Here's a breakdown of possibilities and how to approach them:
* Check Engine Light (CEL) is on: The CEL indicates a fault code stored in the PCM. You need to retrieve these codes. You'll likely need a code reader (OBD-I reader, specific to your vehicle's year) to read the diagnostic trouble codes (DTCs). Once you have the codes, you can look them up (online resources or repair manuals are helpful) to determine the issue. Fixing the underlying problem is crucial, not just clearing the codes. Clearing codes without fixing the problem will simply cause them to reappear.
* Performance issues (stalling, rough idle, etc.): These could be due to many things, not necessarily a "computer problem." Start with the basics:
* Check and replace worn-out parts: Spark plugs, wires, distributor cap and rotor, air filter, fuel filter are common culprits.
* Battery/alternator: A weak battery or failing alternator can cause erratic performance.
* Throttle body: Could be dirty or require cleaning.
* Mass airflow sensor (MAF sensor): A dirty or failing MAF sensor can significantly impact performance.
* You're thinking of resetting the radio: The radio's code is separate from the engine computer. If you're trying to reset the radio code, consult your owner's manual or the radio itself – it usually involves a specific button sequence.
In short, there's no simple "reset" button for the 1992 Dakota's engine computer. Diagnosing and fixing underlying mechanical or electrical issues is the correct approach. If you suspect a problem with the PCM itself, you'll need a mechanic or specialized diagnostic equipment to determine if it needs replacement or repair. Simply disconnecting the battery for a short period (e.g., 30 minutes) *might* clear some codes, but is not a guaranteed solution and won't fix any underlying problems.
