Method 1: Disconnecting the Battery
This is the simplest method and often works for clearing minor trouble codes.
1. Safety First: Turn off the vehicle and ensure the ignition is in the "OFF" position. Wait at least 30 seconds to allow the computer to fully power down.
2. Locate the Negative Battery Terminal: This is usually marked with a "-" symbol.
3. Disconnect the Negative Terminal: Use a wrench to loosen and remove the cable clamp from the negative terminal.
4. Wait: Wait for at least 10-15 minutes. Some suggest waiting longer (up to 30 minutes or even overnight) for a more thorough reset.
5. Reconnect the Negative Terminal: Carefully reattach the negative cable clamp to the negative terminal.
6. Start the Vehicle: Start the engine and let it run for a few minutes. The computer will relearn your driving habits over time.
Method 2: Using an OBD-II Scanner
This method is more precise and allows you to see the trouble codes before and after the reset. You'll need an OBD-II scanner (available at most auto parts stores).
1. Locate the OBD-II Port: This is usually found under the dashboard, often near the steering column.
2. Connect the Scanner: Plug the OBD-II scanner into the port.
3. Read Trouble Codes: The scanner will read any diagnostic trouble codes (DTCs) stored in the ECU. Write these down or take a picture.
4. Clear Trouble Codes: The scanner will have an option to clear the codes. Follow the scanner's instructions.
5. Verify Reset: After clearing the codes, check again to make sure they're gone.
6. Test Drive: Drive the vehicle for a while to allow the computer to relearn driving patterns.
Important Considerations:
* Check Engine Light: If the check engine light stays on after resetting, the problem that caused the code(s) hasn't been fixed. You'll need to diagnose and repair the underlying issue.
* Adaptive Learning: The ECU will relearn your driving habits over time. This means fuel economy and performance might not be optimal immediately after a reset.
* Persistent Problems: If you're experiencing ongoing issues, a simple reset might not be sufficient. Professional diagnosis and repair from a mechanic may be necessary.
Always refer to your owner's manual for specific instructions related to your 2002 Chrysler PT Cruiser. The locations of components and specific procedures might vary slightly.
