How to Test a Map Sensor

Written by alibaster smith
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The manifold absolute pressure sensor, or MAP sensor, monitors the amount of air flowing through the air intake system. When this sensor is malfunctioning or failing, you will experience excessive and frequent stalling. Your idling also may be extremely rough. When this happens, test your MAP sensor to confirm that this is the problem.

Skill level:
Moderate

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Things you need

  • Voltmeter

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Instructions

  1. 1

    Check the MAP sensor for any dust or debris on the sensor. To do this, flip the sensor upside down and visually inspect the sensor wires. Make sure that the sensor wires are free of any contaminants.

  2. 2

    Set the dial on the voltmeter to "Ohms" and check the resistance between the THA and E2 terminals (check your vehicle's service manuals for the exact location of these terminals on your MAP sensor). Insert one of the leads on the voltmeter into the THA terminal, and another lead into the E2 terminal. The output on the readout should be at or near 0.

  3. 3

    Turn the ignition switch to the "II" position.

  4. 4

    Set the dial on the voltmeter to "volts," and touch the red lead on the voltmeter to the VG terminal on the MAP sensor and black lead on the voltmeter to the E2G terminal on the MAP sensor.

  5. 5

    Gently blow into the sensor's wires and check the voltage. It should fluctuate. If it does, the MAP sensor is functioning properly. If it doesn't, your MAP sensor has failed and must be replaced.

Tips and warnings

  • For specific information about your vehicle's MAP sensor electrical terminals, consult the vehicle's manual (see Resources).

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