Automobile Engineering in ME
The basic purpose of a four wheel drive (4WD) system is that it

Ensures that effective braking can be performed, even on slippery surfaces
Delivers improved cornering on dry road surfaces
Ensures effective transmission of engine torque to all four wheels, even on slippery road surfaces
Eliminates the need of snow tyres, tyre chains, etc.

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Automobile Engineering in ME
The fuel pump of a programmed fuel injection (PFI) system operate for two seconds when the ignition is turned to the start position to

Pressurise the fuel system before the engine is started
Enable the pump's fault diagnosis function to operate
Supplies a large amount of fuel and thereby creates a choke effect
Warm up and lubricate the pump

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Automobile Engineering in ME
The basic function of the suspension is to

Ensure that the steering wheel can deliver a suitable amount of steering force
Absorbs vibration and impact forces from the road surface
Ensure that wheel alignment is not disturbed during driving
Automatically correct the effects of over steering

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