Controller Area Network (Can) Outline; Transmitted Information; Received Information From Pcm - Mazda RX-8 2004 Service Highlights

High-pressure determination
• When tire pressure data sent from the wheel unit exceeds the upper limit, the module determines that the tire
for that wheel unit has high tire pressure.
— If high tire pressure is determined when the ignition is on, the TPMS control module illuminates the TPMS
warning light built into the instrument cluster and sounds the TPMS warning buzzer for 3 s to alert the
driver.
— If high tire pressure is determined when the ignition is off, the module performs an open-circuit check
the TPMS warning light after the ignition is turned on, and then illuminates the TPMS warning light and
sounds the TPMS warning buzzer for 3 s to alert the driver.
• A high-pressure determination is cleared if tire pressure data from the applicable wheel unit is lower than the
specified recovery value.
— If the determination is cleared when the ignition is on, the TPMS control module turns off the TPMS warning
light.
— If the determination is cleared when the ignition is off, the module performs an open-circuit check
TPMS warning light after the ignition is turned on and turns off the TPMS warning light.
*1
: The TPMS control modules turns on the TPMS warning light for 3 s after the ignition is turned on for an
open-circuit check of the TPMS warning light.
UPPER LIMIT
AIR PRESSURE
TPMS
WARNING
LIGHT
TPMS
WARNING
BUZZER
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CONTROLLER AREA NETWORK (CAN) OUTLINE

• The TPMS control module transmits/receives information using the CAN system. See Section 09 for detailed
information regarding the CAN system.

Transmitted Information

• TPMS warning light on request
• TPMS warning buzzer on request

Received Information from PCM

• Vehicle speed
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WHEEL AND TIRES
ON
OFF
ON
OFF
3 S
DETECTED
AIR PRESSURE
SPECIFIED
AIR PRESSURE
*1
on
02–12
*1
on the
CHU0212S005
CHU021267502S02
02–12–9