Toyota 25860-0P010 Valve Assy, Vacuum Switching

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It is a known fact that in components such as the fuel tank and intake manifold, gasoline retained while the engine is off either in the fuel tank or stored in components of the infused fuel system like the intake manifold warms up and evaporizes creating unburned hydrocarbon fuel vapors that otherwise would waste gas and pollute the air if let out. The EVAP system uses three vacuum hoses to collectively pull vapors that are from the fuel tank, throttle body, and intake manifold and store them in the charcoal canister until the car is back in use again. This canister that is packed with activated charcoal, acts to sop these vapors. When the engine is running, it expels the vapors into the intake manifold combining them with the incoming combustible air-fuel ratio. It mainly consists of an air filter, a canister, a pump module, refueling valve, and purge valve and the most of them are placed under the car near the canister. The fuel vapor purge control valve controls the amount of fuel vapor from the fuel tank to the canister during purge and refueling modes and the fuel vapor check valve minimizes the amount of vacuum that draws fuel vapors into the canister. This again blows fresh air from the atmosphere through the air filter, into the canister to replace expelled vapour. In the pump module, the vapor pressure sensor checks on the pressure and throws the switch to PCM to turn on the purge valve whenever the pressure builds up. Under favorable circumstances, the PCM sends a signal to open the purge valve, and gets the burned vapors to be drawn by the engine while fresh air replaces the purged vapors. The PCM also carries out a leakage test on the system with the aid of the vacuum pump and the vapor pressure sensor and retaining a Diagnostic Trouble Code if any. For the component replacement, the EVAP canister purge valve is on the left side of the intake manifold next to the EVAP canister with hoses connected to it first needs to be disconnected then the valve can be removed. The EVAP canister air filter is placed close to the canister, and the fresh air hose is from the filter; the replacement involves the removal of the ABS harness bracket and disconnecting of the hoses. To replace the EVAP canister and refueling valve the car has to be lifted, the air filter has to be unscrewed and set aside, several electrical connectors and hoses had to be disconnected and the canister has to be unbolted in order to be removed. The pump module is reached by pulling the EVAP canister (Figure 5, 6 & 7), disconnecting hoses and unbolting the module from the canister and vice-versa for installation.