Car Repair Help by Professional Mechanics
Troubleshooting
/ Low Tire
Pressure Indicator
Why is the Low Tire Indicator Light On?
Introduction:
The LTI (low tire indicator) was devised to help prevent accidents due to low
tire pressure. This system is beneficial for anyone that would like to know the
air pressure of the car tires as they drive. It also can alert you to a puncher
in the tire that is allowing air to escape. The LTI warning lights are a featured
safety device that is included on some cars. This air pressure monitoring system
is used to use feedback data created by the transponders inside each tire. A receiver
picks up the signal from the tire transponder and then sends the information across
an information bus which is connected to various processors. These processors then
compute information and then send a signal to an onboard diagnostic center which
includes a warning light located on the dash. Some vehicles include intergraded
remote service like
Onstar
that can send you a message on your phone that a low tire inductor has been
activated.
Low Tire Lamp Inductor
When a low tire indicator light illuminates all
tires air pressures
should be checked, including the spare tire. If you have inspected the air pressure
in all tires including
the spare tire and the indicator is still on this usually means one of two things.
Either a sensor in one of the tires has gone bad or the system requires a reset
procedure. If these actions still do not solve the problem you will need to determine
what your particular problem is. Diagnostic procedure information is determined
by the car manufacturer and a
service repair
manual is needed to obtain the manufacturer specific information. If all tires
including the spare tire pressure in within specifications and the LTI light is
still illuminated one of the feedback sensors in one of the tires has probably failed.
Preferred Procedure: It is best to check car tire air pressures
after the car has been standing for a few hours on cool pavement. The reason for
this is the air pressure in tires goes up slightly as you drive. This air expansion
is a normal occurrence created by natural fiction generated by rolling resistance.
To find the air pressure for your vehicle consult the driver's door jamb sticker
or find air pressure specifications by consulting a
car repair manual.
Common Problems
- When replacing a tire or normal tire services (flat tire) the air pressure
sensor can become damaged
- Air pressure gauge can be off (not within calibration specifications)
Troubleshooting
/ Low Tire
Pressure Indicator
Check Manufacturer Specific Low Tire
Pressure Questions and Answers
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