Welcome to the JeepSpecs.com in-depth technology glossary on WK Generation Jeep Grand Cherokee. We have organized as much information as we could find into a helpful article below. Is something incorrect or missing? Please get in touch with us and we’ll fix it!
4.7-liter V-8 gen II (2008-2009 models)
The new 4.7-liter V-8 offers better fuel economy, power and torque than the previous 4.7-liter engine, while at the same time delivering improvements in refinement. The new 4.7-liter V-8 incorporates two spark plugs per cylinder (the only Chrysler Group engine to do so, other than the 5.7-liter HEMI), increased compression ratio, improved cylinder-head port flow and a new combustion system. The new engine also is capable of operating on E85 ethanol fuel.
5.7-liter HEMI® V-8 gen II (2009-2010 models)
The all-new 5.7-liter HEMI® V-8 engine offers better fuel economy, improved idle quality and overall refinement, along with more horsepower and torque. In addition to Variable Valve Timing (VVT) and expanded Multi-displacement System (MDS) operating range, the HEMI’s fuel economy and performance improvements result from increased compression ratio, an active intake manifold with long runners for low-end torque and short runners for high-rpm power, improved cylinder-head port flow efficiency, and reduced restriction exhaust and induction systems. Numerous other hardware upgrades were implemented to build on the quality, reliability and durability reputation of the HEMI® engine. These include crankshaft structural upgrades, a dual-mass crankshaft damper, floating pin piston design, valve spring design and oil pump capacity increase for VVT.
A spoiler below the front bumper that reduces aerodynamic lift, turbulence and drag by diverting airflow around, rather than under, the vehicle. It may also be used to improve airflow through the radiator and/or air conditioning condenser.
Helps reduce lean by resisting any unequal vertical motion between wheels on the same axle.
The relationship between driveshaft revolutions and axle revolutions. Usually expressed as 3 .0:1 (read “three point zero to one”) meaning 3 .0 driveshaft revolutions to each revolution of the axle. The figure is obtained by dividing the number of teeth on the ring gear by the number of teeth on the pinion gear in the differential. A low numerical axle ratio (example: 3 .07:1) is known as a “fast/high” ratio, because road speed is relatively fast for any given engine speed. The characteristics of this ratio are lower engine speed, reduction in performance ability (power), and fewer engine revolutions per mile, thus improving fuel economy. A high numerical axle ratio (example: 4.10:1) is known as a “slow/ low” ratio, because the road speed is slower relative to engine speed. The effects include raised engine speed, increased performance ability (power), increased engine revolutions per mile and increased fuel consumption.
Enhanced seat-belt reminder system. If a vehicle is driven without the driver or front passenger being properly belted, the system will periodically activate a chime and illuminate a lamp in the instrument cluster to remind the driver to buckle up. The lamp will stay lit in the instrument panel until the driver or passenger bucklesup. The driver should then instruct all occupants to buckle up as well.
A type of vehicle construction in which the body structure is attached to a separate frame.
Brake Assist System
Tests have shown that most drivers fail to apply the brake pedal vigorously enough during an emergency situation, and the Brake Assist System was designed to intervene if the driver reacts quickly but hesitantly when braking. The system recognizes situations in which emergency braking is called for and automatically increases braking pressure to its maximum. The system computer compares such factors as pedal travel, speed of pedal travel and road speed with other stored values to determine if an emergency situation exists.
The degree of slope which defines the largest ramp or hill that a vehicle can travel over without scraping against the frame or underbody components.
An integral part of the disc brake assembly that holds the brake pad. When the brakes are applied, the caliper’s pistons push the brake pad against the rotor, slowing or stopping the vehicle.
An emissions-control device in the exhaust system that contains platinum or palladium as a catalyst for the chemical reaction of unburned hydrocarbons and carbon monoxide. It converts them into water vapor, carbon dioxide and other harmless gases.
Child Seat Anchor System
All Chrysler vehicles feature lower anchors and upper tether anchors for compatible child seats. An upper tether with a metal clip,
Coil-on-Plug Ignition System
Includes individual coils connected directly to each spark plug. The coils provide more energy under normal operating conditions, eliminating the weak link in previous ignition systems — ignition cables. Since polarity is constant, these results reduce electrode erosion and extend spark plug life.
