Tire idiot light: Crazy from the heat?
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Re: Tire idiot light: Crazy from the heat?
Originally Posted by RPM
My tire pressures are supposed to be 36psi all around (per the door sticker).
I seem to recall that it alerts the driver when the overall system loses pressure equivalent ti 1/4 if a single tire's recommended pressure. So, at 35 per tire, 140 combined, it warns you when it hits about 130.
Every cold snap in the weather or tire leak, it warned me. The light went back off when the pressure was restored.
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Re: Tire idiot light: Crazy from the heat?
Originally Posted by RPM
My tire pressures are supposed to be 36psi all around (per the door sticker).
Dobro, did the light go off? Maybe your TPMS needs to be reset. The dealer has to do that.
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Re: Tire idiot light: Crazy from the heat?
The manual is a good source of the details of the TPS. There quite a few twists. For example if the car is turned on and stationary for an extended period the light can come on. The sensor shuts off when the car doesn't move. In this example when you start to drive, it should clear.
There are probably other little gotchas.
As my friends in the Jeep group always used to say:
"RTFM"
In case one is not available...
There are probably other little gotchas.
As my friends in the Jeep group always used to say:
"RTFM"
In case one is not available...
Each tire pressure sensor/transmitter serves three functions:
²
It is used as a valve stem to inflate and deflate the tire.
²
It periodically measures tire pressure. (Approximately every 30 seconds.)
²
It transmits the tire pressure value to the low tire pressure warning module in the vehicle. (Approximately
every 60 seconds or if tire pressure changes by one psi or more between transmissions.)
The system operates by monitoring a radio frequency transmission from the sensor/transmitters located in each
wheel. When the vehicle reaches a speed of approximately 32 km/h (20 mph), centrifugal force created by the rotating
wheels closes a roll switch inside each sensor/transmitter, powering up the circuitry.
The sensor/transmitters will only send out information when vehicle speed is above 32 km/h (20 mph). To facilitate
transmitting the radio signal to the TPM module, the valve stem acts as the antenna for the tire pressure sensor/
transmitter. When the TPM module senses that pressure is below one of two calibrated thresholds, (low pressure or
critical pressure) the TPM system will set a diagnostic trouble code and indirectly operate the “Low Tire” pressure
indicator lamp and the chime tone through the body control module (BCM).
The tire pressure sensor/transmitter is powered by an internal battery. The battery is not replaceable separately. In
the event of battery failure, the entire tire pressure sensor/transmitter at that wheel will require replacement. To
extend the life of the battery, the sensor/transmitter is not activated until the vehicle reaches a speed of approximately
32 km/h (20 mph) as stated earlier.
Each tire pressure sensor/transmitter has a unique identity code. This will allow the TPM system to indicate to a
technician, through diagnostic trouble codes in the module, which tire of the vehicle has lost air pressure. This code
is also used to identify to a technician which pressure sensor/transmitter has set a diagnostic trouble code. For this
reason, if a tire pressure sensor/transmitter needs to be replaced, the new sensor/transmitter must be programmed
to have its identity code recognized by the receiver.
every 60 seconds or if tire pressure changes by one psi or more between transmissions.)
The system operates by monitoring a radio frequency transmission from the sensor/transmitters located in each
wheel. When the vehicle reaches a speed of approximately 32 km/h (20 mph), centrifugal force created by the rotating
wheels closes a roll switch inside each sensor/transmitter, powering up the circuitry.
The sensor/transmitters will only send out information when vehicle speed is above 32 km/h (20 mph). To facilitate
transmitting the radio signal to the TPM module, the valve stem acts as the antenna for the tire pressure sensor/
transmitter. When the TPM module senses that pressure is below one of two calibrated thresholds, (low pressure or
critical pressure) the TPM system will set a diagnostic trouble code and indirectly operate the “Low Tire” pressure
indicator lamp and the chime tone through the body control module (BCM).
The tire pressure sensor/transmitter is powered by an internal battery. The battery is not replaceable separately. In
the event of battery failure, the entire tire pressure sensor/transmitter at that wheel will require replacement. To
extend the life of the battery, the sensor/transmitter is not activated until the vehicle reaches a speed of approximately
32 km/h (20 mph) as stated earlier.
