3-31OPERATING YOUR VEHICLE
79K21-03E
How the ABS WorksA computer continuously monitors wheel
speed. The computer compares the
changes in wheel speed when braking. If
the wheels slow suddenly, indicating a
skidding situation, the computer will
change braking pressure several times
each second to prevent the wheels from
locking. When you start your vehicle or
when you accelerate after a hard stop, you
may hear a momentary motor or clicking
sound as the system resets or checks
itself.
Electronic Stability Program
(ESP
®)
ESP
® is a registered trademark of Daimler
AG.
The Electronic Stability Program (ESP
®)
helps to control the vehicle during corner-
ing if front wheels or rear wheels skid. It
also assists you in maintaining traction
while accelerating on loose or slippery
road surfaces. It does this by regulating the
engine’s output, and by selectively apply-
ing the brakes. In addition, ESP
® helps to
avoid skidding by controlling braking pres-
sure.The ESP
® has the following three systems:
Stability Control SystemThe vehicle stability control system helps
provide integrated control of systems such
as anti-lock brakes, traction control, engine
control, etc. This system automatically
controls the brakes and engine to help pre-
vent the vehicle from skidding when cor-
nering on a slippery road surface or when
turning the steering wheel abruptly.Traction Control SystemThe traction control system automatically
helps prevent the spinning of wheels when
the vehicle is started or accelerated on
slippery road surfaces. The system oper-
ates only if it senses that some of the
wheels are spinning or beginning to lose
traction. When this happens, the system
operates the front or rear brakes and
reduces engine power to limit wheel spin.
NOTE:
You may hear a clicking sound in the
engine compartment for a few seconds
when you start the engine or just after the
vehicle begins to move. This means that
the above systems are in the self-check
mode. This sound does not indicate a mal-
function.
WARNING
The ABS may not work properly if
tires or wheels other than those
specified in the owner’s manual are
used. This is because the ABS works
by comparing changes in wheel
speed. When replacing tires or
wheels, use only the size and type
specified in this owner’s manual.
WARNING
The ESP
® cannot enhance the vehi-
cle’s driving stability in all situations
and does not control your vehicle’s
entire braking system. The ESP
® can-
not prevent accidents, including
those resulting from excessive speed
in turns, or hydroplaning. Only a safe
and attentive driver can prevent acci-
dents. The capabilities of an ESP
®-
equipped vehicle must never be used
as a substitute for careful driving.
3-40
OPERATING YOUR VEHICLE
79K21-03E
on the tire information placard should
cause the low tire pressure warning light to
turn off.
If the light turns on again shortly after
adjusting the pressure in your tires, you
may have a flat tire. If you have a flat tire,
replace it with the spare tire. Refer to
“Jacking Instructions” in the “EMER-
GENCY SERVICE” section. Refer to
“Replacing Tires and/or Wheels” for
instructions on how to restore normal oper-
ation of the tire pressure monitoring sys-
tem after you have had a flat tire.
NOTE:
When the tire inflation pressure is
adjusted in high altitude areas, the low
tire pressure light may not turn off even
after tire inflation pressure adjustment.
In this case, adjust the inflation pressure
to a slightly higher pressure than is
shown on the tire information placard.
The low tire pressure warning light may
turn off temporarily after coming on. This
could be due to surface temperature
increases after long distance driving or
traveling to a high temperature area.
Even if the tire pressure warning light
turns off after coming on, make sure to
check the inflation pressure of all tires.
To reduce the chance that the low tire
pressure warning light will come on due
to normal changes in temperature and
atmospheric pressure, it is important to
check and adjust the tire pressureswhen the tires are cold. Tires that
appear to be at the specified pressure
when checked after driving, when the
tires are warm, could have pressure
below the specification when the tires
cool down. Also, tires that are inflated to
the specified pressure in a warm garage
may have pressure below the specifica-
tion when the vehicle is driven outside in
very cold temperature. If you adjust the
tire pressure in a garage that is warmer
than the outside temperature, you
should add 1 psi to the recommended
cold tire inflation pressure for every 10°F
difference between garage temperature
and outside temperature.
For tire inflation pressure information, refer
to “Tire Inflation Pressure” in the “INSPEC-
TION AND MAINTENANCE” section.
TPMS Malfunction Indicator
When you turn off the engine, however, the
malfunction indicator resets. It takes about
ten minutes after restarting the engine for
the malfunction to be detected again and
for the light to start flashing.
WARNING
Your vehicle has also been equipped
with a TPMS malfunction indicator to
indicate when the system is not oper-
ating properly.
WARNING
The TPMS malfunction indicator is
combined with the low tire pressure
telltale. When the system detects a
malfunction, the telltale will flash for
approximately one minute and then
remain continuously illuminated.
This sequence will continue upon
subsequent vehicle start-ups as long
as the malfunction exists.
WARNING
When the malfunction indicator is
illuminated, the system may not be
able to detect or signal low tire pres-
sure as intended. TPMS malfunctions
may occur for a variety of reasons,
including the installation of replace-
ment or alternate tires or wheels on
the vehicle that prevent the TPMS
from functioning properly. Always
check the TPMS malfunction telltale
after replacing one or more tires or
wheels on your vehicle to ensure that
the replacement or alternate tires and
wheels allow the TPMS to continue to
function properly.
