A: All gases change pressure as their temperature changes, and air or nitrogen are
no exceptions. A good rule of thumb is that tire pressure will change by about 1 psi
(7 kPa) when temperature changes by 10° F (6°C). Customers may experience this
as temperatures change from summer to fall and into winter - tire pressures will
drop as the outside temperature gets colder. Customers may also experience this as
temperatures change between mid-day and overnight.
Q: How should tire pressures be set at PDI?
A: Tire pressure should be set to the specified placard pressure at the lowest
seasonal temperature the vehicle will see during operation. The correct action to
avoid a CHECK TIRE PRESSURE message due to extreme temperature changes is to:
Use an accurate high quality tire pressure gauge. Let the vehicle sit and adjust tire
pressure to the specified value when tire temperature is at the lowest expected
temperature. Never set tire pressure below the placard value regardless of tire
temperature or ambient temperature On extremely cold days, if setting tire pressure
when the vehicle has been indoors, it may be necessary to compensate for the low
external temperature by adding 3-4 psi (21-27 kPa) more than the placard pressure.
When convenient, at some later time, when the tires are cold (outdoors), the
pressure should be re-checked and adjusted to placard if necessary.
Q: When will the J-46079 tool be updated?
A: TPM Software Version 3.5 has recently been shipped to each GM dealership in the
J 46079-30 TPM update kit. This update consists of two parts:
A hardware update kit which consists of a custom rechargeable battery pack,
battery cover with charging terminals, and a charging cradle with a smart
charger where the whole tool will fit into the cradle for charging (same concept
as a cordless phone). This hardware update substantially increases the life of
the batteries and will assure that the TPM Tester always has full battery
capacity.
The software update will add new vehicles and also improve the speed of the
tool’s read-back ability and accuracy. Sensor transmission signal strength is
displayed in the upper left corner of the main display next to the tool’s battery
level display. When the tool is used in both activate or scan mode, it will receive
the sensor’s transmission and indicate its signal strength. It is important to note
the sensor’s transmission signal strength since it is a good indication of an
accurate diagnostic.
Q: Where should the J-46079 tool be positioned when it is
being used?
A: Tool User Tip: The placement of the TPM Tester’s antenna when activating a
sensor is critical, especially with the latest software update. When activating a
sensor, the antenna tip of the TPM Test J 46079 must be placed on the sidewall,
perpendicular to the tire, and close to the valve stem. This will assure proper
activation of the sensor. If the antenna of the TPM Tester is placed either on the
valve stem or on the wheel itself, the tool may not properly activate the sensor,
causing improper diagnosis.
(7 Seiten)
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