Today we will give you complete information about the symptoms of bad map sensor, which you can easily identify the symptoms after the problem in this sensor.
The map sensor installed in the engine is very important and it is installed in the intake manifold, in some cars this sensor is installed in the intercooler.
Many mechanics ignore this sensor, due to which many problems arise in the car, so today we will first talk about its function and then give information about its symptoms.
working of map sensor petrol and diesel
We also call map sensor as manifold absolute pressure sensor as soon as the car starts, according to the air that enters the engine, the map sensor generates a signal and sends the signal to the ecm and through that signal the fuel is supplied to the cylinder through the ecm injector.
There is a diaphragm in the map sensor for this signal. As soon as we start the car, less air enters the intake manifold through the throttle body and the diaphragm of the map sensor is down.
As soon as we accelerate the car, more air enters the inatke manifold and the pressure of the air becomes very high, according to that pressure, the diaphragm of the map sensor moves upwards.
A piezo resistive is placed above the diaphragm, after the air pressure is created in the intake manifold, there is a change in the diaphragm and because of that, there is a change in the piezo resistive and it moves upwards.
Due to which the map sensor creates high voltage and sends this voltage to the map sensor ecm, according to this voltage ecm finds out how much air pressure is there and supplies fuel to the cylinder accordingly.
But sometimes there is a problem with the map sensor and it does not create voltage, which ecm does not know about the pressure of air, which ecm supplies fuel in excess.
symptoms of bad map sensor petrol and diesel
After the map sensor is damaged, you can see many different symptoms in your car, about which complete information is given below.
(1) . check engine light is on
After the map sensor goes bad, the check engine warning light turns on in the dashboard and this is the first symptom of the map sensor. There can be many different problems in the map sensor.
Like map sensor getting damaged, map sensor wire breaking, map sensor connector coming out etc. In all these problems the check engine light turns on and gives us a signal to get the car scanned.
(2) . drop mileage
After a problem with the map sensor, you will see less mileage in your car because if the map sensor does not work properly, then diesel car or petrol mileage decreases.
When the map sensor stops generating voltage, its connection with the ecm is broken, which ecm does not know the correct preassure of the intake manifold, so there is no problem in the car, so the ecm increases the supply of fuel and the mileage decreases.
(3) . low pickup
Generally, we have seen that after the problem in the map sensor, the pickup of the car is less than before, after some time of pressing the accelerator pedal, the car catches the pickup.
This can also happen due to the dust accumulated in the map sensor, it is important to pay attention to it, for this you can open the map sensor and clean it.
(4) . starting hard problem
In most of the cars, we have seen ourselves that starting becomes very hard as soon as there is a problem with the map sensor and this is its main symptom which needs to be taken care of.
This happens due to lack of proper combustion in the cylinder, when the signal of map sensor and ecm is broken then ecm supplies more fuel but air goes according to its quantity.
Due to which the blast in the cylinder is not correct due to the amount of fuel and air not being correct, due to which the car does not start, hard starting is done.
(5) . rough idling
When there is a problem related to the map sensor in your car, then you will see the problem of rough idling in your car, which can be felt more.
While driving the car, you can see the rpm going up and down, many times the rpm goes below 1 and the accelerator pedal has to be kept pressed, the engine shakes, vibration is felt.
(6) . misfiring problem
When there is a problem with the map sensor in your car, then there is a problem of misfiring and you will be able to see this symptom easily and most of the reason is plug.
When the map sensor fails, it does not give any signal to the ecm, at that time the ecm does not detect the pressure of the manifold, and the ecm supplies more or less fuel to the injectors.
More fuel goes into the cylinder and less air due to which the fuel does not burn properly due to which misfiring occurs in the cylinder.
(7) . low engine power
The engine needs the right amount of fuel and air to function properly and after a problem with the map sensor, there is a problem with the amount of fuel.
Due to which the mixture of fuel and air gets spoiled, the fuel does not burn properly in the cylinder, misfiring occurs, due to which the power of the engine decreases.
(8) . exhaust smoke
After a problem with the map sensor, you may get to see exhaust smoke in your car, which you can find out whether the map sensor has a problem or not.
When the fuel and air inside the engine do not burn properly, it comes out of the exhaust in the form of smoke and this happens after the problem in the map sensor.
If there is a problem with the map sensor for any reason, then you will see all the symptoms mentioned above in your car along with a fault code.
how to fix map sensor problem
If there is a problem related to the map sensor in your car or the fault code appears, then you can easily fix this problem by doing the work mentioned below.
(1) . clean map sensor
(2) . check map sensor wire and connector
(3) . check map sensor signal
(4) . check intake manifold leakage
(5) . change map sensor
Whenever you see the code related to map sensor, then do the work mentioned above.
Hope that you have got complete information about the symptoms of bad map sensor petrol and diesel through our article and now you will not have any other problem related to it, if you have any problem, then comment, we will help you completely. We try our best to provide you correct information
Know the answers to some questions
Q . What causes the problem related to map sensor?
ans . When too much dust accumulates in the map sensor, the map sensor stops working properly due to which the problem arises.
Q . Can the car be driven when the map sensor is faulty?
ans . You should not drive the car when the map sensor is damaged because it will cause more damage to you and the biggest disadvantage is the very low mileage.
Q . Can the map sensor be cleaned on every service?
ans . You can get the map sensor cleaned at every service, it will not be a problem related to mileage in your car.
Q . What is the main function of map sensor?
ans . The main function of the map sensor is to inform the ecm about the pressure of the air being created in the intake manifold.