Common-Rail Diesel (CRD)
A diesel engine with a fuel injection system employing a common pressure accumulator, called the rail, which is mounted along the engine. The rail is fed by a high-pressure fuel pump. In the common-rail injection system, the injection pressure is independent from engine speed and load. Therefore, the injection parameters can be freely controlled. Usually a pilot injection is introduced, which allows for reductions in engine noise and emissions. This advanced system also contributes to increased power and torque.
The volume of the combustion chamber and cylinder when the piston is at the bottom of its stroke, divided by the volume of the combustion chamber when the piston is at the top of its stroke. The higher the ratio, the more energy that is developed from the air/fuel mixture.
Controller Area Network (CAN)
Electrical architecture system that maintains open communication designed to link in-vehicle systems. CAN is the in-vehicle network for the engine management, the body electronics such as door and roof control, air conditioning, lighting, and entertainment control. It simplifies the coordination of several electronic functions.
Cubic Inch Displacement (CID)
A measurement of engine size. In this case, displacement is equal to the total number of cubic inches the pistons displace as they move from bottom dead center to top dead center within the engine. Displacement can also be measured in liters (L).
Curb Weight (CW)
The weight of an empty vehicle without cargo or occupants, including fuel, coolant, oil and all standard and optional equipment.
A footrest found to the left of the leftmost pedal. It provides a place for the driver to brace his/her left leg during hard cornering
The degree of slope a vehicle can depart from without scraping the ground or damaging any rear-end components.
Often referred to as “run-on” in a gasoline engine, it occurs when the ignition is turned off but the engine continues to run. It’s caused by excessive amounts of fuel in the cylinders, coupled with hot glowing carbon deposits in the combustion chamber that act as glow plugs; the combination produces a quasi-diesel engine. It can also be caused by high manifold pressures (on a normally aspirated engine) combined with excessively retarded ignition timing.
A system of gears located in the center axle housing between the driving wheels. Its purpose is to transmit engine torque to both driving wheels, whether the vehicle is traveling straight or turning a corner. This gearing allows each wheel to rotate at different speeds (as required when turning a corner), but maintains equal torque on each wheel to achieve the desired forward or rearward movement. Fourwheel- drive vehicles have a differential at both front and rear axles.
Hydraulically actuated calipers force pads against the sides of a rotor to create friction, leading to vehicle braking. This action is similar to the way you would stop a spinning bicycle tire with your thumb and forefinger. Some vehicles have front disc/rear drum arrangements, although most models are now equipped with four-wheel disc brakes. This system is generally regarded as superior to disc/drum brake applications due to its resistance to fade or reduction of braking ability during repeated applications, such as coming down a steep grade. The pads and rotor are better exposed to air cooling then an enclosed drum brake design.
The total volume of an engine’s cylinders that is “swept out” by the pistons. Displacement is usually measured in cubic inches, cubic centimeters or liters. One liter or 1,000 cubic.
Drag Coefficient (Cd)
One measure of a vehicle’s efficiency as an aerodynamic shape. Drag coefficient is a mathematical factor which, when multiplied by the projected square footage area of the vehicle, gives its drag force in pounds. The lower the number, the greater the aerodynamic efficiency. Drag Coefficient (Cd) = (Drag Force ÷ Dynamic Pressure) x Frontal Area.
The general qualitative evaluation of a powertrain’s operating qualities, including idle smoothness, cold and hot starting, throttle response, power delivery and tolerance for altitude changes.
Shaft connecting the transmission output shaft to the differential drive pinion shaft. Four-wheel-drive vehicles add a second driveshaft from the transfer case to the front differential. Also known as a propeller shaft.
Vehicle components that drive the vehicle and transfer power. Includes the engine, clutch, torque converter, transmission, transfer case, universal joints, driveshafts, differential gears and axle shafts. (Note: The clutch and torque converter are part of the transmission).
Eco Indicator lets drivers of 5.7-liter HEMI®-powered vehicles know when they are in four-cylinder mode, allowing them to modify their driving habits for improved fuel efficiency. For 2010, this feature has been expanded to include additional powertrain systems, helping customers save fuel by avoiding rapid starts, maintaining steady speeds and decelerating smoothly. The feature is included as part of the Electronic Vehicle Information Center (EVIC).
Electronic Fuel Injection (EFI)
A system which introduces fuel at each cylinder’s intake port through individual injectors in place of a central conventional carburetor. EFI precisely controls the amounts of fuel used and improves the dispersion of fuel in the air charge.
