Mazda 2007 CX-9, Service Highlights

Page: 131 / 614

WHEEL AND TIRES
02-12–5
02-12
Component Parts/Function
End Of Sie
NG: WHEEL SENSOR
WHEEL UNIT CONSTRUCTION/OPERATION
id021200100900
Construction
•
The wheel unit is installed to the rim of each wheel with a nut. It monitors air pressure, temperature and
acceleration of the tire, and sends the data as RF signals.
•
The wheel unit also serves as a tire valve.
Operation
•
The wheel unit operates on a built-in battery, and regularly sends tire data as RF signals. The data it sends is
retrieved using a sensing function that monitors tire pressure and temperature, and a self-diagnostic function
that detects battery status and sensor malfunction.
•
To maximize the life of the built-in battery, the unit uses the detected air pressure and acceleration to determine
vehicle conditions such as driving and long stops, and operates in a mode appropriate to vehicle conditions so
that battery consumption is minimized.
•
Each wheel unit has its own identification code that is sent together with tire data and is used to verify which tire
has abnormal tire pressure. Therefore, when the wheel unit or the instrument cluster is replaced, the
identification codes must be configured.
Part name Function
Wheel unit
•
Monitors air pressure, temperature, and acceleration of each tire, and sends
RF signals.
•
Sends data if any abnormality is detected in the wheel unit.
Keyless receiver
•
With advanced keyless system: Send the RF signals received from the wheel
unit to the keyless CM.
•
With keyless entry system: Send the RF signals received from the wheel unit to
the instrument cluster.
Keyless CM (with advanced keyless
system)
•
Receives data from the keyless receiver.
•
Sends data to the instrument cluster.
PCM Vehicle speed signal
•
Inputs vehicle speed signals to the instrument cluster via CAN communication.
Instrument
cluster
•
Receives data from keyless CM (with advanced keyless system) or keyless
receiver (with keyless entry system) and monitor the air pressure of each
wheel. If it determines from those signals that tire pressure is abnormal, it
controls the TPMS warning light to alert the driver.
TPMS warning light
•
If the instrument cluster detects abnormal air pressure or any abnormality in
the system, the light is illuminated to alert the driver.
WHEEL UNIT
E5U212ZW5005
3423-1U-06H(02-12).fm 5 ページ ２００６年１１月２２日 水曜日 午前１１時１４分