Manifold Absolute Pressure (MAP) Sensor Inspection

Check sensor O-ring (1) for damage and deterioration.
Replace as necessary.

Fig 1: Checking O-Ring
Courtesy of SUZUKI OF AMERICA CORP.
Arrange 3 new 1.5 V batteries (2) in series and connect its positive terminal to "Vin" terminal of MAP sensor (1) and negative terminal to "Ground" terminal. Then check voltage between "Vout" and "Ground".
Also, check if voltage reduces when vacuum is slowly applied up to 400 mmHg by using vacuum pump (3). If check result is not satisfactory, replace manifold absolute pressure sensor.

CAUTION: As connection to wrong terminal will cause damage to manifold absolute pressure sensor, make absolutely sure to connect properly as shown in the figure.

MAP sensor output voltage ("Vin" voltage): 4.5 - 5.5 V, ambient temp. 20 - 30°C (68 - 86°F)

Fig 2: Manifold Absolute Pressure (MAP) Sensor Pressure/Voltage Chart
Courtesy of SUZUKI OF AMERICA CORP.

Fig 3: Checking Manifold Absolute Pressure (MAP) Sensor
Courtesy of SUZUKI OF AMERICA CORP.