Electronic Limited-Slip Differential (ELSD)
An ELSD in the front and rear axles is only available with theQuadra-Drive II® active fourwheel- drive system (with the NV245 transfer case). In an ELSD, each axle includes an electronically controlled wet clutch pack differential. This system is made up of a hydraulic pump, piston and electronically controlled solenoid valve that controls pressure. The hydraulic pump uses the axle fluid as its hydraulic fluid. The pump case is splined to the differential carrier, and the pump rotor is splined to an axle shaft. In this way, axle shaft speed difference is needed to turn the pump and build pressure. Pressure is controlled by the solenoid valve and is applied to the piston as needed. The piston acts on the wet clutch to create torque and eliminate slip. The Final Drive Control Module activates the clutch packs to deliver torque to the wheel with the most traction. When the antilock brake system is activated, the Final Drive Control Module stops sending current to the differential solenoid, and the pressure will bleed off inside the clutch pack, unlocking the clutch. ELSDs can rapidly transfer torque to the wheel with the most traction, producing twice as much torque in the rear axle and four times as much in the front axle, compared to Vari-Lok® progressive axles.
Electronic Range Select (ERS)
Electronic Range Select (ERS) driver-interactive shift control is standard with either the 545RFE, WA580 or W5J400 transmissions. Moving the shifter left and right when the shifter is in the Drive position allows the selection of the desired top gear. ERS enables the driver to select the top gear, providing more control.
Electronic Roll Mitigation (ERM)
ERM is an added vehiclestability measure of Electronic Stability Program* (ESP), on select models, designed to help maintain vehicle stability during an emergency maneuver or accidentavoidance situation. While ESP aids the driver in maintaining vehicle stability, within the limits of traction, to keep the vehicle on course, Electronic Roll Mitigation (ERM) attempts to determine when a vehicle is in a position to roll, then applies a front brake to reduce the likelihood of such an occurrence. ERM will not aid vehicle stability in “trip” situations, such as when the vehicle strikes a curb or another object.
Electronic Stability Program (ESP)
This system aids the driver in maintaining vehicle directional stability. ESP will do whatever can be done, within the limits of available traction, to keep a vehicle on course. ESP takes the capabilities of ABS and all-speed traction control to a new level of vehicle stability. The system’s sensors detect oversteer or “fishtailing,” which occurs when the rear wheels of a vehicle swing too wide during a turn, causing a vehicle to go off the driver’s intended path. The system’s sensors detect understeer too — also known as “plowing.” It occurs when a vehicle is responding too slowly to steering changes in a turn, causing the front end to slide out. ESP uses electronic sensors to determine if there is a difference between the vehicle’s actual path and the driver’s intended path. The steering wheel sensor monitors the driver’s intent. To measure the vehicle’s actual path, ESP uses wheelspeed sensors, a lateral acceleration sensor and a yaw sensor. With this data, ESP selectively applies brakes and reduces engine power even before the driver senses there is a problem.
Electronic Throttle Control (ETC)
A much more sophisticated system than traditional injection control, ETC responds through mechanical analog devices to determine the amount of fuel to inject as well as injection timing, enhancing responsiveness and reducing emissions. It uses a DC motor with reduction gears to open and close the throttle, controlling all airflow into the engine. There is no physical connection between the pedal and the throttle. The engine control computer interprets accelerator pedal movements and translates them into throttle positions.
Electronic Vehicle Information Center (EVIC)
Programmable module with a reconfigurable display that shows all trip information screens and can include such features as: compass/outside temperature, average and current fuel economy, estimated distance to empty, elapsed trip time, miles to next service, or a blank screen. It also has a secondary trip odometer and displays warning screens, vehicle personalization screens and a personalized menu. In many vehicles, the EVIC also displays Tire Pressure Monitoring System warnings.
Engine Block Heater
An electrical heating element, powered by an external 110- volt supply, immersed in the coolant in the engine block, or directly into the engine block, to facilitate easier winter starting at low ambient temperatures.
A way of slowing the vehicle when going down a grade by shifting to a lower gear andusing the compression resistance of the engine to help slow the vehicle.
Enhanced Accident Response System
In the event of an impact that causes air bag deployment, an Enhanced Accident Response System switches on the interior lamps and unlocks the door after the vehicle has stopped. This helps emergency personnel render appropriate assistance. The lamps remain on as long as the battery has power or until the ignition key is removed.
Final Drive Ratio
The ratio between the engine rpm and the drive-wheel axle shaft rpm. It is determined by the ring-and-pinion gear inside the differential. For example, if the ratio is 4.00:1, the driveshaft rotates four times for each rotation of the rearaxle differential gear, the axle shafts and the wheels. A vehicle’s acceleration and fuel economy can be altered by the final drive ratio.
