Manifold Pressure/Vacuum Sensor: Testing and Inspection

Inspection
1. Warm up the engine to normal operating temperature and run it at idle.
2. Turn all electrical loads off.




3. Connect a voltmeter between the manifold absolute pressure sensor terminal A and B and verify that the voltage is within specification.

Voltage: 1.3-1.6Volts




4. Disconnect vacuum tube and plug the vacuum tube and verify that the voltage is within specification.

Voltage: 2.38-2.78Volts

5. Connect a vacuum pump to the manifold absolute pressure sensor.
6. Apply vacuum and measure the voltage of the manifold absolute pressure sensor.




7. If not as specified, replace the manifold absolute pressure sensor.
8. Cancel the memory of malfunctions by disconnecting the negative battery cable for at least 20 seconds and depress brake pedal.
9. Reconnect the negative battery cable.