1999 Plymouth Breeze P0340 Fault: Camshaft Position Sensor or Timing Issue?

I'm experiencing a P0340 diagnostic code on my 1999 Plymouth Breeze. The car starts and runs fine under normal conditions, but I notice rough starting—sometimes requiring multiple pumps of the gas pedal to get it started. Given that the engine does not stall or misfire during operation, I'm wondering if this is likely a camshaft position sensor issue or whether it could be related to timing or another sensor like the crankshaft position sensor. The P0340 code specifically indicates a problem with the camshaft position sensor. This sensor provides critical input for engine timing and ignition control. While the car runs, the signal is only needed during cranking; if the sensor fails completely, starting would be extremely difficult or impossible. However, since the vehicle starts eventually, it suggests the sensor may not be fully faulty but rather intermittent. I'm looking for guidance on how to diagnose these sensors: Are they resistance-based? Do they produce a 5V square wave signal at Top Dead Center (TDC)? What should I check for at the sensor contacts—such as corrosion, loose connections, or voltage drops? If replacing the camshaft position sensor is necessary, what are the risks and how can I confirm it's truly the cause before spending money on parts? I'm concerned about misdiagnosing this issue. Replacing a sensor without proper testing could lead to unnecessary expenses. What diagnostic steps should I take to rule out timing issues or other components?