Flex Fuel Vehicle (FFV)
A vehicle that is designed to operate on unleaded gasoline or a blend of unleaded gasoline and ethanol (alcohol), up to a maximum of 85 percent ethanol (E85). E85 offers performance and environmental benefits. When ethanol is blended into E85 (85 percent ethanol with 15 percent gasoline), the result is a 100+ octane rating with an approximate 5 to 7 percent increase in engine horsepower in some vehicles. E85 contains fewer toxins than are found in unleaded gasoline and provides an estimated 35 percent reduction in the exhaust emissions. However, E85 is about 30 percent less efficient than gasoline. As a result, more ethanol than fuel is required to travel an equivalent distance.
A drivetrain that uses a transfer case to distribute engine power between the front and rear axles in order to drive all four wheels. Full-time four-wheel-drive systems utilize a center differential, which enables the front and rear driveshafts to turn at different speeds, thereby allowingengagement on dry pavement for normal driving conditions. A part-time system does not employ a center differential and, during normal driving conditions, must operate only in two-wheel drive. With a parttime system, the four-wheeldrive mode is to be used only when off-road or on wet or slippery surfaces.
A type of fuel system using a pump and injectors, instead of a carburetor, to meter fuel. There are two main types of fuel injection: direct cylinder injection, which sprays the fuel right into the combustion chamber, and multipoint injection, which puts the fuel charge into the intake passage somewhere upstream of the intake valve. Fuel delivery can be controlled mechanically or electronically, and fuel pressure can be either pulsed, continuous or a combination of the two. Pulsed injection precisely controls the length of time the fuel is sprayed, whereas continuous injection makes no attempt at timed injections, but rather regulates the quantity of steady flow.
Fuel Saver Mode Display
Lets drivers of HEMI-powered vehicles know when they are in fourcylinder mode, allowing them to modify their driving habits for improved fuel efficiency. Included as part of the Electronic Vehicle Information Center.
The number of revolutions of a driving gear required to turn a driven gear through one complete revolution. For a pair of gears, the ratio is found by dividing the number of teeth on the driven gear by the number of teeth on the driving gear. A gear with 45 teeth driven by a gear with 15 teeth would provide a ratio of 3.0:1 (read “three point zero to one”). A gear with 15 teeth driven by a gear with 45 teeth would provide a ratio of 1.0:3.
Gross Vehicle Weight (GVW)
The total weight of a vehicle with cargo (including camper body), driver, passengers, fuel, fluids and standard and optional equipment.
Headlamps with halogen gas-filled bulbs that produce more lighting power per watt of electricity than conventional bulbs.
Heater, Ventilation and Air Conditioning (HVAC) System
The climate control system of a vehicle. The HVAC is designed to provide a comfortable climate for all passengers and good visibility through the windows and windshield, thereby reducing driver stress and fatigue.
The 5.7L HEMI V8 engine includes the following features: Aluminum cylinder heads with hemispherical combustion chambers and pushrod-operated, splayed valves for high airflow. A high compression ratio for power and economy. Electronic throttle control system. Integrated Air-Fuel Module incorporating the intake manifold and 14 other components. Two spark plugs per cylinder fired by a distributorless ignition system with high-power coils to ensure consistent, complete combustion. A fully balanced, cast, nodular iron crankshaft running in cross-bolted main bearing caps to reduce deflection and vibration. SRT8 models also receive a HEMI engine. Increased to 6.1L, this high-performance variant incorporates many additional race-proven enhancements.
High Intensity Discharge (HID)
High Intensity Discharge (HID) low-beam headlamps provide approximately 21/2 times the light output of conventional reflector lamps for even better nighttime illumination. Their light appears bluish compared to conventional lamps, but their spectrum is closer to that of sunlight than halogen or incandescent bulbs to further improve nighttime visibility and have a significantly longer lifetime than halogen bulbs.
Hill Descent Control
Allows a smooth and controlled hill descent on rough or slippery terrain without the driver needing to touch the brake pedal. This system applies the brakes to each wheel individually when needed to reduce forward motion while negotiating down steep grades.
Hill Start Assist
Assists the driver when starting a vehicle from a stop on a hill by maintaining the same level of brake pressure the driver applied for a short period of time after the foot has been removed from the brake pedal. The system will release the brake pedal in proportion to the amount of throttle applied. If the throttle is not applied within a short period of time after the foot has been removed from the brake pedal, Hill Start Assist will release brake pressure.
