P0302 Fault Diagnosis: How to Test Coil Pack Power Wire Connection on 2002 Nissan Altima 2.5?

I'm experiencing a recurring P0302 fault on my 2002 Nissan Altima 2.5 engine. The vehicle runs normally at idle and low speeds, but the issue becomes apparent when the engine reaches operating temperature. I've already ruled out intake manifold leaks and other common causes, but I'm still unable to identify the root of this problem. My main concern is testing the power connection to the coil pack—specifically the wire that connects to the power-on plug on the ignition coil. I'm unsure how to properly verify if the electrical connection meets specifications. Does anyone have experience with this issue on a 2002 Nissan Altima 2.5? Is there a known failure point related to the coil pack's power wiring or the sensor signal? I would appreciate any advice, especially on how to safely and accurately test the power wire connection using a multimeter or other diagnostic tools. Any real-world solutions from owners who've faced this P0302 code on their 2002 Nissan Altima 2.5 would be greatly helpful.