Sensing Function; Self-Diagnostic Function; Tire Pressure Monitoring System (Tpms) Operation; Identification Code Recognition Function - Mazda CX-9 2007 Service Highlights

Sensing Function

• The sensing function periodically monitors the following data and sends it to the keyless receiver.
— Tire pressure
— Tire temperature
— Tire acceleration
— Voltage of the built-in battery
• Intervals of tire data monitoring and data transmission to the keyless receiver differ depending on the
operational mode (varies according to vehicle conditions).

Self-diagnostic Function

• The self-diagnostic function continuously performs malfunction diagnosis for each sensing function item. If any
abnormality is found by the malfunction diagnosis, the data is sent to the keyless receiver.
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NG: TIRE PRESSURE MONITORING SYSTEM CONTROL MODULE

TIRE PRESSURE MONITORING SYSTEM (TPMS) OPERATION

• 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.
02-12–6
WHEEL AND TIRES
• 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.
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