Mazda CX-5 Service & Repair Manual: Tire Pressure Monitoring System (TPMS)

Mazda CX-5 Service & Repair Manual / Suspension / Wheels, Tires / Tire Pressure Monitoring System (TPMS)

Purpose, Outline

The tire pressure monitoring system monitors the tire pressure of all 4 tires. If the tire pressure of 1 tire or more becomes excessively low, the driver is notified.
A tire pressure monitoring system has been adopted which indirectly inspects the tire pressures and warns the driver.
A switch for initializing the tire pressure monitoring system after the tire pressures have been adjusted is installed to the instrument cluster..

System structural view

System wiring diagram

Function

The tire pressure monitoring system consists of the following parts.


Part name		Function
DSC HU/CM		Calculates the change in tire pressure based on the signals from each sensor and monitors the change in status. When it is determined that a tire pressure decreases below the specified value based on the initialization, the tire pressure monitoring system warning light is illuminated. The tire pressure monitoring system warning light illumination signal is sent to the instrument cluster via a CAN signal. If a malfunction occurs in the tire pressure monitoring system, determination is made to flash the tire pressure monitoring system warning light. The tire pressure monitoring system warning light flash signal is sent to the instrument cluster via a CAN signal.
ABS wheel-speed sensor		The wheel speed is sent to the DSC HU/CM.
Ambient temperature sensor		The ambient temperature is sent to the PCM.
PCM		The ambient temperature is sent to the DSC HU/CM via a CAN signal.
PCM	BARO sensor	The atmospheric pressure is sent to the DSC HU/CM via a CAN signal.
Instrument cluster	Tire pressure monitoring system warning light	The tire pressure monitoring system warning light illuminates by the illumination signal from the DSC HU/CM. The tire pressure monitoring system warning light flashes for approx. 1 min by the flash signal from the DSC HU/CM, and then it illuminates.
Instrument cluster	Tire pressure monitoring system warning alarm	The tire pressure monitoring system warning alarm sound is triggered by the warning alarm request signal from the DSC HU/CM.
Instrument cluster		The initialization signal is sent to the DSC HU/CM via a CAN signal.
Tire pressure monitoring system set switch		The initialization signal is sent to the instrument cluster.

Operation

The tire pressure monitoring system operates as shown in the following figure.

Mis-use prevention logic

If the tire pressure monitoring system is initialized without adjusting the tire air pressures even though the tire pressure monitoring system warning light illuminated, the tire pressure monitoring system has a mis-use prevention logic which illuminates the tire pressure monitoring system warning light.

The data for the tire pressure at the point in time when the tire pressure monitoring system warning light was illuminated is compared to the data for the tire pressure at the point in time when the tire pressure monitoring system initialization was performed.

If the difference in pressure is within the specification, the tire pressure monitoring system warning light is illuminated.

This mis-use prevention logic operates two times.
The mis-use prevention logic operates as shown in the following figure.

Tire pressure monitoring system warning light does not illuminate

Even if the tire pressure monitoring system is normal, if the following items apply, the tire pressure monitoring system warning light may not illuminate.

Brake pedal is depressed

DSC is operating

Sudden steering wheel maneuvering

Sudden acceleration/deceleration

When vehicle is parked, stopped

Tire pressure monitoring system does not operate normally

If the following items apply, the tire pressure monitoring system may not operate correctly.

Initialized using tire pressure outside of tire pressure specification

Tire pressure suddenly decreases (Ex. tire burst)

During tire pressure monitoring system learning

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Tire Pressure Monitoring System Initialization Procedure

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