Mopar 68231653AB CANISTER-Vapor

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The Evaporative Emissions Control (EVAP) is the system which controls emission of fuel system vapors, which contain We, unburned hydrocarbons. During hot days, gases formed within the fuel tank build upon the fuel and when pressure builds up, the fuel vapour vent valve and the fuel vapour control valve directs the fuel vapours to the EVAP canister for a temporary storage until it is burnt by the engine. In certain circumstances, PCM turns on fuel canister purge solenoid and with the help of intake manifold vacuum, fuel vapour enters into induction air/fuel mixture to supply for combustion. EVAP canister is installed in the right rear corner of the automobile and it is of activated charcoal type which does not require any service. The Natural Vacuum Leak Detection (NVLD) assembly located in the same area, is designed to measure the temperature of unburned hydrocarbon vapours; if the pressure temperature relationship is abnormal then it sends a signal to the PCM to set a Diagnostic Trouble Code (DTC). The canister purge solenoid controls the flow of the vapor from the canister to the intake manifold and this is controlled by the PCM. A defective EVAP system shows some symptoms such as a strong smell of fuel especially in a hot climate; there may be a problem with the filler cap, the hoses connections or the canister. On component replacement, the electrical connectors are disconnected, hoses get labeled and several components are removed whilst on installation it is just the opposite of removal. For the 2007 and later models, the EVAP filter and the Evaporative Emission System Monitor (ESIM) are an integrated part of the canister in the car and the Fuel Tank Pressure (FTP) sensor is in the fuel tank vent tube which, similar to the above explained, has to be disconnected to check.