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a gate valve is a one way totally open or closed valve, a control valve is a variable valve.
There is no difference between check valve and NRV, both are same
I believe that servo is motorized and solenoid is magnetically activated.
The purpose of both the valves is same - that to maintain a certain level(in a vessel or tank...) Simple Level valve could be referred to an ON - OFF valve where as control valve could be referred to an analog type of valve. On - OFF valve is for a crude control of level, while control valve is used where a fine level control is needed.
XV is shutoff valve UV is under control valve
you might check your IAC valve (idle air control valve) check your TPS
check you heat control valve
Swirl Control Solenoid Valve
check your air idle control valve
check the idle air control valve
check for an emmission control system problem such as the heated cannister purge valve
check your idle air control valve
Check your vacuum lines and also check your idle air control valve. Make sure the IAC valve gasket is in good condition and that the valve itself is not loose.
check the heater control valve. these things tend to stick either open or closed. it may also be your blend door. check the heater control valve first, for you dont have to take the dash off.
It does not have a heater control valve.It does not have a heater control valve.
Evaporative canister purge control valve circuit fault. Check or have mechanic check.
Error code P1506 is for the idle air control overspeed. Remove the idle air control valve and clean it with carburetor cleaner and check for vacuum leaks. If the problem persists change the valve.