Tyre Pressure Monitoring System; Initiator; Control Unit; Operating Details - Alfa Romeo 159 Training Material
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Also See for 159:
- Owner's handbook manual (338 pages) ,
- Owner's manual (330 pages) ,
- User manual (8 pages)
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ELECTRICAL
SYSTEM
9.5.5 Tyre pressure monitoring system
The sensor is fitted on the wheel rim according to the various configurations (pressed steel or die-cast alloy). The
sensor is capable of measuring pressure and temperature via specific transducers and to transmit to the ECU via RF
(433.92 MHz for the European market, 315 MHz for other markets). Communication with the energiser is performed
at 125kHz.
9.5.6 Initiator
The initiator is a ferrite based antenna located near the wheelhouse.
It has a three-wire interface (power, ground and 125KHz modulated signal).
The 125KHz signal must be appropriately amplified to ensure correct operation of the system in all working conditions
(environmental range, power voltage range, perturbed field). The typical operative range is one metre.
9.5.7 Control unit
The microprocessor control unit manages RF transmission and reception.
Control software is present in the ECU.
The ECU is provided with A-Bus and diagnostic K line interface. It must be provided with an auto location system
capable of provided tyre pressure indications immediately at key-on.
The ECU must ensure at least the following functions:
1.
Querying each sensor and providing information to the user in 10 to 15 seconds identifying each wheel.
2.
Managing tyre changes without need to reprogram the ECU externally.
3.
Self-learning of wheel sensor identification codes at end of line.
9.5.8 Operating details
The tyre pressure ECU (CPP) acquires information on the state of the four tyres via radio-frequency. A sensor is
queried at key-on by being energised by the respective initiator. One initiator is provided for each of the four wheels.
The CPP communicates on the A-Bus serial line with the NBC.
The NBC transmits the following signals on the B-Can line:
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