How do you diagnose a bad MAF sensor?

Symptoms of a Faulty Mass Air Flow Sensor

1. The engine is very hard to start or turn over.
2. The engine stalls shortly after starting.
3. The engine hesitates or drags while under load or idle.
4. Hesitation and jerking during acceleration.
5. The engine hiccups.
6. Excessively rich or lean idling.

What is normal MAF reading?

Before replacing a Mass Airflow sensor, it’s a good idea to test it. Depending on the engine size, the MAF’s PID value should be between 2 to 7 grams/second and between 15 to 25 grams/s at 2500rpm.

How do you test a MAF sensor?

OK, you’re gonna’ start by checking the basics. These are 12 Volts and Battery ground to the MAF sensor. After that, we’ll test the actual performance of the MAF sensor as the engine is running. Use a digital multimeter for all tests where a multimeter is called for. The MAF sensor produces an analog voltage signal.

What does the a MAF sensor do on a VW Jetta?

A MAF sensor measures the density of the air entering the intake manifold. It passes this information onto your Jetta’s ECU. The ECU uses this information along with other sensor data to control the amount of fuel that enters the combustion chamber.

How do you remove the MAF sensor on a VW Audis?

Most VWs and Audis use pinch hose clamps, so use your pliers to squeeze the clamp open and slide off the inlet pipe. When putting the MAF back on, you can use a screw-type hose clamp to save yourself some hassle next time. Slide the wire harness off of the MAF Sensor.

What is the MAF on a TDI engine?

TDI engine TDI MAF/MAS (Mass air flow sensor) FAQ, for volkswagen TDI (diesel) 1996+ Introduction This article discusses the two types of MAF used on VW TDI and Audi TDI engines and what the car’s computer does with the information from the MAF. The mk3 uses a hot wire, the mk4, mk5, and mk6 VW and Audi use a thin film or hot film MAF.