A measure of the amount of work that can be done in a certain amount of time. One horsepower is equal to 550 lb-ft of work per second, or the energy needed to lift 550 lb one foot off the ground in one second. The horsepower of an engine depends upon the torque and speed of the engine. hp = (Torque x rpm) ÷ 5,252.
A suspension design that allows the connected or adjacent wheel to move independently. An independent suspension design is simply a design in which a wheel is not directly connected to another wheel on the vehicle. Allowing a wheel to move up and down independently over a bump means only that wheel reacts — providing a smoother, more stable ride.
Allows an iPod to be plugged into the vehicle’s sound system to play music through the vehicle’s speakers, charge/recharge the iPod when the ignition is on, display artists and music choices on the radio and pause play when the UConnect system receives a phone call. The iPod can be controlled through the radio controls and the remote steering wheel switches (if equipped). The system uses a Universal Customer Interface (UCI) connector located in the glove box. An optional connection cable is available through Mopar.
Jeep® Truck Engine Controller (JTEC)
The latest version of the Powertrain Control Module (PCM) used in Jeep and Dodge truck models. JTEC precisely controls the fuel injector pulses and ignition spark timing for peak engine power and efficiency under all operating conditions: starting, idling, acceleration, cruising and deceleration.
A portion of the lower instrument panel that is designed to absorb energy in the event of a frontal collision, maximizing the air bag’s effectiveness and minimizing the chances of occupants sliding under the dashboard. A driver inflatable knee blocker acts like an air bag for the driver’s knees and inflates when the driver air bag is deployed.
A device in the differential that limits the speed difference between the two wheels. This prevents one wheel from spinning while the other is stationary and improves traction on slippery surfaces.
A device in the differential that eliminates the speed differences between the two driveshafts or axle shafts. This ensures that each axle or wheel will receive equal torque.
Lower Anchors and Tethers for Children (LATCH)
The LATCH system helps simplify the installation of a compatible aftermarket child seat without using the vehicle’s seat belts. This system takes advantage of both the upper and lower tether anchors to minimize the movement of compatible child seats while maximizing proper installation by the users.
Low-Risk Deployment Air Bags
These front-passenger air bags use unique shape, venting, folding patterns, advanced inflators or a combination of these four technologies to position and inflate the restraint properly for a belted passenger while also meeting federal safety requirements for out-of-position, small occupants and rear-facing infant seats. Even with these advanced front-passenger air bags, all occupants are advised to always sit properly in their seats with the seat belt fastened. Children 12 and younger should always be seated in a back seat correctly, using an infant- or child-restraint system or having the seat belt positioned correctly for their age and weight.
Manufacturer’s Suggested Retail Price (MSRP))
The suggested full retail price of a product as determined by the product’s manufacturer.
Multi-Displacement System (MDS)
Deactivates four cylinders when the remaining four are enough to meet power requirements. The engine operates on all eight cylinders for acceleration and heavy loads and four cylinders in city traffic driving and for cruising, even at some interstate highway speeds. The engine idles on eight cylinders for maximum smoothness. MDS operates between 1,000 and 3,000 rpm. It will operate in four-cylinder mode when the torque requirement is less than 95 percent of the maximum available from four cylinders. It provides full-rated power in V8 form with an increased fuel economy benefit when operating in fourcylinder mode, depending on driving habits and vehicle usage. It is integrated into the basic engine architecture and is more reliable than add-on systems. Deactivation and activation of the cylinder is transparent to the driver.
Multipoint Fuel Injection (MPI)
Fuel injectors are mounted directly in the intake manifold close to the intake ports of each cylinder. Improves fuel distribution and engine breathing for improved efficiency and reduced exhaust emissions.
MyGIG™ Entertainment System
The MyGIG Entertainment System is a cutting-edge multimedia audio and entertainment system. The 20-gigabyte hard drive is available for music storage and management. SIRIUS Satellite Radio and UConnect Hands-free Communication are optional on this system.
