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

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

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

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Automobile Engineering in ME
The auto ignition in a spark ignition engine means

Ignition induced to supplement the process of normal combustion
Ignition of the charge before the passage of flame front
Ignition induced by the passage of a spark
Automatic ignition of the charge at the end of compression

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