Where is the Passat air flow meter located | SILVER,transit time ultrasonic flow meter

『Where is the Passat air flow meter located』Related information(flow rotameter|digital flow meter|balo meter|hydraulic flow meter|volumetric meter|positive displacement meter|pitot tube flow meter|displacement meter|cfm meter|variable area flow meter|inline flow meter|differential pressure flow meter|calibrated flow meter|velocity meter|paddle wheel flow meter|oval gear flow meter|anemometer hvac|multiphase flow meter|doppler flow meter|thorpe tube flowmeter|heat flow meter)

1. What is the problem with the Passat B5s weak acceleration when unplugging the air flow meter?

1. Introduction to the function of the air flow meter. The air flow meter measures the amount of fresh air entering the engine intake manifold and the intake temperature., ECU performs fuel injection quantity correction, smoke restriction, and EGR opening control based on this information

2. Installation position: The sensor is installed on the engine intake pipe, at the rear end of the air filter. 3. Working principle: 3.1. Principle of air flow meter: The air flow sensor integrates some electronic components on a ceramic substrate. When the engine is working normally, it first heats the diaphragm, and when fresh air flows through the sensor, it takes away some of the heat. At this time, the ECU will control the Wheatstone bridge on the diaphragm to supplement the heat of the diaphragm, which will cause changes in the electrical signal. When the signal is transmitted to the ECU, The ECU will calculate the intake air volume based on this change. 3.2. The principle of the air temperature sensor. The intake air temperature sensor is a resistor with a negative temperature coefficient. When the intake air temperature changes, the resistance value of the resistor will change, which will cause a change in the signal voltage at the ECU end. The ECU calculates the intake air temperature based on this change. 3.3. Determination of airflow direction: There are two temperature resistors at each end of the hot film of the air flow meter. When the airflow passes through the hot film, it will take away some heat, so the temperature at the front end of the hot film is lower than that at the rear end. The ECU det

Where is the Passat air flow meter located

ermines the direction of the airflow based on this signal! 4. Circuit diagram of air flow meter. 5. Control strategy: The ECU will constantly monitor the working condition of the air flow meter. When the ECU determines that the air flow meter has a fault, it will take corresponding control measures. The bending pin is as follows: 4.1. The engine MIL light will light up, the EGR system will stop working, and the exhaust gas will no longer participate in the system operation; 4.2. The engine speed will be limited to a certain speed, resulting in limited power; 4.3. When the air flow meter malfunctions, the engine can start normally without being affected;

2. Detection of air flow meter: Fault codes related to air flow meter

2. Passat B5 air flow meter disassembly method

Find the location of the air flow meter.

. According to a search on the Autohome website, the disassembly method for the Passat B5 air flow meter is to find the location of the air flow meter, use a wrench or screwdriver to remove the screws, take off the intake pipe, and unplug the large wire and vertical plug of the air flow meter. Shirt

3. Testing of Shanghai Passat Air Flow Meter

The Passat sedan uses a 5-valve ANQ engine, which is a new model newly developed by Volkswagen. It adopts many of the latest technologies in the world and can also be used in the Audi A6 sedan. The electronic fuel injection engine of Shanghai Passat sedan adopts a mass type hot wire air flow meter, which can accurately measure the intake air entering the engine for fuel injection and ignition control. Its installation position is shown in Figure 1. Testing of air flow meter 1. Testing instrument

(1) V.A.G1551 or leakage V.A.G1552; 『SILVER Official Website SERVICE』