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Home >> Chevrolet >> 1999 >> Tracker 4D Utility, 4WD, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Tests >> DTC P1408: Manifold Absolute Pressure (Map) Sensor Circuit >> Circuit Description

Circuit Description

MAP sensor measures change in intake manifold pressure (vacuum). PCM applies 5 volts to MAP sensor. Change in pressure that results from engine load and RPM changes is converted into a voltage signal that is monitored by PCM. By monitoring sensor output voltage, PCM can detect a change in manifold pressure.

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