Atmospheric Pressure Sensor: Testing
- Remove vacuum hose on sensor. Turn ignition on and check voltage between terminal "A" and ground, and "B" and ground. Observe voltmeter while applying and releasing vacuum.
- Voltage at terminal "B" should be about 4.5-5.5 volts. Voltage at terminal "A" should be less than 1.5 volts. If voltage at terminals "A" or "B" is not correct, check wiring harness. If voltage fluctuates, replace atmospheric pressure sensor.
- Measure voltage between terminal "D" and ground. Depending on altitude, voltage at terminal "D" should be 3.5-4.5 volts at sea level and 2.5-3.5 volts at 6500 feet. If voltage at terminal "D" is incorrect, replace atmospheric pressure sensor. See Fig 1
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Courtesy of MAZDA MOTORS CORP.