WHAT YOU MUST KNOW WHEN DRIVING 4x4 WHEEL DRIVE
1 - Push-button to engage 4WD
2 - Self-diagnosis system warning light
3 - 4-wheel drive engagement warning light.
The system is composed of a rear differential coupled to the engine unit
by a propeller shaft fitted with an electromagnetic coupling; this
mechanical device is controlled by an electronic control unit. Engagement
of 4WD is possible at any vehicle speed and is actuated by a push-button
(1).
Avoid maneuvering on high-adhesion road surfaces with the wheels
steered to locks and the 4WD engaged. Under this condition, even though
the reliability and strain resisting capabilities of the cars mechanical
components are not impaired, the vehicle will result in a braking action.
The device is provided with a self-diagnosis system and a special warning
light (2) on the dashboard, signaling any possible faulty condition of the control unit, the electromagnetic
coupling and the sensors. In such a case, 4WD is automatically disengaged thus preserving safety and reliability
levels. 4WD engagement is signaled by warning light (3).
Note
Thanks to a series of sensors, the system optimizes functionality and reliability in any condition:
- inhibiting engagement in case of speed difference between front and rear wheels;
- disengaging 4WD in case of Sharp braking and automatically engaging it when the brake pedal is released.
The system is also fitted with a mesh-control safety device, the operation of which is based on the detection,
performed by a coil installed near the coupling, of electromagnetic noises due to mesh failure. Said safety
device operates upon engagement driven either by the push-button switch or by brake pedal release (after
intervention of brake safety device).
How to chose which drive to utilize
Front-wheel drive only: this is most suitable on normal, dry roads, as it allows maximum savings in fuel
consumption, a more comfort-able drive and lower wear of mechanical parts.
4WD: this must be utilized in all those circum-stances when the road presents low adhesion values, I.e.
disconnected, wet, snowy or muddy roads and on sandy or muddy routes.
In general: it is recommended to utilize front wheel drive whenever road or atmospheric conditions do not
expressly required the use of 4WD.
Warning
Avoid utilizing the vehicle in a manner different to that for which it was designed: it is therefore recommended
not to use it as an “all terrain” vehicle. Furthermore follow the precautions listed hereunder:
- utilize tires of the same type and dimensions on all four wheels and ensure that inflation pressures are always
those pre-scribed;
- always check brake efficiency after having crossed muddy, sandy or wet terrains;
- when the fitting of snow-chains is required, mounted on-to the front wheels without engaging 4WD.
