California Vehicles

MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR INSPECTION
1. INSPECT POWER SOURCE VOLTAGE OF MAP SENSOR.



- Disconnect the MAP sensor connector.
- Turn the ignition switch ON.



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

Voltage (VC - E2): 4.5 - 5.5 Volts

- Turn the ignition switch to LOCK.
- Reconnect the MAP sensor connector.

2. INSPECT POWER OUTPUT OF MAP SENSOR.
- Turn the ignition switch ON.



- Disconnect the vacuum hose from the vacuum sensor.



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

Applied Vacuum | Voltage Drop
kPa (in.Hg) | Volts
13.3 (3.94) | 0.3 - 0.5
26.7 (7.87) | 0.7 - 0.9
40.0 (11.81) | 1.1 - 1.3
53.5 (15.75) | 1.5 - 1.7
66.7 (19.69) | 1.9 - 2.1

- If not as specified, replace the sensor.
- Reconnect the vacuum hose to the vacuum sensor.

Editors Note: Remember to check the source vacuum available to the MAP sensor.