Manifold Pressure/Vacuum Sensor: Testing and Inspection

COMPONENTS

INSPECTION

1. INSPECT POWER SOURCE VOLTAGE OF MAP SENSOR
a. Disconnect the MAP sensor connector.
b. Turn the ignition switch ON.




c. Using a voltmeter measure the voltage between connector terminals VC and E2 of the wiring harness side.

Voltage: 4.5 - 5.5 V

d. Turn the ignition switch to LOCK.
e. Reconnect the MAP sensor connector.

2. INSPECT POWER OUTPUT OF MAP SENSOR
a. Turn the ignition switch ON.
b. Disconnect the vacuum hose on the air intake chamber side.




c. Connect a voltmeter to terminals PIM and E2 of the ECM, and measure the output voltage under ambient atmospheric pressure.
d. Apply vacuum to the MAP sensor in 13.3 kPa (100 mmHg, 3.94 in.Hg) segments to 66.7 kPa (500 mmHg, 19.69 in.Hg).
e. Measure the voltage drop from step c. above for each segment.




Voltage drop

f. Reconnect the vacuum hose to the air intake chamber.