Jeep Cherokee (KL): Electronic Stability Control (ESC)
This system enhances directional control and stability of the vehicle under various driving conditions. ESC corrects for oversteering or understeering of the vehicle by applying the brake of the appropriate wheel(s) to assist in counteracting the oversteer or understeer condition. Engine power may also be reduced to help the vehicle maintain the desired path.
ESC uses sensors in the vehicle to determine the vehicle path intended by the driver and compares it to the actual path of the vehicle. When the actual path does not match the intended path, ESC applies the brake of the appropriate wheel to assist in counteracting the oversteer or understeer condition.
- Oversteer - when the vehicle is turning more than appropriate for the steering wheel position.
- Understeer - when the vehicle is turning less than appropriate for the steering wheel position.
The "ESC Activation/Malfunction Indicator Light" located in the instrument cluster will start to flash as soon as the ESC system becomes active. The "ESC Activation/ Malfunction Indicator Light" also flashes when the TCS is active. If the "ESC Activation/Malfunction Indicator Light" begins to flash during acceleration, ease up on the accelerator and apply as little throttle as possible. Be sure to adapt your speed and driving to the prevailing road conditions.
WARNING!
- Electronic Stability Control (ESC) cannot prevent
the natural laws of physics from acting on the
vehicle, nor can it increase the traction afforded by
prevailing road conditions. ESC cannot prevent
accidents, including those resulting from excessive
speed in turns, driving on very slippery surfaces, or hydroplaning. ESC also
cannot prevent accidents
resulting from loss of vehicle control due to inappropriate
driver input for the conditions. Only a
safe, attentive, and skillful driver can prevent accidents.
The capabilities of an ESC equipped vehicle must never be exploited in a reckless or dangerous manner which could jeopardize the user's safety or the safety of others.
- Vehicle modifications, or failure to properly maintain
your vehicle, may change the handling characteristics
of your vehicle, and may negatively affect
the performance of the ESC system. Changes to the
steering system, suspension, braking system, tire
type and size or wheel size may adversely affect ESC performance. Improperly
inflated and unevenly
worn tires may also degrade ESC performance.
Any vehicle modification or poor vehicle maintenance that reduces the effectiveness of the ESC system can increase the risk of loss of vehicle control, vehicle rollover, personal injury and death.
ESC Operating Modes
NOTE: Depending upon model and mode of operation, the ESC system may have multiple operating modes.
ESC On
This is the normal operating mode for the ESC. Whenever the vehicle is started, the ESC system will be in this mode. This mode should be used for most driving conditions. Alternate ESC modes should only be used for specific reasons as noted in the following paragraphs.
Partial Off
The "Partial Off" mode is intended for times when a more spirited driving experience is desired. This mode may modify TCS and ESC thresholds for activation, which allows for more wheel spin than normally allowed.
This mode may be useful if the vehicle becomes stuck.
To enter the "Partial Off" mode, momentarily push the "ESC Off" switch and the "ESC Off Indicator Light" will illuminate. To turn the ESC on again, momentarily push the "ESC Off" switch and the "ESC Off Indicator Light" will turn off.
NOTE: For vehicles with multiple partial ESC modes a momentary button push will toggle the ESC mode.
Multiple momentary button pushed may be required to return to ESC On.
NOTE:
- When in "Partial Off" mode, the TCS functionality of ESC, (except for the limited slip feature described in the TCS section), has been disabled and the "ESC Off Indicator Light" will be illuminated. When in "Partial Off" mode, the engine power reduction feature of TCS is disabled, and the enhanced vehicle stability offered by the ESC system is reduced.
- Trailer Sway control (TSC) is disabled when the ESC system is in the "Partial Off" mode.
Full Off - If Equipped
This mode is intended for off-highway or off-road use only and should not be used on any public roadways. In this mode, TCS and ESC features are turned OFF. To enter the "Full Off" mode, push and hold the "ESC Off" switch for five seconds while the vehicle is stopped with the engine running. After five seconds, a chime will sound, the "ESC Off Indicator Light" will illuminate, and the "ESC OFF" message will display in the Electronic Vehicle Information Center (EVIC). To turn ESC ON again, momentarily push the "ESC Off" switch.
NOTE: System may switch from ESC Full Off to Partial mode when vehicle exceeds a predetermined speed.
When the vehicle speed slows below the predetermined speed the system will return to ESC Full Off.
ESC modes may also be affected by drive modes - if equipped.
WARNING!
- In the ESC "Full Off" mode, the engine torque
reduction and stability features are disabled.
Therefore, enhanced vehicle stability offered by the ESC system is unavailable. In an emergency evasive maneuver, the ESC system will not engage to assist in maintaining stability. "ESC Off" mode is intended for off-highway or off-road use only.
- With the ESC switched off, the enhanced vehicle stability offered by ESC is unavailable. In an emergency evasive maneuver, the ESC system will not engage to assist in maintaining stability. "Full Off" mode is only intended for off-highway or off-road use.
ESC Activation/Malfunction Indicator Light and ESC OFF Indicator Light
The "ESC Activation/Malfunction
Indicator
Light" in the instrument cluster will come on
when the ignition switch is turned to the ON
position. It should go out with the engine
running. If the "ESC Activation/Malfunction Indicator Light" comes on
continuously with the engine running, a
malfunction has been detected in the ESC system. If this
light remains on after several ignition cycles, and the
vehicle has been driven several miles (kilometers) at
speeds greater than 30 mph (48 km/h), see your authorized
dealer as soon as possible to have the problem
diagnosed and corrected.
The "ESC Activation/Malfunction Indicator Light" (located in the instrument cluster) starts to flash as soon as the tires lose traction and the ESC system becomes active.
The "ESC Activation/Malfunction Indicator Light" also flashes when TCS is active. If the "ESC Activation/ Malfunction Indicator Light" begins to flash during acceleration, ease up on the accelerator and apply as little throttle as possible. Be sure to adapt your speed and driving to the prevailing road conditions.
NOTE:
- The "ESC Activation/Malfunction Indicator Light" and the "ESC OFF Indicator Light" come on momentarily each time the ignition switch is turned ON.
- Each time the ignition is turned ON, the ESC system will be ON even if it was turned off previously.
- The ESC system will make buzzing or clicking sounds when it is active. This is normal; the sounds will stop when ESC becomes inactive following the maneuver that caused the ESC activation.
The "ESC OFF Indicator Light"
indicates the
customer has elected to have the Electronic
Stability Control (ESC) in a reduced mode.
Brake Assist System (BAS). Hill Start Assist (HSA). Traction Control System (TCS)
Electronic Roll Mitigation (ERM). Trailer Sway Control (TSC). Ready Alert Braking (RAB)
Other materials:
186 FBI pinion
The ring gear and pinion are serviced as a matched
set. Do not replace the pinion without replacing the
ring gear.
REMOVAL
(1) Remove differential assembly from axle housing.
(2) Mark pinion yoke and propeller shaft for
installation alignment.
(3) Disconnect propeller shaft from pinion yo ...