scruffboy-
"Can you upgrade an NA to a cam position sensor, or would you have to swap out the ECU?"
Yep along with the ecu and engine harness. Must delete some sensors like boost sensor and front knock sensor from the GTE harness though. Not worth the effort/time/money for the minimal gains.
kidsusukigsxr-
"Could you tell me if there is a way to determine if my ECU is working?"
Yep, turn the ignition key to the on position, does the check engine light turn on? If not, then the ecu is not working. If it does turn on, then bridge terminals T and E1 at the diagnostic connector. Does the check engine light flash 4 times a second? If so, it works and everything is working fine. If it flashes other than 4 times a second you have DTC's stored in your ECU which means the ECU is working, but something else is not.
"should there be any other wire connected to it"
Yep, each coil should have a 2 wire harness connected to it, 1 for each coil pack, 3 in all. There should also be a small gauge single wire that connects from the coil bracket to a stud on the intake manifold side of the head, this is a ground cable. I can post pics if you need them.
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