MyGIG™ Multimedia Infotainment System
This multimedia infotainment system is a sound/navigation/ media system driven by a 20 Gigabyte hard disk drive (HDD). The HDD responds to both voice commands and touch-screen input to enable the user to manage files and operate the system’s functions. A 6.5-inch screen displays navigation functions and allows the user to view files, such as photos or DVDs, and use the system’s touch commands. The functions of the MyGIG system fall into three categories: Information, (e.g., turn-by-turn navigation and traffic alerts), Entertainment (e.g., CDs, DVDs, SIRIUS®, MP3 files), and Communications (e.g., hands-free calling and voice recorder for memos). To view a DVD on the head unit’s screen in the front seat, the vehicle must first be placed in Park. The MyGIG voice command function recognizes and “learns” phrases in English, French, or Spanish for U.S. and Canada applications. Integrated Bluetooth® connectivity and the button to select hands-free calling are now located on the MyGIG. To use hands-free calling the user must have a Bluetooth enabled cell phone. While the MyGIG system has a multitude of capabilities, its available functions will be determined by the vehicle’s equipment. For example, the MyGIG system has the capability of displaying the image from a rear park assist camera on its screen; however, the vehicle must have the necessary equipment (e.g., rear-mounted camera) for the function to operate.
Noise, Vibration and Harshness (NVH)
An industry term associated with vibration and audible sounds. Harshness usually refers to transient frequencies or shock. The human ear can generally detect frequencies in the range of 20 to 20,000 Hz (Hertz, or cycles per second). Vibrations above and below this range may not be detected by the human ear, but may still require treatments for improved product per formance, longevity and customer satisfaction.
It can be either an “extra” gear (usually fifth in a manual gearbox) or an aftermarket unit that bolts on between the gearbox and the driveshaft. The purpose of overdrive is to reduce engine rpm at highway speeds to obtain an increase in fuel economy, to reduce engine wear and to lower transmission temperatures. In overdrive, the engine turns less than one revolution for each revolution of the driveshaft. For example: 0.75:1, in which the driveshaft rotates once for every 3/4 revolution of the engine.
ParkSense® Rear Park Assist System
This system supplements the inside and outside rearview mirrors, helping the driver determine if an obstacle is in the rear path of the vehicle when maneuvering in tight spaces at parking speeds. When the driver selects Reverse or Neutral, the system scans for objects behind the vehicle, using four ultrasonic sensors located in the rear fascia. Objects as close as 10 inches and as far away as 59 inches can be detected. A warning display above the rear window provides both visible and audible warnings indicating the proximity of most larger, stationary objects that might be outside the driver’s line of sight.
ParkView™ Rear Back-up Camera
ParkView Rear Back-up Camera displays a rearview video image when the vehicle is in Reverse. This feature helps the driver determine if an obstacle is in the path of the vehicle and supplies better rearward visibility when backing up. The ParkView Rear Back-up Camera, positioned at the rear of the vehicle, allows drivers to see things directly behind the vehicle and low to the ground, an area that is normally a blind spot. A color image displays on a screen in front of the driver whenever the transmission is placed in Reverse. Shifting out of Reverse deactivates the system. The camera operates in all types of lighting situations and needs no supplemental light. The rear back-up camera benefits the driver by helping them see objects behind the vehicle as they maneuver in Reverse.
Power Adjustable Pedals
The horizontal position of the brake and accelerator pedals (and clutch pedal on Ram models) can be adjusted by the driver. The pedals can be positioned in a way that allows the driver to sit a comfortable distance from the driver’s air bag and still have complete accessibility to the pedals.
Powertrain Control Module (PCM)
Precisely controls fuel injector pulses and ignition spark timing for peak engine power and efficiency by using electronic sensor inputs from the engine, transmission and exhaust system.
Quadra-Drive II Active Four-Wheel Drive
The NV245 electronically shifted active, two-speed transfer case operates in conjunction with Electronic Limited-Slip Differentials (ELSD) to actively shift torque in all directions to maintain maximum traction.
Quadra-Trac I Four-Wheel Drive
The NV140 full-time, single-speed transfer case operates in conjunction with all-wheel traction control to respond to loss of traction via open differentials.
Quadra-Trac II Active Four-Wheel Drive
The NV245 electronically shifted active, two-speed transfer case operates in conjunction with 4-Wheel Brake Traction Control (4BTC) to respond to wheel slippage.
This driver convenience feature automatically senses moisture on the windshield and activates the wipers.
The maximum recommended revolutions per minute for an engine. In vehicles equipped with a tachometer, redline is usually indicated by a red area on the gauge.
Starts the vehicle’s engine from up to 300 feet away. If the vehicle is equipped with Automatic Climate Control, it will automatically adjust, providing defrost, heat or air conditioning based on the outside temperature. Control of the Remote Start system is integrated into the vehicle’s remote keyless entry fob.
