Component Parts/Function; Tire Pressure Monitoring System (Tpms) Operation; Identification Code Recognition Function; Tire Pressure Determination And Warning Function - Mazda RX-8 2009 Service Highlights

Component Parts/Function

Part name
Wheel unit
Keyless receiver
Keyless CM (with advanced keyless
system)
PCM Vehicle speed signal
Instrument
cluster
TPMS warning light
End Of Sie

TIRE PRESSURE MONITORING SYSTEM (TPMS) OPERATION

NG: TIRE PRESSURE MONITORING SYSTEM CONTROL MODULE
! The instrument cluster monitors the tire pressure of each tire and the wheel units for abnormalities using the
received data. If any abnormality is found, it controls TPMS warning light to alert and notify the driver.
! The instrument cluster controls the following functions based on the received data:
Function list

Identification code recognition function

Tire pressure determination/warning
function
Identification Code Recognition Function
! Since the identification codes of wheel units mounted on the vehicle have been configured in the instrument
cluster, the instrument cluster can verify the identification codes sent from the wheel units against the
configured identification codes.
! When the received identification code agrees with the configured identification code, data such as tire pressure
is updated according to the received signal. When the identification code does not agree, that signal data is
ignored.

Tire Pressure Determination And Warning Function

! The instrument cluster determines the tire pressure status of each wheel by comparing tire pressure data
received from the wheel units with the preset values in the instrument cluster.
! If a malfunction is detected in the received signals, the instrument cluster flashes the TPMS warning light to
notify the driver of a tire malfunction.
! The informing/warning of an abnormal tire pressure determination takes precedence over the informing/
warning of a missing signal or malfunction determination.
Low-pressure determination
! When tire pressure data is lower than the detection value configured in the instrument cluster, the instrument
cluster determines that the tire for that wheel unit has low tire pressure.
— If low tire pressure is determined when the ignition is on, the TPMS warning light is illuminated.
— If low tire pressure is determined when the ignition is off, the instrument cluster performs an open-circuit
*1
check
on the TPMS warning light after the ignition is turned on, and then illuminates the TPMS warning
light.
WHEEL AND TIRES
! Monitors air pressure, temperature, and acceleration of each tire, and sends
RF signals.
! Sends data if any abnormality is detected in the wheel unit.
! 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.
! Receives data from the keyless receiver.
! Sends data to the instrument cluster.
! Inputs vehicle speed signals to the instrument cluster via CAN communication.
! 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.
! If the instrument cluster detects abnormal air pressure or any abnormality in
the system, the light is illuminated to alert the driver.
! Recognizes whether received signals are from own wheel units.
! Compares received tire pressure data with preset values. If the pressure is
determined to be too low, the instrument cluster alerts the driver via the TPMS
warning light.
Function
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