What are the symptoms of a faulty intake manifold pressure sensor?

[SanCamilla]

Intake manifold pressure sensor failure symptoms include: 1. Open or short circuit inside the sensor; 2. The sensor output signal cannot change with the variation of intake manifold vacuum; 3. The output signal voltage is too large or too small, deviating from the normal range; 4. Blockage or leakage in the vacuum hose between intake pipes, or clogged vacuum ports in the intake manifold. The intake pressure sensor, abbreviated as MAP, connects to the intake manifold via a vacuum tube. It senses vacuum changes within the intake manifold under different engine speeds and loads, then converts these changes into voltage signals through internal resistance variations, which the ECM uses to adjust fuel injection quantity and ignition timing angle.

[LaReed]

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