Mounts in the cargo area and snaps out of the bezel when necessary. It is dual-purpose, functioning as a dome light and as a removable flashlight. Rotor
A flat disc that rotates with and is attached to a wheel in a disc brake system. During braking, pads are pressed against the rotor by the calipers to slow the vehicle.
Also known as “Zero-Pressure” tires, run-flat tires allow the vehicle to travel up to 50 miles at 55 mph with no tire pressure. Run-flat tires typically feature a stiffer internal construction that is capable of temporarily carrying the weight of the vehicle, even after the tire has lost all air pressure. The tire construction typically consists of rubber sandwiched between layers of heatresistant cord in the sidewall to help prevent the tire sidewalls from folding over on themselves. Because run-flat tires are so good at masking the symptoms of air loss, they require a tire pressure monitoring system to alert the driver to the loss of pressure.
Running Ground Clearance
The distance from the ground to the lowest point between the axles in a vehicle. It can be measured while the vehicle is loaded or at curb weight.
Sentry Key® Antitheft Engine Immobilizer
This system includes the Sentry Key Immobilizer Module (SKIM) and two keys equipped with a transponder (electronic device) located inside the key head. If the SKIM recognizes the signal from the key as valid when the ignition switch is turned on, it will allow the engine to run. If the signal is recognized as invalid, the engine will start, run for approximately two seconds, and then stall. After six consecutive unsuccessful engine start attempts, the engine controller will disable the engine starter and fuel system. Additional encoded keys can be obtained through Chrysler, Dodge or Jeep® dealerships.
Sequential Multipoint Fuel Injection (SMPI)
A fuel injection system that uses one fuel injector per cylinder and injects fuel into the intake ports individually in a predetermined sequence so fuel is delivered at the exact time it is needed.
A full-time, active on-demand system that anticipates and prevents wheel slip before it occurs. This premium system offers a “4WD Auto” mode that is ideal for full-time driving. When driving in 4WD Auto mode, the system uses vehicle sensors to adjust and redirect torque between front and rear axles based on real-time driving conditions, providing the vehicle with responsive traction performance. For added capability when traversing steep grades, rough terrain or extremely poor-traction surfaces, the transfer case includes a “4WD Low” mode. This second gear multiplies engine torque 2.72 times and locks the clutch pack for maximum traction.
A drive belt that combines a Vribbed and flat-back belt and is designed to reduce the number of belts needed to drive the accessories. An automatic tensioning device is usually required.
SIRIUS Backseat TV™
Chrysler Group is the first and only auto manufacturer to offer SIRIUS Backseat TV in its 2008 model year vehicle lineup. Backseat TV features three channels of respected children’s TV featuring many of the most well-known kids’ programming, including Nickelodeon, Disney Channel and Cartoon Network. The system operates via an in-vehicle satellite video receiver and two small roof-mounted antennas. Programming is displayed on the vehicle’s second- and/or third-row video screen, and channel name, program title and rating will be broadcast and displayed on the screen. For added flexibility, rear-seat passengers can enjoy SIRIUS Backseat TV while frontseat occupants listen to SIRIUS Satellite Radio. The system can be operated from either the rear-seat entertainment unit or the radio head unit. In addition, when the vehicle is in Park, programming can be displayed on the MyGIG screen for front-seat viewing.
A sturdy steel plate mounted beneath the front suspension, transfer case or fuel tank of a vehicle to protect these components from obstacles likely to be encountered in rugged country (rocks, tree stumps, etc.).
SmartBeamTM Intelligent Headlamp High-Beam Control System
This intelligent system automatically provides the maximum amount of light for nighttime driving conditions. Under normal “manual” high-beam operation, both the low and high beams are on at full intensity. When the SmartBeam feature is working, the low beams remain on at full intensity, while the intensity of the high beams varies from 25 to 100 percent to provide the maximum amount of light for nighttime driving conditions. A camera on the windshield measures the refraction of light and density.
Speed-Sensitive Power Steering
A steering system that adjusts the amount of power steering assist according to vehicle or engine speed. At high speeds, assist is at a minimum, providing crisp road feel. At low speeds such as parking, assist is greater, so turning the steering wheel requires considerably less effort.
Also (incorrectly) referred to as an antisway bar. It is a transverse bar linking both sides (either front or rear) of the suspension, generally taking the form of a torsion bar, with rubber bushing mounts on the chassis that allow it to turn freely. The bar’s main function is to reduce body lean, but it has an influence on overall handling characteristics as well.
