Leakage detection device for PCV passage, and vehicle

A leakage detection device configured to perform leakage detection in a positive crankcase ventilation passage including at least a fresh air line configured to allow a communication between a crank chamber and an intake passage that constitute an engine, the leakage detection device comprising:

• a pressure sensor provided in a branch line branching off from the fresh air line of the positive crankcase ventilation passage and to detect a pressure in the positive crankcase ventilation passage;
• a one-way valve provided upstream of the pressure sensor in the branch line, the one-way valve being configured to be opened when the fresh air line is under negative pressure and to be closed when the fresh air line is under positive pressure;
• one or more processors;
• and
• one or more memories storing instructions for causing the one or more processors to determine whether leakage occurs in the positive crankcase ventilation passage, based on the pressure in the positive crankcase ventilation passage when the positive crankcase ventilation passage is closed by a passage open-close valve, the passage open-close valve being provided upstream of the pressure sensor and coupling the fresh air line with the intake passage.