Manifold Absolute Pressure (MAP) Sensor Inspection

1. Check sensor O-ring (1) for damage and deterioration. Replace as necessary.
   Fig 1: Checking Sensor O-Ring

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2. Arrange 3 new 1.5 V batteries (2) in series and connect its positive terminal to "Vin" terminal 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 (1).

1. Manifold absolute pressure output voltage ("Vin" voltage:  4.5 - 5.5 V, ambient temp. 20 - 30 °C (68 - 86 °F))

Fig 2: MAP Sensor Pressure/Voltage Chart

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Fig 3: Checking MAP Sensor

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