Stain-repel seat fabric
Offers three key benefits: repelling stains, controlling odor and reducing static electricity. Dual-action technology repels and releases spills that would stain other auto fabrics. This technology also allows the upholstery surface to dry quickly. In addition, the seating fabric reduces static electricity generated when entering or exiting the vehicle.
With the introduction of Control Area Network BUS (CAN Bus), vehicle functions can be operated “be wire” or without any mechanical assistance. In many Chrysler Group vehicles, starting the vehicle is one of the operations that is now computer controlled. The vehicle’s Electronic Control Unit (ECU) accepts an input from the key turning in the ignition to the “Start” position; a number of functions are set into motion that will start the engine without the operator holding the key in the “Start” position. This is just one of the functions that benefit from CANBus technology.
Trailer Sway Control
Reduces trailer sway and improves handling in adverse towing conditions caused by crosswinds, traffic and improper weight distribution on the trailer. The system monitors the vehicle’s movement relative to the driver’s intended path, and the vehicle yaw sensor recognizes sway. TSC applies brake pressure to one front wheel to counteract the yaw induced by the trailer and applies brake pressure to all four wheels to slow the vehicle. As the trailer sways to the other side of the vehicle, TSC will increase pressure to the opposite side of the vehicle. The system will continue to apply alternating brake pressure and reduce engine torque until the trailer is under control.
Uconnect Multimedia includes:
Media Center radios–five different radio options, three with a 30-gigabyte hard drive, USB input for music and photo downloads. The Media Center is the hub of the vehicle infotainment system
Audio systems–Sound systems including speakers and amplifiers
Audio Jack–Standard input allows MP3 players or other audio sources to be played through the vehicle’s audio system
Bluetooth Music Connection–Debuting on the all-new 2011 Jeep Grand Cherokee, allows streaming music from supported cell phones (and future MP3 players) to be played over the car’s sound system
iPod® Control–Full iPod integration with controls available through the media center or steering wheel
iPod USB Control–Debuting on the 2011 Jeep Grand Cherokee, allows voice search by song title and artist for iPod devices
SIRIUS Satellite Radio–More than 130 channels of the best music, entertainment and information. Depending upon model availability, SIRIUS Satellite Radio may be operated from the rear-seat entertainment unit or from the Media Center
Voice Command–Chrysler Group LLC’s hands-free voice recognition system. Most Media Center radio features are operable with Voice Command, which is standard with Uconnect Phone
Rear-seat entertainment–DVD player and a 9-inch video screen with wireless headphones, inputs for gaming devices, etc.
Dual-screen rear-seat entertainment–DVD player with two 9-inch video screens (one for each row) with wireless headphones, inputs for gaming devices, etc.
SIRIUS Backseat TV™–Streaming TV from Nickelodeon™, Disney Channel™ and Cartoon Network Mobile™ (available with rear-seat entertainment system)
Uconnect Navigation combines the features of Global Positioning System (GPS), points of interest, SIRIUS Traffic and Voice Command. Chrysler Group LLC’s Voice Command and touch screen allow easy operation. If the vehicle is in motion, Voice Command will recognize more than 100,000 words for inputting addresses. New for 2010, the integration of Garmin’s well-known navigation technology into one of Chrysler’s media center/head-unit options. This offers customers reliable, seamless use of what has become a necessary technology.
Uses Bluetooth technology and Chrysler Group LLC’s Voice Command to provide voice-controlled wireless communication between the occupants’ compatible mobile phones and the vehicle’s onboard receiver. The built-in Address Sync feature automatically downloads as many as 1,000 phone book entries from supported phones, which can then be selected by voice command. The system also recognizes three languages and is capable of learning words. Voice Command maybe used to manage onboard phone-book entries, select radio stations and access voice mail. Voice memos may be recorded using microphones that are integrated within the rearview mirror. Multiple memos of up to 30 seconds each may be stored in the system. The hands-free option promotes safety, freedom, value and flexibility. With hands-free phone operation via Bluetooth®, Voice Command enables users to select radio stations, choose satellite radio channels and enter navigation destinations by voice recognition.
The system provides high-speed data transfer and flexibility, combining WiFi and 3G cellular connectivity for a new level of wireless technology. The system transforms the vehicle into a “hot spot” to deliver the Internet directly to the vehicle for instant access to Web sites, e-mail, personalized music, online gaming, photo albums and more. The Good Housekeeping Research Institute gave Uconnect Web a 2009 VIP (Very Innovative Product) Award. .