How To Test A Map Sensor

First set your multimeter to about 100 or 200 hertz. Here is a video on how a mass air flow and a manifold absolute pressure sensor work and also how you can test them using a basic multimeter. Unplug the electrical connector from the map sensor and turn the ignition key on but do not start the engine.
how to test a map sensor

Connect the voltmeter to the map sensor by connecting the black lead to a good ground and connecting the red lead to the center of the three wires in the map sensors electrical connector.

How to test a map sensor. Unplug the vacuum hose form the sensor and plug in a hand held vacuum pump to the sensors vacuum port. Step 2 turn the ignition key on with the engine off. Its with a multimeter. Testing a digital map sensor if your vehicle uses a digital map sensor instead of an analog one you can also test it using a dmm that can measure frequency signals.

The voltage displayed on the voltmeter should be between 45 to 5 volts. To be a bit more specific the multimeter is connected to the map sensors signal wire and vacuum is manually applied to it with a vacuum pump or with the mouth. Please consider supporting this channel. Map sensor test 1.

Testing the map sensor voltage signal the most accurate way to test the map sensor isnt with a scan tool. With a voltmeter measure the reference voltage by touching the reference wire with the meters positive lead and the negative lead to ground black wire which is at the connectors end coming from the computer. Checking the map signal with a multimeter the very first thing that youll do to get this show on the road is to test the map voltage signal that the map sensor creates. Youll do this with a multimeter in volts dc mode and with the engine off.