Alfa Romeo 159 Training Material page 259

ELECTRICAL
SYSTEM
ignition (pressing PAV with brake/clutch pedal pressed)
vehicle speed > 10 km/h
vehicle speed error
engine running
state change to key-off
This strategy is needed to prevent the following cases:
key-off/on while travelling
vehicle towing with key-on
key-on while engine is running
vehicle towed and raised (vehicle speed error)
dynamometer test with engine running or not
Start/stop button (PAV) management
The PAV (ignition button) is located on the dashboard panel. It consists of a dual circuit button with double output
signal. Both signals are acquired by the NBS. The user's intension is determined by the transition of one of the two
signals.
The system will behave as follows in the event of start/stop button failure.
Start/stop button failure: always off
In the event of discrepancy between two signals, the NBS simply needs to acknowledge pressing of the button, by
means of one of the two PAV signals, to start/stop the engine.
In this case, an error which can be read in diagnostic mode, will be stored. Acknowledgement is only possible with
the CAN active in the event of a failure PAV signal. The network is woken up simply by opening a door of the vehicle.
Start/stop button failure: always on
To prevent undesired start-ups, the signal will be ignored if one or both the NBS inputs detect PAV pressure for 30
consecutive seconds until state change is detected. In both cases, steering is blocked when TEG is extracted and a
warning message is sent to the instrument panel.
From ignition to drive
The engine is started by pressing the start/stop button when the clutch or brake pedal is pressed (versions with
mechanical transmission) or when the brake pedal is pressed (versions with automatic/robotised transmission). The
loads will be switched off (key-off) if the start/stop button is pressed and the brake or clutch pedal is not pressed. The
NBS checks the following conditions before driving the starter motor when the start command is acknowledged:
Clutch/brake pedal pressed during +15 activation
+15 present confirmation signal also on B-CAN
Gearlever in park/neutral (automatic transmission versions)
Ignition enabled by NBC (Code checked).
The starter motor will be turned (+50) until the either the clutch/brake pedal or the start/stop button is released or for a
maximum time of 10 seconds. If ignition is correct, the NBS will check the engine speed signal on the network and
will mechanically lock the TEG in the TEG reader.
If the TEG lock is not successful, the engine can be started but the NBS will not switch loads off (key-off) when the
TEG is extracted from the reader. The PAV must be pressed to obtain key-off.
For versions with automatic/robotised gearbox, the gearlever must be in 'park/neutral' position to start the engine.
The procedure must be repeated, if it fails, with the gearlever in the correct position.
Traccia Didattica Alfa 159-en-ridotta.doc
ALFA 159 TRAINING MATERIAL
PAV (ignition button)
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