Permanent pressure sensor (ManifoldabsolutePressuresensor), referred to as MAP.It connects the intake manifold with a vacuum tube. With the different speed load of the engine, the vacuum changes in the air intake manifold are sensing, and the change from the internal resistance of the perceptual to the voltage signal for the ECM computer to correct the amount of fuel injection and ignition the positive ignition positive.Time angle.
Inlet pressure sensor cleaning
1. Disassembly on the engine on the engine; 2. Disassemble the intake pipe between the engine and the empty filter (this is more difficult to disassemble, especially in winter, it is recommended to disassemble the hot car in the future);Wipe one side of the throttle and open the door, then open the electric door, dont ignite, let a person help you step on the accelerator (no one will find a few more red bricks to press the throttle) At this time, you will see the throttle open. NowStart with a wet scarf cleaning the edge of the lower mouth of the foul door and the throttle. In the whole process, if the stubborn clay tip is sprayed on the wet towel with a very stubborn clay tip.4. Dont rush to throw the throttle. You can see that there is an oily substance in the trachea below through the throttle, and wipe the mud below with a long tweeter with a wet scarf.At this time, the throttle part has been cleaned up, and the throttle can be lost. The key must be pulled down! 5. Dont rush to put it back, and there is a sensor to clean it. This is called the intake pressure sensor.Sensor, if the car starts to increase fuel consumption, or the reaction of the throttle is not sensitive, most of them are because of the failure of this sensor. The sensor of washing the throttle is not washed.
Inlet pressure sensor detection
1. Failure.The engine is trembling, the acceleration is weak, and the exhaust pipe is fascinated by black smoke. The initial diagnosis of the signs mentioned from the fault is too mixed.2. Analysis of fault diagnosis and cause.Open the ignition switch at the "IG" position, and the flickering code "Figure" 3.1 yard of the flicker fault light, indicating that the air intake pressure sensor failure.Possible reasons; ECU faults, wire beams or short circuits, air intake pressure vacuum pipes fall off, air intake pressure sensor failure 3. Check the air intake pressure vacuum pipe.Check whether the vacuum tube is ruptured, falling off, aging, etc.4. Detect ECU.Unplug the wire stress sensor wiring connector, and the ignition switch is placed in the "IG" position. The multimeter is placed in the "20V" position to detect the ECU terminal VC and E2. The voltage should be 5V. The ECU terminal PIM and E2 should be detected.The voltage should be 5V, if no voltage indicates the internal failure of the ECU.
Principles of intake pressure sensor working principles
1. The intake pressure sensor detects the absolute pressure of the air intake manifold behind the festival and the back of the valve. It detects changes in absolute pressure in the manifold according to the size of the engine speed and the load, and then converted to the signal voltage to send it to the engine control unit (ECU), the size of the ECU controls the basic fuel injection according to the size of this signal voltage.Missing resistance type, capacitive type 2. There are many types of intake pressure sensors, including voltage -sensitive resistance type, capacitance, etc.Because the pressure -sensitive resistance has the advantages of fast response time, high detection accuracy, small size and flexible installation, it is widely used in D -type jet system.
Inlet pressure sensor failure
1. Internal circuit or short circuit of the sensors internal line; 2. The sensor output signal cannot change with the change of the vacuum of the trachea; 3. The voltage of the sensor output signal is too large or too small, and the value is deviated from the constant range;The connection line breaks or short circuit of the sensor and the computer, the vacuum hose between the sensor and the air intake pipe is blocked or the air leakage, and the intake pipe vacuum holes will also make the output signal of the sensor abnormal.
The role of intake pressure sensor
The intake pressure sensor detects the absolute pressure of the intake manifold behind the festival and the valve. It detects changes in absolute pressure in the manifold according to the size of the engine speed and the size of the load, and then converted to the signal voltage to the electronic controller (ECU) (ECU) (ECU)Based on the size of this signal voltage, the ECU controls the amount of basic fuel injection.There are many types of intake pressure sensors, including pressure -sensitive resistance, capacitance, etc.Because the pressure -sensitive resistance has the advantages of fast response time, high detection accuracy, small size and flexible installation, it is widely used in D -type jet system.

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