The FSM usually lists diagnostic procedures for sensors and actuators. If you’re seeing smooth, consistent boost at expected levels for your tune and altitude, they’re most likely fine.
I’m sure you could test the bypass valve by applying shop air, and DC voltage to the pins in the harness connector to make sure the valve opens. If you can hear the high-pitch “SPPFFFFTTT” sound when you release the throttle under boost, it’s working fine. (Others May correct me here, but that’s my take.)
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Blue-ish 2006 2.4, Werks stage 1 turbo, Borla cat-back, DDM braces, Spec aluminum flywheel, Spec stage 2 clutch, Werks aluminum radiator, some gauges, RKSport hood, Morimoto FX-Rs, GReddy Profec, Norm's fenders
'07 GXP, RPM Stage 2, Solocatless downpipe, TCE Wilwood 6 piston front brakes, 4-piston rears , Stainless brake lines, slotted/drilled rotors, BC Racing BR coilovers, Performance Autowerks intercooler, DDMWorks CAI, charge pipes and braces