Tyre Pressure Detection System; Overview; Structure - Alfa Romeo 159 Training Material

ELECTRICAL
SYSTEM
Hands-free cellular phone use without needing to operate the telephone itself (i.e. the telephone needs to be
inside the car but not necessarily reachable).
Voice recognition call (in 'Speaker dependent' and 'Speaker independent' modes).
Copying of personal numbers from telephone to on-board module and reading on on-board panel.
Display interaction for called numbers, incoming calls and incoming text messages.
Access to normal telephone functions (answer, reject calls, recall back number, etc.) using buttons on the
steering wheel.

9.5 TYRE PRESSURE DETECTION SYSTEM

9.5.1 Overview

The TPMS (Tyre Pressure Monitoring System) checks tyre inflation pressure and informs the driver if the pressure or
temperature of one or more tyres is out of range. Tyre state information is shown to the driver by means of visual
signals on the panel. Acoustic warnings are associated to the panel signals for the most critical cases (e.g. badly
deflated tyre).
The anomalies concerning one or more tyres detected by the system are:
deflated tyre
very deflated or punctured tyre
excessively inflated tyre

9.5.2 Structure

The tyres pressure monitoring system consists of:
One RF management and reception unit (CPP) located under the dashboard
Four RF pressure sensors located inside the tyre on wheel rims
Four LF (low frequency) initiators (antennas) located in each wheelhouse.
The system also uses the on-board panel to provide acoustic and visual information to the user:
One indicating icon combined with the display indicating:
Tyre pressure in the event of deflated or excessively inflated tyre(s)
Low tyre pressure in the event of punctures or very deflated tyres and acoustic warning buzzer
Tyre pressure monitoring function not available in the event of system failures with acoustic warning
buzzer
Each warning is associated with an indication of the wheel that caused the anomaly: front left, rear left, etc. as shown
in the diagram below:
The system structure is shown in the following figure:
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