To troubleshoot a potential PCM issue, you need to consult your owner's manual's fuse and relay diagrams. Look for fuses related to:
* Ignition system: A faulty ignition system could prevent the PCM from receiving power.
* Power distribution: Fuses protecting the main power feed to the PCM.
* Engine control: Fuses that specifically protect circuits related to the engine's computer systems.
Important Note: Before attempting any troubleshooting, disconnect the negative battery terminal to prevent accidental shorts and damage. If you're not comfortable working with automotive electrical systems, it's best to take your vehicle to a qualified mechanic. Incorrectly diagnosing and replacing fuses can lead to further damage.