Manifold Absolute Pressure (Map) Sensor

1. Warm engine to operating temperature. Turn all accessories off. Connect positive lead of voltmeter to MAP sensor terminal "A" and negative lead to terminal "B".
2. With engine at idle, voltmeter should read 1.3-1.6 volts. Disconnect hose from MAP sensor and plug. See Fig 1 . Voltmeter should read 2.38-2.78 volts.
3. Connect a vacuum pump to MAP sensor, and apply 29 in. Hg. Voltmeter should read 4.35-4.65 volts. If voltmeter readings do not test as described, replace MAP sensor.

Fig 1: Testing MAP Sensor (RX7)

Courtesy of MAZDA MOTORS CORP.