Manifold Pressure/Vacuum Sensor: Testing and Inspection

Vacuum Sensor Circuit Diagram:

Circuit Diagram

Vacuum Sensor Inspection:

Inspect Power Source Voltage Of Vacuum Sensor
- Disconnect the vacuum sensor connector. Turn the ignition switch ON.
- Using a voltmeter; measure the voltage between terminals VCC and E2 of the vacuum sensor connector.

Voltage: 4-6 V

- Reconnect the vacuum sensor connector.

Vacuum Sensor Inspection:

Inspect Power Output Of Vacuum Sensor
- Turn the ignition switch on.
- Disconnect the vacuum hose on the air intake chamber side.
- Connect a voltmeter to terminals PIM and E2 of the ECM, and measure the output voltage under ambient atmospheric pressure.
- Apply vacuum to the vacuum sensor in 13.3 kPa (1OO mmHg. 3.94 in.Hg) segments to 66.7 kPa (5OO mmHg, 19.69 in.Hg).
- Measure the voltage drop from above for each segment.

Vacuum Sensor Voltage Readings:

Voltage drop chart