Suzuki SX4/SX4 SEDAN Owner's Manual page 9

LEAK DETECTION PUMP
NOTE:
Your vehicle has a pump to regularly check
the vehicle's evaporative emission control
system for leaks. This check is performed
approximately five hours after the engine is
turned off. During this leak check, you may
hear a sound coming from the vehicle for
several minutes. This sound is normal and
does not indicate a malfunction.
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