1/15/2024 0 Comments Bad mass air flow sensor![]() ![]() The airflow sensor signal circuit is built into the mass air flow sensor to calculate the amount of current flowing through the sensor, convert this current into voltage, and transmit it to the vehicle’s ECU via the air flow sensor or MAF signal cable. MAF ground wire is used as a common ground connection for both vehicle’s ECU and sensor. This wire transfers the signal of the sensor (output voltage) to the ECU. ![]() The mass air flow signal wire is connected to the vehicle’s ECU. There are 4 wires in this wiring diagram, which are 12V positive power supply, MAF ground, IAT (Intake Air temperature signal) signal, and MAF signal.Ī positive power supply of 12V or called hot-wire is connected to a relay and a fuse in the fuse box. The 4-wire air flow sensor wiring diagram is shown below and explained in this section. (MAF ground, MAF signal, MAF power, air temperature signal, air temperature reference voltage). 5-wire mass air flow sensor wiring diagram.4-pin/4-pin mass air flow sensor wiring diagram (positive power supply 12V, MAF ground, IAT signal, MAF signal). ![]() 3-wire mass air flow sensor wiring diagram (hot wire-reference voltage from ECU, ground wire, signal wire).There are 4 forms of air flow sensor wiring diagrams. The mass air flow sensor or air flow sensor wiring diagram is designed by the manufacturer according to the year, model, construction, type, and demand. The electronic control circuit/ECM measures the flowing current simultaneously and outputs a voltage signal proportional to the flowing current. As airflow increases, heat dissipates faster from the heating wire, and the electronic control circuit or ECM compensates by passing more current through the hot wire. An electronic control circuit connected to the thermistor helps to maintain a constant temperature in the heating wire (hot wire). Thermistors measure the incoming air temperature. If this information is inappropriate or without this information, the ECU can’t control fuel injection accurately, and the engine will not run. The PCM/ECM then utilizes data information to monitor and calculate the exact amount of fuel required for the optimum air-fuel ratio. Despite the many names, the main task is to measure the amount of air entering the engine. The Mass Air Flow Sensor is simply called a MAF Sensor or air flow sensor, or air meter. This article gives a brief description of the working of an airflow sensor or mass air flow sensor. This sensor is necessary to determine the amount of fuel injection, when to fire the cylinders, shifting of gears, and calculate the exact air-fuel ratio/flow rate. Air Flow Sensor or Mass Air Flow (MAF) sensor is one detection device, which can convert the amount of air entering the vehicle’s engine into a voltage signal to calculate the load of the engine. In automobiles, there are various sensors to control all engine functions and work to indicate failures and protect the vehicles from damage. ![]()
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