Each tire pressure sensor/transmitter has a unique identity code. This will allow the TPM system to indicate to a
technician, through diagnostic trouble codes in the module, which tire of the vehicle has lost air pressure. This code
is also used to identify to a technician which pressure sensor/transmitter has set a diagnostic trouble code. For this
reason, if a tire pressure sensor/transmitter needs to be replaced, the new sensor/transmitter must be programmed
to have its identity code recognized by the receiver.
Re: Tire idiot light: Crazy from the heat?
recently seen on page 68 in your glove compartment...
TIRE PRESSURE MONITOR SYSTEM
TIRE PRESSURE MONITOR SYSTEM
The Tire Pressure Monitor (TPM) system uses wireless
technology to monitor tire pressure levels. Sensors
mounted to each wheel as part of the valve stem transmit
tire pressure readings to a receiver located inside the
vehicle.
technology to monitor tire pressure levels. Sensors
mounted to each wheel as part of the valve stem transmit
tire pressure readings to a receiver located inside the
vehicle.
NOTE:
The TPM system can inform you about a low
tire pressure condition, but it does not replace normal tire
maintenance. The TPM system is not intended to provide
you with notification of rapid tire pressure loss.
tire pressure condition, but it does not replace normal tire
maintenance. The TPM system is not intended to provide
you with notification of rapid tire pressure loss.
The TPM system is designed to monitor your tire
pressure and will not function as a tire pressure gauge.
After adjusting the air pressure in a tire, there will be
a delay before the system updates the display.
The TPM system will cause the indicator lamp in the
instrument cluster to illuminate whenever the pressure in
one tire falls 25% below the recommended pressure
shown on the vehicle’s tire label.
instrument cluster to illuminate whenever the pressure in
one tire falls 25% below the recommended pressure
shown on the vehicle’s tire label.
NOTE:
The pressure in your tires changes with temperature.
A significant decrease in temperature could
reduce cold inflation pressure below the TPM setpoint.
For example, tires inflated to the proper cold inflation
pressure on a warm day or in a warm garage could
illuminate the TPM indicator lamp on the following day
if the temperature is very cold. ALWAYS check the
pressure in your tires if the TPM lamp is illuminated.
A significant decrease in temperature could
reduce cold inflation pressure below the TPM setpoint.
For example, tires inflated to the proper cold inflation
pressure on a warm day or in a warm garage could
illuminate the TPM indicator lamp on the following day
if the temperature is very cold. ALWAYS check the
pressure in your tires if the TPM lamp is illuminated.
CAUTION!
The TPM system has been optimized for the original
equipment tires and wheels. TPM system pressures
have been established for the tire size equipped on
your vehicle. Undesirable operation or sensor damage
may result when using replacement equipment
that is not of the same size, type, and/or style.
Aftermarket wheels can cause sensor damage. Do
not use aftermarket tire sealant or balance beads, as
damage to the sensors may result.
NOTE:
equipment tires and wheels. TPM system pressures
have been established for the tire size equipped on
your vehicle. Undesirable operation or sensor damage
may result when using replacement equipment
that is not of the same size, type, and/or style.
Aftermarket wheels can cause sensor damage. Do
not use aftermarket tire sealant or balance beads, as
damage to the sensors may result.
NOTE:
The standard TIREFIT system (refer to What To
Do In Emergencies for more information) is specifically
designed to operate in conjunction with the TPM system,
and will not damage the sensors.
If your tire pressure is low, you should correct your tire
inflation pressure as soon as possible and inspect all of
your tires. Low tire pressure will cause the tire pressure
light to illuminate and the alert will sound. They will
remain on for the rest of the driving cycle, or until the tire
pressure is corrected.
In addition to monitoring tire pressures, the TPM system
also monitors faults within the system. If the TPM light
and alarm continue after the tire pressure has been
corrected, see your authorized dealer.
Do In Emergencies for more information) is specifically
designed to operate in conjunction with the TPM system,
and will not damage the sensors.
If your tire pressure is low, you should correct your tire
inflation pressure as soon as possible and inspect all of
your tires. Low tire pressure will cause the tire pressure
light to illuminate and the alert will sound. They will
remain on for the rest of the driving cycle, or until the tire
pressure is corrected.
In addition to monitoring tire pressures, the TPM system
also monitors faults within the system. If the TPM light
and alarm continue after the tire pressure has been
corrected, see your authorized dealer.
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