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Home >> Mazda >> 1991 >> RX7 2RTR-1308cc 1.3L MFI >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Manifold Pressure/Vacuum Sensor >> Testing and Inspection
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Manifold Pressure/Vacuum Sensor: Testing and Inspection

Pressure Sensor Testing:






1. Disconnect vacuum line at sensor and attach hand vacuum pump tester.
2. Connect voltmeter to sensor "D" terminal.
3. Apply 3.9 inHg (100 mmHg) vacuum to sensor.
4. Turn ignition switch "ON." Voltmeter should read 2.8 - 3.2V.
5. If not as specified, replace sensor.

Pressure sensor input voltage can be checked at ECU terminal 2H, ignition "ON." With vacuum hose disconnected and plugged, terminal voltage should be 3.4 - 3.6V. With 3.9 inHg (100 mmHg) vacuum applied to sensor, voltage should be 2.8 - 3.2V.
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