is the role of the Transfer Case Encoder Assembly?

It mechanically rotates the sector shaft to shift the transfer case. It applies pressure to the clutch pack when required. It converts the current sector shaft position (mode or range) into electrical signal inputs to the transfer case shift control module. It provides the pulse width modulated signal to the motor.

What are the two primary components that the Automatic Transfer Case Control Module (ATCM) controls on an electronic 4WD system?

The speed sensors and the 4WD indicator. The transfer case switch assembly and the 4WD clutch. The transfer case encoder motor assembly and the front axle motor assembly (to engage/disengage the front axle). The PCM and the VIN information.

Which electronic system provides the necessary calibration data (based on axle ratio, transmission, tire size, and engine) to the ATCM via the on-vehicle network?

The Driver Information Centre (DIC) The Vehicle Speed Sensor (VSS) The Powertrain Control Module (PCM) The front output shaft speed sensor

When the transfer case shift control module detects a fault in the electronic system, what is likely to occur?

The ATCM is permanently locked out of 4HI. A service 4WD lamp or warning message appears, and a Diagnostic Trouble Code (DTC) is likely set. The motor lock remains energized continuously. The clutch assembly capacity is automatically reduced to 400 ft/lb.

The Front Output Shaft Speed Sensor is used by the ATCM in Auto 4WD mode to monitor the difference between front and rear speeds and to determine what two critical operational metrics?

The pinion gear depth and backlash. The VSS reference speed and the gear reduction ratio. The amount of slip and the percent of torque to apply to the front axle. The maximum rotation speed of the encoder motor.

When a transfer case fails, what component is listed in the sources as a mandatory related sales opportunity?

Locking hubs U-joints Seals Wheel studs

When a customer is buying replacement parts for a transfer case assembly, what information is necessary for proper component identification?

The last four digits of the VIN. The stamping number or tag number found in the parts catalogue. The name of the clutch pack manufacturer. The required maximum operating temperature.

If a clutch pack (viscous coupling) fails in an AWD system, which component is listed as a related sales item?

Differential lube Axle retaining nut U-joints Front axle motor

What is the operational distinction between the two types of speed sensors on the rear output shaft?

One is a high-speed sensor, and the other is a low-speed sensor. One is digital, and the other is analog. One is the Vehicle Speed Sensor (VSS) used as the reference speed, and the other is the rear output shaft speed sensor for ATCM calculations. One reads speed in km/h, and the other reads speed in rpm.

The terms driveshaft and propeller shaft are often used interchangeably in the context of four-wheel and all-wheel drive systems. What other pair of terms are explicitly noted as interchangeable in the sources?

Transfer case and Transaxle Differential and Viscous Coupling All-wheel drive and Four-wheel drive Encoder Motor and Solenoid