The Nissan Murano Canister Purge Valve captures trapped fuel vapors from the charcoal canister and meters them into the intake so that the gasoline is burned instead of venting into the air. Located between the tank-mounted charcoal canister and the engine manifold, the Canister Purge Valve opens when the engine control module senses the right temperature and load. A vacuum pulls air through the charcoal, which is mixed with hydrocarbons and sent to the cylinders for clean combustion. Earlier generations of the Murano applied a simple vacuum-controlled Canister Purge Valve as part of Nissan development that opened whenever manifold vacuum peaked. Newer Murano generations use a computer-commanded Canister Purge Valve. This is connected to on-board diagnostics and gives the computer the ability to close or open the passage. During the self-tests, this checks the passage for leaks. This upgraded Canister Purge Valve works with a vent solenoid and fuel tank pressure sensor to make a sealed circuit, so the module verifies that vacuum holds. When it does not, the check engine lamp comes on to alert the driver. Despite these changes, both versions have the same objective of reducing the smog-forming hydrocarbons and keeping every Nissan Murano within emission limits.
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