Atmospheric pressure sensor
| Atmospheric pressure sensor |
The atmospheric pressure sensor, located on the right-hand side of the radiator, informs the control module of the current atmospheric pressure. This is used to calculate smoke limitation. The higher above sea level the car, the less oxygen there is in the air, resulting in the need for fuel supply reduction. Atmospheric pressure also controls turbo pressure, which must also be reduced at high altitudes so that the turbo does not overspeed.
The atmospheric pressure sensor connections are
| 1. |
Power supply: Pin 1 on the sensor from pin 31 on the engine control module.
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| 2. |
Sensor ground: Pin 2 on the sensor from pin 8 on the engine control module.
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| 3. |
Signal atmospheric pressure: Pin 3 on the sensor to pin 44 on the engine control module.
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The pressure sensor is a piezo-resistive sensor with its own electronics for signal amplification and temperature compensation. The electronics in the sensor are semi-conductors, mounted on a chip that bends with changes in the air pressure. This allows more or less power through depending on the outside air pressure.
| Diagnosis |
If a fault occurs in the absolute pressure circuit, one of the following DTCs can be generated
P1106 Absolute pressure sensor. Intake manifold. Plausibility fault with Atmospheric pressure.
P1107 Atmospheric pressure sensor. Open circuit / Short to Ground.
P1108 Atmospheric pressure sensor. Short to B+.
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