How to Test the Air Flow Sensor on a '91 Stealth
The 1991 Dodge Stealth is equipped with a mass air flow sensor. The air flow sensor measures the air entering the engine. This information is used to maintain the proper air to fuel ratio within the engine at any given time. The sensor produces voltage when the engine is on which makes the sensor easy to test using a digital multimeter. The multimeter measures the output voltage of the sensor at idle and as the engien is working. This helps to determine if the sensor is working properly or is faulty.
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Instructions
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Park the Stealth and turn the engine off. If the car was recently driven, allow up to a half hour for the sensor to cool down. This will prevent possible accidental injruy.
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Open the hood and locate the air flow sensor. The Dodge sensor is found mounted between the air filter housing and the throttle body. The sensor is a small black box with a wire connection coming out from the side.
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Probe the sensor signal wire with a wire probe; the signal wire is labeled "B." Do not disconnect the wire harness; the sensor must remain plugged in to perform the test.
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Connect the digital multimeter positive lead to the wire probe. Connect the negative lead to the negative battery terminal. The positive lead wire is colored red and the negative lead wire is colored black.
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Set the digital multimeter to "Volts DC." Turn the engine on and allow it to warm up for one minute.
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Record the volts reading on the digital multimeter while the engine is at idle. This is your base reading. Ask a partner to push on the gas pedal to accelerate the engine. Monitor the multimeter voltage readings. The voltage numbers should jump up and then settle back down as the engine slows. If the voltage does not change the sensor is faulty and should be replaced.
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References
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