Loading ...
Loading ...
Loading ...
SAFETY 195
Tire Pressure Monitoring System (TPMS)
The Tire Pressure Monitoring System (TPMS) will warn the
driver of a low tire pressure based on the vehicle recom-
mended cold placard pressure.
The tire pressure will vary with temperature by approxi-
mately 1 psi (7 kPa) for every 12°F (6.5°C). This means that
when the outside temperature decreases, the tire pressure
will decrease. Tire pressure should always be set based on
cold inflation tire pressure. This is defined as the tire pres-
sure after the vehicle has not been driven for at least three
hours, or driven less than 1 mile (1.6 km) after a three hour
period. The cold tire inflation pressure must not exceed the
maximum inflation pressure molded into the tire sidewall.
The tire pressure will also increase as the vehicle is driven.
This is normal and there should be no adjustment for this
increased pressure.
Refer to “Tires” in “Servicing And Maintenance” for infor-
mation on how to properly inflate the vehicle’s tires.
The TPMS will warn the driver of a low tire pressure if the
tire pressure falls below the low-pressure warning limit for
any reason, including low temperature effects and natural
pressure loss through the tire.
The TPMS will continue to warn the driver of low tire pres-
sure as long as the condition exists, and will not turn off until
the tire pressure is at or above the recommended cold
placard pressure. Once the low tire pressure warning (Tire
Pressure Monitoring Telltale Light) illuminates, you must
increase the tire pressure to the recommended cold placard
pressure in order for the “Tire Pressure Monitoring Telltale
Light” to turn off.
The system will automatically update and the “Tire Pressure
Monitoring Telltale Light” will turn off once the system
receives the updated tire pressures. The vehicle may need to
be driven for up to 20 minutes above 15 mph (24 km/h) in
order for the TPMS to receive this information.
For example, your vehicle may have a recommended cold
(parked for more than three hours) placard pressure of 33 psi
(227 kPa). If the ambient temperature is 68°F (20°C) and the
measured tire pressure is 28 psi (193 kPa), a temperature
drop to 20°F (-7°C) will decrease the tire pressure to approx-
imately 24 psi (165 kPa). This tire pressure is low enough to
turn ON the “Tire Pressure Monitoring Telltale Light.”
Driving the vehicle may cause the tire pressure to rise to
approximately 28 psi (193 kPa), but the “Tire Pressure Moni-
toring Telltale Light” will still be on. In this situation, the
“Tire Pressure Monitoring Telltale Light” will turn off only
after the tires are inflated to the vehicle’s recommended cold
placard pressure value.
4
2020_JEEP_CHEROKEE_OM_USA=GUID-B9F8E23F-10A5-4D6C-A585-BCFF41CCB747=1=en=.book Page 195
Loading ...
Loading ...
Loading ...