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Answer :
Final answer:
The EONV system monitors the EVAP system by monitoring fuel tank pressure. This ensures the EVAP system's efficiency and environmental compliance by detecting leaks early. This process is crucial for maintaining vehicle efficiency and reducing emissions. Thus the correct answer is option d) It monitors fuel tank pressure.
Explanation:
The question is about how the EVAP (Evaporative Emission Control) system is monitored by the EONV (Engine Off Natural Vacuum) system. The correct answer is d) It monitors fuel tank pressure. The EVAP system is designed to prevent gasoline vapors from escaping into the atmosphere from your fuel tank and fuel system. The EONV system, specifically, monitors the EVAP system by checking the pressure within the fuel tank. If the pressure falls outside expected parameters, it could indicate a leak in the system, which the EONV system is designed to detect. This is crucial for maintaining vehicle efficiency and reducing emissions.
The EONV system's monitoring capabilities are especially important for identifying and addressing leaks early on, helping to ensure the system's efficiency and environmental compliance. This function is distinct from those mentioned in options a, b, and c, which involve components like the leak detection pump, vent valve, and purge control solenoid, each playing different roles in managing fuel vapors and pressure but not directly involved in how the EONV system monitors the EVAP system.
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