One of the most important functions of your vehicle’s ECM is its ability to store long term data within it’s term memory. As you drive, the engine computers are continuously working to learn about the way you drive your vehicle and will adjust the way other modules perform. Which enables your vehicle to run as efficiently as possible. Because your ECU learns about your driving habit constantly since it has the capacity to store tons of data including your trouble codes which is extremely useful information when diagnosing possible faults within your vehicle. Analyzing this personal data and learning how to reset your ECM are both essential during this diagnostic phase.
If your check engine light comes on then chances are there may be an internal electrical issue within your vehicle that must be addressed. Before replacing any parts you want to reset your ECM to ensure that part replacements are absolutely necessary. There are a few ways to reset your control modules. One way is by disconnecting the battery cable for 2 to 3 minutes and waiting to see if the check engine light comes back on upon reconnecting the battery and start the car. Drive the car for at least 10 miles for the ecu to learn, if there is a problem with your vehicle then the check engine light will come back on and you can analyze the fault code that the ECM throws. These codes will guide you towards the root of the problem and you can begin replacing parts to try to fix the issue. Upon installation of the new parts you want to continue to reset your computer so that the engine control can “learn” the new parts and store this new data. PS ( make sure you do not have any battery cable issues and have a backup power handy before you reset the ecu).
Resetting your Engine Control Module through the Fuse Box
Resetting your cars ecu can also be useful when modifications are done on the vehicle. In this instance, you want to reset your engine control modules manually through the fuse box. The fuse box is located on the passenger side next to the battery. When your vehicle has properly warmed up then you want to turn your vehicle back off and unplug both fuses, cut power by disconnecting the battery . After a few minutes all the old data should be reset so plug the fuses back in and turn your vehicle back on. You will want to leave your vehicle at idle for at least 10 minutes which will give your ECM enough time to “learn” any new modifications installed on your vehicle. Because the auto ECU is such a sensitive module, it is very important to reset the unit after modifications are installed or else the new modifications may conflict with the way the engine performed previously.
Resetting your cars ecu, should not be a hassle at all as there are many more ways to reset your ECU and there are many more reasons for doing so. Resetting your car computer will do no harm to your vehicle and should always be done when any replacements are installed like a fuel filter, knock sensor even you when after work on your car air conditioning or any diagnostics are performed . Do not hesitate to check your repair manuals or the owners manual if you want to replace your vehicle ECM.
The 2 most common ways to reset your car computer is by either unplugging the battery or by resetting the fuse related to the engine control module
Disconnect the battery and Switch the ignition key to the on position for about 15 minutes should reset the ECU
Yes, all ECU (Engine Control units) can be reset and be should reset once per manufacturer’s guideline for a smooth relearn process or upon installing a replacement unit.
You can either reset your FORD PCM through the fuse box or the simple yet effective way that is to just unplug the battery.