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How to check BOSCH MAP-Sensor (part no. 0 261 230 284) ?

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Greybeard:
I calculated the intake manifold pressures:

@ idle:
(2.01 V - 1.93 V) / 1.8 (V/bar) = 0.044 bar = 0.64 psi (positive pressure)

@ ~3000 rpm:
(2.3 V - 1.93 V) / 1.8 (V/bar) = 0.206 bar = 2.93 psi (positive pressure)

Does that sound realistic for a turbo diesel engine?

crerus75:
Sorry for not getting back to you Greybeard, I just saw your reply.

There are 2 ways to verify:
1-- Hook a pressure/vacuum gauge up to the intake manifold and verify that what the sensor is reading is close to what the gauge is reporting.

OR

2-- Bench test the sensor.  You can use a benchtop power supply or you can remove it from the intake manifold but leave it hooked up to the car's wiring harness.  If hooked up to the car, turn the key on but do not start the engine.  This should provide power to the sensor.  You can then apply a known pressure or vacuum using a hand pump or similar and verify that the sensor output is close.

Either method will work fine and it will probably boil down to whether a gauge is easier for you to obtain than a hand pump.  Both are readily available on Amazon and other sources.

Pressure/vacuum pump:
https://www.amazon.de/-/en/Vacuum-Pressure-Tester-Bleeding-Device/dp/B08CRQ4QVF/ref=sr_1_2?crid=KV4CD9QDV94J&dib=eyJ2IjoiMSJ9.P7swDp1Anp9fxKor0DSn9NtVkltkcK7uyXZgmV3rY9YuslsON5ZTd4Lodl9dAlx8KJkwlrlidx7QidQe1cN5Vp6VHy8twcYxl7wdK6UFe0oEn3G_3R4dWLcDPKWaEQhbNJMVO3cxBdhMhajUkKj11KG5V-W-pB7rQL7VOdPFw-g6deJBMHvTH9pnu98isQiV5jZ2700qwrY1ejxthr83DY1-PgdlbHSxBXW8fnpz9lCXFBdti1B12KDJrq9ieXG4yl5OmREWecOyTK0uppVmtPgA7LdbYu3wZwWRQWO1TDc.aSDydFS0_kk07wkwdqmQiglN3mx4y9ffmlYafKkdlCk&dib_tag=se&keywords=pressure+vacuum+gauge&nsdOptOutParam=true&qid=1733158622&sprefix=pressure+vacuum+gauge%2Caps%2C151&sr=8-2

Pressure/vacuum gauge:
https://www.amazon.de/-/en/MRCARTOOL-Carburetor-Automatic-Pressure-Diagnostic/dp/B08HCXLT94/ref=sr_1_5?crid=KV4CD9QDV94J&dib=eyJ2IjoiMSJ9.P7swDp1Anp9fxKor0DSn9NtVkltkcK7uyXZgmV3rY9YuslsON5ZTd4Lodl9dAlx8KJkwlrlidx7QidQe1cN5Vp6VHy8twcYxl7wdK6UFe0oEn3G_3R4dWLcDPKWaEQhbNJMVO3cxBdhMhajUkKj11KG5V-W-pB7rQL7VOdPFw-g6deJBMHvTH9pnu98isQiV5jZ2700qwrY1ejxthr83DY1-PgdlbHSxBXW8fnpz9lCXFBdti1B12KDJrq9ieXG4yl5OmREWecOyTK0uppVmtPgA7LdbYu3wZwWRQWO1TDc.aSDydFS0_kk07wkwdqmQiglN3mx4y9ffmlYafKkdlCk&dib_tag=se&keywords=pressure+vacuum+gauge&nsdOptOutParam=true&qid=1733158622&sprefix=pressure+vacuum+gauge%2Caps%2C151&sr=8-5

Note that the gauge only goes up to 10PSI (less than 1 BAR), so be careful when testing anything with positive manifold pressure (IE a turbocharger in your case).

If you're still diagnosing this, please let us know what you find.


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