Suzuki Swift MK VII 1.2 2011 - MAP sensor - undulating speed (location)

Hello,
When idling, the car fluctuates (800-600 rpm). The computer showed no sensor MAP data

Where is this MAP sensor in my car - I would like to replace it myself and save some cash.

Do you have this sensor error or only constant reading?
What you are showing in the graph is atmospheric pressure and this is different.
If the engine has a MAF flow meter then there is no MAP.
If there is MAP, look for it on the intake manifold or a hose connected to the manifold and at the other end of the sensor.
Sometimes such saving is more expensive because the efficient elements are replaced.

The problem with reading from MAP has been saved in the computer and returns after being deleted.

I was able to locate the sensor - it is under the first intake manifold from the left. Little space to dismantle because I have an LPG installation installed. Normally access is ok.


I'll try to clean it - we'll see if it improves anything.

Check if the sensor has power and you can use the meter to check the signal at its output by measuring to ground.
Alternatively, look for something like manifold pressure in the measuring blocks because Delphi is cheating you or has a wrong description.
If there were atmospheric pressure (the reading would be atmospheric), this engine would be flooded at idle. Unless the measurement was made with the engine turned off.

I checked the power supply - with the sensor disconnected on the plug, I have:
1 - (+ 5.01V)
2 - (GDN)
3 - (+ 4.98 V)

I understand that I have to take the measurement with the engine running and the sensor connected. I want to connect the third pin (measuring) with a voltmeter to ground and now the question - what voltage values should I observe at idle and whether the voltage will increase or decrease when increasing the revolutions, assuming that the sensor is working properly.

The closer the pressure is to atmospheric, the higher the voltage.
With the engine off, but the ignition should be at maximum voltage.
At idle, the lowest, when suddenly pressing the accelerator pedal, should be close to the maximum to drop again immediately.
It's best to get a vacuum pump. The sensor should be linear and, for example, each 0.1 bar change should change the voltage by the same value.

The cause of the fluctuation in rotation was a dirty throttle.
I washed it in gasoline and WD40 to dissolve the deposits. After connecting, the car did not want to revolve and a few errors with the throttle popped out, but I opened and closed it several times and it unlocked. Now it works equally at 620-650 rpm, the same on LPG and on petrol. This is what the damper looked like before cleaning - you can see black carbon deposits around the valve.

After the repair - I drove about 5 km and no errors. I will let you know what will happen next.

I have already traveled over 200 km calmly and no errors have popped up, so I think that the fault is removed - the topic is to be closed.