How do you test a 5 wire MAF sensor?
How do you test a 5 pin MAF sensor? Disconnect the 5-pin harness connector at the Mass Air Flow (MAF) Sensor. Start the engine and let it run at idle. Measure the voltage between terminal 3 of connector and the engine ground (GND) using a multimeter and the adapter cables from the connector test kit.
Can a car run without a MAF sensor?
While the vehicle may run with a dirty or broken MAF, it will not be efficient and may cause mechanical damage to the engine due to running in a lean condition. A failed MAF sensor may not send any airflow information to the PCM. By disconnecting the sensor the ECU switches to limp mode and the car may idle better .
What does the MAF sensor on a VW Jetta do?
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. If you do determine that you need a new mass airflow sensor, they aren’t too expensive.
How to test the 5 wire mass air flow sensor?
The most common way to test the 5 wire VW Mass Air Flow (MAF) sensor is just to unplug it with the engine running. If the MAF is bad (either because it’s not producing a signal or producing an erratic one), the car’s idle will return to normal and the car will seem to run fine.
What kind of air flow sensor does a VW use?
Before I go on, let me tell you that VW uses several types of mass air flow sensors (also known as Air Flow Meters), for the most part they can be divided into two categories. One type has a connector with 4 slots for only 4 male spade terminals and the other has 5 slots for 5 or 4 male spade terminals.
Why does my VW not set a MAF code?
The car will not idle or idle rough. Black smoke coming from the tail-pipe. A tremendous lack of power upon acceleration. In other words, you can start the car, but when you press the accelerator pedal, the car just won’t move. A MAF sensor code. But not always. I have replaced fried MAF sensors on different VW’s that never set a MAF code.