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The flow back check valve is in the pump.
The pcv valve is located on the rear of the oil filler housing.
It is inside the transmission, on the valve body.
Part of the pump module in the tank.
4.0L does not have a PCV valve, it uses an orifice in the rear of the valve cover.
It doesn't have EGR
The 2002 Grand Vitara EGR valve is located on top of the engine. The EGR valve will be between the engine and the battery.
Its part of the liquid line on a Grand Cherokee and on a regular Cherokee you have an expansion valve located on the passengers side firewall..................
on a 4.0 it should be under the exhaust manifold
the random hose sticking out of the center of the valve cap
Check the vacuum operated valve at the hose going to the heater core.
The shift solenoid is inside the transmission on the valve body.