Manifold absolute pressure sensor
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Manifold absolute pressure sensor
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The task of the pressure sensor is to inform the engine control module of the current pressure in the intake manifold.
The pressure sensor has the following connections
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1.
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Power supply: Pin 1 on the pressure sensor is connected to pin 82 on the engine control module.
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2.
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Sensor ground: Pin 2 on the pressure sensor is connected to pin 93 on the engine control module
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3.
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Signal, pressure in intake manifold: Pin 3 on the pressure sensor is connected to pin 85 on the engine control module
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The pressure sensor is located on top of the intake manifold on the left-hand side of the engine. It is a piezoresistive sensor with its own electronics for signal amplification and temperature compensation. The electronics are all semi-conductor type integrated on a chip.
The voltage of the pressure sensor changes with the pressure.
If the sensor input is short-circuited to B+, diagnostic trouble code P0120 will be generated.
If the sensor input is short-circuited to ground, diagnostic trouble code P0121 will be generated.
System reaction to a fault
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As soon as the control module detects a fault, the substitute value of 1024 hPa is used.
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The diagnostic instrument reading is 350 kPa when P0120 has been generated.
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The diagnostic instrument reading is 0 kPa when P0121 has been generated.
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