2003 Nissan Frontier 3.3L P0335 Crankshaft Position Sensor Code - PCM or Wiring Issue?

I own a 2003 Nissan Frontier 3.3L non-supercharged, automatic transmission, 2WD Desert Runner Edition. The vehicle originally came with a stripped timing belt. I recently replaced the timing belt and successfully reinstalled it—after which the engine started and runs smoothly. However, a persistent P0335 crankshaft position sensor fault code continues to appear. I have already replaced the crankshaft position (CKP) sensor twice, and both times the issue remains unresolved. All wiring appears intact with no visible damage or shorts. Given this, am I likely dealing with a faulty Powertrain Control Module (PCM)? Is there any way to test or diagnose the PCM independently? Any advice on next steps would be greatly appreciated.