Instead of resetting the light, you need to diagnose the problem that's causing it. Here's how:
1. Get the diagnostic trouble codes (DTCs): This is crucial. A 1992 Comanche uses an OBD I system, which means you'll need a method to read the codes stored in the computer. There are a few ways:
* Use a code reader: These are specifically designed for OBD I vehicles. You'll need one that's compatible with your Comanche's year and system. Auto parts stores may have some older readers, or you might find one online.
* Jump wire method: This involves connecting two specific wires under the dashboard (usually the ALDL connector), turning the ignition on and off in a specific sequence, and counting blinks of the CEL to determine the code. This method is more cumbersome and requires a detailed wiring diagram and the knowledge of how to correctly interpret the blinks. Be very cautious when working with car wiring. Incorrect connections can damage the vehicle's computer. Search for "1992 Jeep Comanche OBD1 diagnostic jumper wire method" to find specific instructions for your vehicle if you choose this method. This is NOT recommended for anyone unfamiliar with vehicle electrical systems.
* Professional Mechanic: The easiest and safest option is to take your Comanche to a mechanic who has experience with older OBD I vehicles. They will have the equipment to read the codes and diagnose the problem.
2. Interpret the DTCs: Once you have the codes, consult a repair manual specific to your 1992 Jeep Comanche. The manual will provide a list of DTCs and their corresponding problems.
3. Repair the problem: Once you know what's causing the CEL, fix it! This might involve replacing a sensor, fixing a wiring issue, or performing other repairs.
4. Clear the code (after repair): *After* successfully repairing the issue, the CEL should turn off automatically after a few driving cycles (the car's computer monitors the issue for a short time to confirm the repair). If the light remains on after the repair, there may still be a problem or you might need to clear the code with a code reader or a professional mechanic. Simply disconnecting the battery for a short period, while sometimes clearing the code, is unreliable for OBD I systems and may not be sufficient.
Do not attempt to reset the CEL before diagnosing and repairing the underlying problem. Ignoring the check engine light could lead to more serious (and expensive) damage to your vehicle.
