The ECM, or electronic control module, is the computer responsible for controlling all of the engine management functions. It is the central control unit of most vehicles and controls a variety of functions, such as electrical system power distribution, emissions, ignition, and fuel systems. It is a very important, if not the most important component of a modern engine management system, and just the same as any other important electrical component it is powered through a relay.
The ECM power relay is the relay responsible for sending power to the ECM. If the relay fails, or has any issues, it can cause the vehicle to have all sorts of problems, and may even render it undriveable. Usually a problem with the ECM power relay will produce a few symptoms that can alert the driver of a problem that should be serviced.
![]() ![]() 1. No power when the key is inserted
One of the first symptoms of a problem with the ECM power relay is no power when the key is inserted. If the ECM power relay fails it can cut off power to the entire vehicle. A failed relay will disable the dash lights and warning chimes that normally come on when the key is inserted into the ignition, and will probably be unable to start or turn over the vehicle.
2. Engine will not start
Another common symptom of a problem with the ECM power relay is an engine that will not start or turn over. The fuel and ignition systems, as well as several other engine management functions, of many vehicles are controlled by the ECM. If the ECM or it’s relay fail, the entire engine management system will be left without power and will not function as a result. A bad relay may cause the vehicle to crank, but not start, or sometimes not even crank at all.
3. Battery drain or dead battery
A failed ECM power relay can also cause a battery drain or dead battery. If the relay shorts it can leave power on to the computer, even when the vehicle is turned off. This will place a parasitic drain on the battery, which will eventually cause it to go dead.
The ECM power relay is one of the most important relays as it provides power for the vehicle’s computer system. Without it the entire engine management system will be disabled and the vehicle will not run. For this reason, if you suspect that your ECM power relay may be having an issue, have the vehicle inspected by a professional technician, such as one from YourMechanic, to determine if the relay should be replaced.
The statements expressed above are only for informational purposes and should be independently verified. Please see ourterms of servicefor more details
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What Are The Symptoms Of A Bad Engine Control Module Located
A bad car thermostat can be difficult on your wallet because it can ruin the car’s engine if you’re not careful. This is a critical component that, when faulty, must be repaired immediately. Read on to know more about the symptoms or warning signs of a bad car thermostat.
1. Overheating
A bad thermostat can cause the car to swelter, as the thermostat is a heat-sensitive control device situated at the radiator hose. When the temperature of the engine reaches its normal operating temperature, this device should open to allow coolant to flow into the engine to regulate the heat. If the thermostat is stuck closed, antifreeze won’t flow from the radiator, resulting in the car overheating. Thus, if this happens, one of the possible causes is a broken thermostat.
This problem can definitely be attributed to other issues with the cooling system, such as leaking hoses, but checking for a bad thermostat should be on your list as well since this is a fairly cheap, easy fix.
2. Under Heating
If the thermostat is trapped in an open setting, it leads to engine under heating. The open setting means that coolant will be constantly moving into the engine, regardless of whether it is hot enough to need it. Instead of ending up too hot all the time, the engine will then have an issue with being too cool.
If you have been driving for a few minutes and your vehicle’s temperature gauge needle is still sitting close to the bottom, it’s time to check your thermostat.
3. Temperature Fluctuations
A malfunctioning thermostat will result in odd temperature fluctuations throughout the operation of the engine. In this case, the thermostat won’t be stuck in any one position, but there will still be false readings causing problems with regulation. The engine temperature will change erratically while the radiator coolant is prohibited from flowing normally.
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4. Poor Engine Performance
If the engine’s operating temperature is all over the place while trying to function, engine performance will ultimately suffer. This could lead reduced gas mileage and, eventually, damage that will cost a bundle to fix.
If you notice any of these issues, don’t hesitate to pop open your hood and check out your car’s thermostat. A new thermostat can be purchased at your local auto parts store and the repair is an easy one that can be done yourself if you’re looking to save some money.
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