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Nissan Terrano High emissions problem. MAF sensor? YouTube . Smoke plumes shown on the map indicate that smoke is present. In the voltage drop test, the voltmeter leads are placed in parallel with the circuit being tested. from venturebeat.com In a study of mice, the researchers showed that their sensors could accurately distinguish bacterial and viral pneumonia within two hours, using a simple urine test to read the results. With your handy multimeter, you can easily take a few readings that will tell you if your sensor is functioning. Position the pump so you can easily see the pressure gauge and access the hand pump.