Today’s vehicles rely on computers, engine control modules, or units (ECM/ECU) that monitor the sensors in the engine bay to enable the car to perform and function at its optimum.
The car computer is an essential component in your car and is often referred to as the car’s brain. It regulates several essential car functions to ensure the car runs efficiently. Some of the functions of the ECM include; checking the oxygen to fuel ratio, tracking idle speed, and controlling the variable valve timing and the ignition timing to increase power or fuel economy. If the engine control module or its related components encounters an issue, it can cause the vehicle’s functionality problems. In the worst-case scenario, this may be detrimental to your car’s functionality, making it unsafe to operate.
To avoid this risk and minimize the potential damage to your car, it is advisable to be on the lookout for the symptoms of a faulty ECM. To do this, you must be quite conversant with the symptoms of a failing system.
What are the symptoms of a failing car computer?
As we have highlighted, the car’s computer monitors several important functions in your car, and its failure could put you at significant risk. To curb this, you should always be alert while operating your vehicle and look for any tell-tale signs of your car’s ill health. The following are the main symptoms that could point to a failing car computer.
Difficulties while starting your car
A problematic car computer is likely to cause difficulties while stating the car. Sometimes, the car may even fail to start completely. This may be happening due to the failure of power reaching the car’s computer due to a blown a fuse or a wiring issue. However, if the entire module has failed, your vehicle will stall due to the lack of engine control.
An illuminated Check Engine Light
An illuminated check engine light may also serve as a warning sign for the driver. The check engine light turns on when the vehicle is switched on, but this is a simple test to ascertain that the bulb is functioning correctly. It is not supposed to light again unless the car’s computer has detected some trouble with the vehicle’s circuit or failed sensors. An illuminated check engine light should be an issue when the computer fails to record a problem with its components. Therefore, if you notice the light constantly staying on or being inconsistent, it is probably a good time to check your car for any issues.
Burning Smell
A burning smell in your vehicle is another symptom you should never ignore. The first rule is to inspect your ECM whenever you detect a burning smell or notice visible burn marks. Heat and overload can easily cause problems with the computer and the rest of your vehicle’s components.
Unstable Engine Behaviour
A damaged car computer can cause your engine to jerk, stall suddenly, or misfire provided your transmission is maintained, and your car has enough transmission fluid. This issue is unpredictable and varies in frequency and intensity.
Engine Issues
A malfunctioning car computer negatively affects vehicle performance, such as fuel settings. Your vehicle would experience decreased fuel economy, efficiency, and poor timing and acceleration.
What is the Solution for a Failed Car Computer?
When any of these issues arise, the car computer should report an error code that determines the source of the problem. Consult your trusted mechanic to read these error codes and to eliminate other potential causes of an illuminated check engine light.
Sometimes the check engine light may remain on even after configuring and repairing the car’s issues. In such a scenario, you must reset the car’s computer to erase the saved error codes.
Resetting your Faulty Car Computer
This step-by-step guide will come in handy should you reset your car computer without involving a mechanic or other professional. The reset should restore the ECM to its default settings and clear all car computer-related problems in your vehicles, such as computer codes or illuminated check engine lights.
You can use two methods for resetting your car’s computer. The first option is to turn off the car’s battery to break the circuit and erase all memory. On the other hand, you can go about the computer reset procedure with the car battery still on and attached to the car.
Resetting the Car Computer with the Battery Turned Off
For this procedure, you would need a battery wrench or pliers and a cable tie or insulating tape. You can also prepare a 10-watt resistor. Remember to turn off your car before commencing.
Using the battery wrench, remove the battery terminals and the battery from its compartment. This will effectively break the circuit, thus, preventing the flow of power into the engine.
Next, short the negative and positive wires of the engine, and tie them together using the cable tie or insulating tape.
Do the soft reset by leaving the wires short for about 45 minutes. This should drain the circuit of any residue current and cut the power from the car computer, thus clearing errors.
Clean the battery and its terminals using water and baking soda. Remove all rust, and rinse the battery after cleaning to clean off all the solutions.
After the 45-min wait, restore the battery and reconnect all the terminals.
Once everything is ready, switch the car back on and inspect the check engine light. The issue should be solved, and the error codes will no longer appear. Your check engine light will work properly, and you’ll be ready to go.
Resetting the Car Computer with the Battery Turned On
You can also reset your car computer without disconnecting your car battery. The rest of this article will explain how to go about the process. To begin, you will require a fuse puller and a code reader. You could also use a pair of pliers instead of the fuse pullers.
You will need to locate the vehicle’s fuse box to go about this process. Please search for a cover detailing the car’s various fuses and corresponding amperage. Once you have found it, you can follow the rest of our steps. legit-earner
Remove the cover, and using the fuse puller or pliers, pull the fuses labeled “Back-up” with 7.5A. Locate another fuse labeled “ECU” and pull it out with 15A. Note that you will not have to disconnect the negative battery terminals for this procedure. The problem with following the former process and disconnecting the battery terminals is that you erase your entire car’s memory. This solves the issue with the check engine light and resets all other information in your vehicle, including the critical data.
Let the fuses remain disconnected for about 10 minutes, then reinstall them properly alongside the ECU.
Restore the fuse box cover and test your vehicle. You can drive for a few minutes to check if the check engine light issue has been solved. If the light stops illuminating, you are good to go.
If the check engine light comes on, reduce your speed and load as you drive. If available, maximize the built-in diagnostic services that report trouble codes. This will allow you to schedule a service appointment with your automaker.
Conclusion
The steps we have explained in our guide: How to reset car computer, have been tested by various drivers and car experts. You can, therefore, follow them to solve issues with your car’s computer effectively. The high chances are that resetting the computer will solve whatever issue you may have and get you back safely on the road. However, in case of any doubt in the process, you’d better seek a professional from an expert. That way, you can be sure that your car’s issues will be correctly diagnosed and configured.
Pay attention to the warning signs from your computer. Do not opt to wait for the symptoms to subside automatically. This is because the vehicle could keep performing poorly and deteriorating into an unsafe state for you and others on the road. A faulty car computer would cause little to no problems regarding safety, time, money, and other resources if addressed early enough. Consider your options well, especially when resetting your car computer.