What is the absolute pressure sensor and why does it break down?

The absolute pressure sensor is an integral part of the electronic engine management system. It is he who reacts to the slightest changes in pressure in the intake tract. The control unit, guided by the readings of this sensor, ensures the normal start and operation of the internal combustion engine both in urban and suburban conditions.

What does this part consist of?

The absolute pressure sensor (VAZ) consists of several parts. These include the signal re-processing circuit, the converter, which is equipped with a special sensing element, as well as many body parts. In general, the element itself is very reliable, it can break only as a last resort. Below we will consider those situations, because of which this part fails.

Absolute pressure sensor in the intake manifold and its malfunction

Depending on how the electronic engine management system works (whether it has a mass air flow sensor or not), this element may become unusable for a variety of reasons that lead to switching the operation mode of the ICE to an emergency one. In the worst case, the engine does not start at all because of faults in this part. In general, the main source of such trouble is the poor connection between the sensor and the inlet fitting.

It often happens that the engine goes into emergency mode due to a stalled pipeline. The last spare part has a very flexible design. Therefore, if the absolute pressure sensor breaks down, carefully check the condition of the pipeline.

In addition, one of the causes of faults in this part is the broken air temperature sensor. It is strongly interrelated with the absolute pressure device (both can be combined into one), so the breakdown can occur immediately in two parts.

Most rarely there are cases when the absolute pressure sensor itself comes into malfunction, and all other parts of the electronic engine control unit continue to function. In this case, you need to send the car for diagnosis and check the status of this item. By the way, this process can be done without reference to the SRT. It is enough to connect the wire to the nipple and then monitor the output signal of the sensor with the engine on.

Why can there be a breakdown?

Most often the faults of this part arise from the depressurized vacuum hose, which may or may not be connected to the MAP sensor, or simply damaged. Another failure may occur due to a short circuit that occurred in the electronic circuit of the sensor signal. In addition, the problem may be in the clipping of the mass. And the biggest reason is the malfunction of the entire electronic engine control unit. In this case, you need to do everything with the help of specialists and in no case should you repair the system yourself (unless, of course, you are an experienced mechanic). This happens very rarely, but every car has a risk of breakage.