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Diesel Engines A forum dedicated to diesel engines fitted to Volvo cars. See the first post in this forum for a list of the diesel engines. |
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Boost presure sensorViews : 867 Replies : 8Users Viewing This Thread : |
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Jun 22nd, 2018, 13:47 | #1 |
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Boost presure sensor
On a 5204T3 engine XC60, were is the boost presure sensor? mine is showing consistantly higher readings than the desired value. I think this is the cause of my overboost error message but dont know its location.
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Jun 22nd, 2018, 20:28 | #2 |
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Yes , this is becoming a more common problem , The sensor is down low on the left side in the intercooler plastic outlet stub , near the coolant hose where it goes into the bottom of the radiator . about £88 from the dealer .
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Jun 22nd, 2018, 20:43 | #3 |
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Thanks Clan I will have a look tomorrow.
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Jun 23rd, 2018, 12:43 | #4 |
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Hi
your boost sensor maybe working correctly , the car maybe over boosting have you go a obd2 reader, if yes what is your MAP reading with the car on but with the car not running if it is about 1bar, I would say the sensor is ok, Dave |
Jun 23rd, 2018, 12:49 | #5 |
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ambient atmospheric pressure is indeed around 1000 mb however if the sensor records even 20 mb wrongly it will upset the engine . There are 3 atmospheric pressure sensors in the ECM system and they should all read the same obviously, within 10 mb I would say. These sensors don't just fail they give a slightly inaccurate reading .. and the only ones which give the wrong reading are those in the intercooler outlet pipe .
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Jun 23rd, 2018, 13:23 | #6 |
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Hi clan
I always look to match with the atmospheric pressure sensors in the ECM, the ones in the intercooler do fill with oil over time, but a test could save £50-£80, Dave |
Jun 30th, 2018, 11:22 | #7 | |
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Quote:
Dave |
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Jun 30th, 2018, 21:33 | #8 |
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Found the sensor following Clan's directions! really tucked away down there, ordered a new Sensor and fitted it £40 from ebay now readings for desired and actual Boost presure are nearly exactly the same and rise and fall in sync. No alarms to date.
The old one was always 150 - 175 hpa above the desired value, even at tickover, so it seems they do fail by reading higher than the true value. So far so good and great direction from Clan. |
Jul 1st, 2018, 00:53 | #9 |
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That's brilliant news,
My 2002 D5 was fitted with a 2.5bar sensor , but with a remap, the sensor needs to read higher so it can go into limp mode if over boosting, so I have now fitted a 4bar sensor, and that will be good for if I mod the turbo, Dave |
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