No
signals are received from the sensors directly after the installation
is complete.
Confirm that the antenna cables are connected to the receiver.
If the cables are connected, check to see if the system has been
programmed with the ID numbers of the sensors installed on the
vehicle. Refer to the operator’s manual “Programming
for Tire Sensors”.
Transmissions
are not being received at a tire location after a sensor was replaced
or a spare tire was installed.
The ID number for the sensor at the location is not programmed
into the system. Program the ID number of the new sensor into
its respective location in the system. Reference operator’s
manual “Replace Wheel Sensor or Rotating Tires”. If
the sensor in a tire does not respond during programming, dismount
the tire from the wheel to confirm that the sensor was installed.
If the sensor is present, but not functioning, replace it.
Pressure
deviation alert activates on one or more tires at start up when
the initial transmissions are received.
One or more tires are not properly inflated to the cold inflation
pressure (CIP) setting in the system. It is possible that the
affected tire has a puncture and is losing pressure. Confirm that
the affected tires are inflated to the recommended amount as indicated
on the vehicle’s Placard. If not, inflate or deflate the
affected tires as required and investigate the cause of the pressure
condition (was the tire improperly inflated after installation?).
If the affected tires are properly inflated, confirm that the
CIP setting in the system matches the recommended CIP values for
the vehicle. See operator’s manual “Programming Tire
Warning Setup Screens”.
Please note that the system software
assumes that tires are inflated to the programmed CIP value at
an ambient temperature of 65°F (18°C). If the actual tire
temperatures are higher than 65°F, initial inflation pressures
should be correspondingly higher.
Pressure
deviation alert activated on one or more tire locations after
a period of driving.
Confirm that the affected tires are properly inflated. If not,
inflate or deflate the affected tires by the amount indicated
in the alert and investigate the cause of the pressure condition.
Keep in mind that the inflation pressure of a tire hotter than
65°F (18°C) should be higher than the recommended cold
inflation pressure (CIP). If the affected tires are properly inflated,
confirm that the CIP setting in the system matches the recommended
CIP values for the vehicle. See operator’s manual “Programming
Tire Warning Setup Screens”. If the programmed CIP setting
matches the vehicle’s recommended CIP values, the systems
‘Slope’ setting may not be optimal. See operator’s
manual “Programming Tire Warning Setup Screens”.
Tire
pressure reading on the display does not match the pressure value
obtained from a hand-held gauge for one or more tire locations.
This condition can be the result of an inaccurate hand-held pressure
gauge, altitude, or because the wheel positions in the display
do not correspond to the tires the sensors are installed in. To
diagnose the problem:
1. Adjust the inflation pressures
of all tires to their recommended cold inflation pressure (CIP)
value using the hand-held gauge.
2. Drive the vehicle over 15 mph
(24kph) to activate the sensors. If the system indicates that
all tires are inaccurately inflated by approximately the same
amount, the problem is being caused by an inaccurate gauge or
the pressure differential caused by altitude. See “Solution:
Inaccurate Gauge” below.
3. If the display shows approximately
the same values as the hand-held gauge for all other tire locations,
stop the vehicle at your installation facility and, without powering
down the system, deflate one tire by approximately 5 – 10
PSI. Note: Once the vehicle has stopped moving, the sensors will
stay active for 15 minutes before going into a sleep mode. You
now have 15 minutes to diagnose the problem or the vehicle will
need to be driven over 15 mph (24 kph) again.
Confirm that the display shows the reduced pressure at the corresponding
wheel position. If it does not, the sensor installed in the deflated
tire is not programmed to the correct wheel position in the receiver.
If it does, that wheel position has been correctly programmed.
Repeat for all other tires on
the vehicle that do not match pressures to determine which sensor
ID numbers need to be reprogrammed. See “Solution: Sensor
ID Programming” below. Re-inflate tires to the recommended
cold inflation pressure (CIP).
Inaccurate Gauge
Most hand-held gauges have an accuracy rating of plus or minus
5 PSI. The tire system is far more accurate, measuring pressure
to an accuracy of plus or minus 1 PSI. As a result, the temperature
compensated pressure deviation values provided by the system should
be used over the non temperature compensated values provided by
the hand-held gauge. Inflate or deflate the tires until the pressure
deviation value for all tires is 0 PSI (plus or minus 1 PSI).
The tires will now be properly inflated.
Please note that since the sensors
measure tire pressure from the inside of the tire, they are not
influenced by changes in atmospheric pressure due to elevation.
If tire pressure levels are set with a hand-held gauge in a high
altitude region, the system will display somewhat lower pressure
values than the reading provided by the hand-held gauge. For example,
a tire inflated to its correct CIP in Denver CO (approx 5280 ft
above sea level) as measured using an accurate hand-held gauge
will show a -2.5 PSI difference on the system display as a result
of the elevation.
Sensor ID Programming
Reprogram the system by performing a tire rotation function using
the operator’s manual “Replace Wheel Sensor or Rotating
Tires” or by using the operator’s manual “Programming
for Tire Sensors” to reprogram the sensor ID numbers into
the correct wheel positions.
Note: Do not forget to re-inflate the tires to their proper CIP
values.
The
System initiates a Signal Lost error at one or more wheel positions
after a period of driving at interstate highway speeds.
Higher vehicle speeds can reduce the systems ability to capture
data from the sensors. Check antenna rods and clean away any excessive
dirt buildup. Straighten antennas if they are bent. Also, relocation
of an antenna may improve the signal strength of the system. If
the condition persists and the system has been in use for over
5 years under normal driving conditions, the battery in the sensor
installed at the affected wheel position may be discharged. Replace
the sensor.
One
or more wheel positions on the display are slow in being received
after starting a trip.
Transmissions are not being consistently received from one or
more wheel positions. Sensors are designed to transmit within
15 seconds of the vehicle moving 15 MPH. To improve signal reception,
check the antennas to confirm absence of dirt or damage and adjust
their position so that they have a clear line of sight to the
tires. Sensor signal strength may also be adversely affected by
tire additive liquids. If the condition persists, replace the
affected sensor.
High
Temperature alert is activated at one or more sensor locations
without a low pressure alert or warning.
Tire is irregularly hot. Radial ply tires normally operate well
below the activation threshold of the high temperature alert.
Therefore, if the high temperature alert is activated without
an earlier under inflation alert, the cause of the problem is
most likely radiated heat generated by a dragging or over worked
brake drum. Investigate possible causes and correct the condition.
Low
Pressure alert is activated at one or more sensor locations due
to very low ambient temperatures.
Tire manufactures never recommend inflating a tire less than the
specified cold inflation pressure. The beads of a commercial tire
can unseat if its pressure gets too low resulting in a catastrophic
tire failure. The general rule of thumb is to inflate a tire to
the recommended cold inflation pressure at temperatures below
65°F.
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