per previous post, it's behind the t/b facing the firewall. it is held on by two bolts and has two small coolant lines connecting to it.

since the zc is pre-obd and jdm, your evap purge solenoid connector is probably going unused. make sure it didn't accidentally get plugged in to your iacv. the connectors are identical and easy to mix up. i know from experience.

if everything is connected correctly, try removing it and cleaning the screen. last resort would be to try a known good iacv.