Symptoms and what role does tuby.me

1. What is a map sensor?

The absolute pressure sensor (MAP) is used by the ECU control unit to calculate the engine load. This sensor generates a signal proportional to the void in the suction gallery. ECU uses this item, together with some others, to calculate the correct quantity of fuel to be injected into the cylinders.

When the engine operates in pregnancy, the void in the intake decreases as the acceleration opens. The engine attracts more air, which requires more fuel to maintain the optimal ratio to the air fuel.

When the ECU reads the high load signal on the map, it causes the fuel mixture to be a little richer than usual, so the engine produces more power. At the same time, ECU slightly changes the synchronization of the ignition (pad) to prevent the blow, which can damage the engine and reduce performance.

When the vehicle is below light load, lower or slow down, a lower power is required. The accelerator valve is slightly open, or it can be closed, which increases the void. The MAP sensor detects this. ECU runs out the fuel mixture and changes the ignition time to reduce fuel consumption.

2. Where is it?

This absolute pressure sensor can be in different points, depending on the brand and the car model. The MAP sensor can be mounted on the engine panel, on the internal wing or on the suction tunnel. It is directly connected, through a hole in the collector or using a tube. In Turbo engines, this sensor is often installed directly on the suction gallery.

3. What role does the map sensor have?

The MAP sensors are called the collector’s absolute pressure sensors and not vacuum suction sensors, since they measure the pressure inside the intake manifold. When the engine does not work, the pressure inside the suction tunnel is the same as the external atmospheric pressure. When the engine is started, a void is created inside the tunnel, due to the movement of the pistons and the restriction created by the accelerator valve. When the acceleration flap is completely open with the engine on, the vacuum of suction decreases to zero and the pressure inside the suction tunnel is again almost the same as the atmospheric pressure from the outside.

When the acceleration flap opens suddenly, as if I accelerated, the engine attracts a large amount of air and the emptiness drops to zero. So the void grows slowly when the acceleration flap is closed. When the contact button rotated for the first time, before starting the engine, the control unit checks the reading of the map to determine the atmospheric pressure (barometric). Therefore, the MAP sensor can work as a atmospheric pressure sensor (Baro). ECU therefore uses this information to adjust the air/fuel mixture, to compensate for changes in air pressure due to altitude and/or time.

There are some types of cars that use a separate barometric sensor for this purpose, while others use a combined one, which measures both pressure and is called BMAP.

In engines with excessive food, the situation is more complicated, because when it is supercharged, there may be a positive pressure of the suction gallery, but the MAP sensor does not matter, because it monitors absolute pressure within the suction gallery.

In electronic injection engines, the air flow is estimated, not measured by the air flow sensor. The controller analyzes the map signal, as well as the engine speed, the position of the acceleration flap, the cooling liquid temperature and the room temperature, to estimate the amount of air that enters the engine.

4. Deleity map sensor: the most common symptoms

The defective map sensor has serious fuel control implications, exhaust gas emissions and fuel savings.

The most common symptoms are:

• High fuel consumption: the device sends data to the control unit on high air pressure, which is actually much lower, due to the cylinders the mixture is richer
• The engine dynamics decreases and does not improve with heating
• When the engine is on, it has a smell of fuel from the drain tube
• In operation, it emits white smoke, even in the hot season
• There are tangible interruptions in the operation of the engine
• A message on the ON -BOARAR computer is displayed
• The engine works defective to the ranks
• Car smoothies feel when they change speeds
• Operation of the unstable engine in every way to walk, the presence of strange unknown sounds, often in the form of a hum
• Ceso Noxis

5. What are the most common causes of the defecation of the MAP sensor?

The MAP sensor is a fairly reliable device, but sometimes it does not work, causing the motor passage in an emergency mode and even preventing the engine.

The most common causes of failure of the map sensor are:

• Poor connection between the sensor and the aspiration connection
• Short circuit in the sensor circuit
• The coconut tube, insufficiently flexible
• Defect of the air temperature sensor, which is associated with the map and sometimes combined with it in the same housing
• Depressurious void tube due to damage or disconnection from the sensor
• Break the «mass» contact
• Oxidation of contacts, which makes a tangible correction of the measurement value
• By clogging the sensitive element of the sensor – together with the aspirated air, the dust particles can circulate through the system and are deposited in the area of ​​the thermistor
• Mechanical damage to the box or other auxiliary elements that influence the accuracy of the measurements
• Clogged and low system permeability filter

6. What do you do when the symptoms of a defective or dirty map sensor appear?

In general, the air flow sensor is important to obtain maximum power of the engine, for complete combustion (ecological) and for an economic guide. The defect of this sensor leads to the activation of the warning light bulb of the control engine, which can turn on for any reason. If there is no diagnostic computer in the car, you will have to go to a service station where there is a scanner.

7. How is a dirty map sensor at home clean?

The following steps are traveled:

1. With a knife or a sharp tool, remove the lid of the device and identify the place of the defect
2. Clean the contacts of dirt and rust, check the reliability of the connections
3. After cleaning, they are dried, filled with silicone and again dried
4. After the device has been reassembled, all joints are sealing with a sealing material
5. The device is installed on the car and its functionality is verified. If the start of the engine is fast and works without hitches, it means that the device works correctly and cleaning has been performed correctly
6. If, on the contrary, cleaning has not given the expected results, the sensor is replaced with a new one.

8. When you need to go to an automotive service

In the event that the car presented the symptoms mentioned above and the dashboard does not provide you with sufficient data or you may not have enough mechanics, the best thing is to resort to an automotive service.

9. Tips to avoid the defect At the entrance of the air pressure sensor

The map pressure sensor does not have the slightest life of life, but many drivers have faced the need to replace it after several years of operation of the car. It is quite difficult to identify its failure without the help of a specialist; The defects may indicate both the defect of the mass flow or air temperature sensors and the engine defects, they can hardly be called maintenance. The simplest method of resuscitation of the sensor is to clean the contacts. The tips of the specialists refer to the care and cleaning of the entire motor system.