E46 320i & 330Ci DSC Pressure Sensors
Page 1 of 2 12 LastLast
Results 1 to 10 of 18
  1. #1
    BFI Hero
    Nathb's Avatar
    Join Date
    Apr 2012
    Location
    London
    Posts
    1,865
    Car Specs:
    Year
    2004
    Model
    E46
    Engine
    330Ci
    Fuel
    Petrol
    Thanks
    564
    Thanked 1,025 Times in 782 Posts


    Donate Please click the
    image to support
    BMWForums.info
    Click Here To Contribute To Our Site

    320i & 330Ci DSC Pressure Sensors

    Hello,

    Before I take the hit and order four of these things is there any underlying issues that could cause them to flag up?

    Just finding it very hard to believe that both cars will have them fail within a week or so of each other.

    Thanks

  2. #2
    Banned
    dailydoggy's Avatar
    Join Date
    Mar 2012
    Location
    cheshire
    Posts
    3,710
    Car Specs:
    Year
    2001
    Model
    E46
    Engine
    330i
    Fuel
    Petrol
    Thanks
    661
    Thanked 2,360 Times in 1,417 Posts


    you mean the brake line pressure sensors?


    fairly common failure for one of them to fail at some point...

    think there is a GUI screen in INPA for checking both brake line applied brake pressures IIRC..
    Last edited by dailydoggy; 16-08-2012 at 07:02.

  3. The Following User Says Thank You to dailydoggy For This Useful Post:

    Nathb (16-08-2012)

  4. #3
    BFI Hero
    Nathb's Avatar
    Join Date
    Apr 2012
    Location
    London
    Posts
    1,865
    Car Specs:
    Year
    2004
    Model
    E46
    Engine
    330Ci
    Fuel
    Petrol
    Thanks
    564
    Thanked 1,025 Times in 782 Posts


    Number 2 on here:


    INPA confirmed it's goosed.


    Is this the screen your talking about?



    Just finding it very hard to believe that both cars would have this happen, or just my bad luck? :(

    Thanks

  5. #4
    But you can call me cat-snake.
    Site Admin
    Ferret's Avatar
    Join Date
    Mar 2012
    Location
    Lincolnshire
    Posts
    7,647
    Car Specs:
    Year
    2001
    Model
    E46
    Engine
    330
    Fuel
    Momentum
    Thanks
    4,287
    Thanked 5,095 Times in 3,168 Posts


    Your "Print brake circuit 1 & 2" look alright.... Press the brakes, and watch the bars rise, thats if it does rise.

  6. The Following User Says Thank You to Ferret For This Useful Post:

    Nathb (16-08-2012)

  7. #5
    BFI Hero
    Nathb's Avatar
    Join Date
    Apr 2012
    Location
    London
    Posts
    1,865
    Car Specs:
    Year
    2004
    Model
    E46
    Engine
    330Ci
    Fuel
    Petrol
    Thanks
    564
    Thanked 1,025 Times in 782 Posts


    Quote Originally Posted by Ferret View Post
    Your "Print brake circuit 1 & 2" look alright.... Press the brakes, and watch the bars rise, thats if it does rise.
    Sorry ignore the screen shot it's one I took of the 320i the first time around.

    From memory last night the figures where:

    Print Circuit:
    1 - -0.7
    2 - 10

    Offset Print Circuit:
    1 - -0.7
    2 - 8.3

    I'll hook it up again in a bit and get some screen shots.

    It's probably back to normal now, they tend to settle down over night?

    Edit: Just been out to it and it's still showing up. I'll get some screenshots once my laptop has some juice in it.
    Last edited by Nathb; 16-08-2012 at 08:36.

  8. #6
    BFI Hero
    Nathb's Avatar
    Join Date
    Apr 2012
    Location
    London
    Posts
    1,865
    Car Specs:
    Year
    2004
    Model
    E46
    Engine
    330Ci
    Fuel
    Petrol
    Thanks
    564
    Thanked 1,025 Times in 782 Posts


    Oddly I got into the car an hour ago and the DSC lights were on.

    Went back into it 20 minutes ago and no warning lights.

    Anyway here's the diagnostic results:

    First DIS confirms there's an issue on test, but isn't present so unable to delete:


    INPA:

    First hook up:


    Pumping the brakes 10 times without the engine on:


    Engine on:


    and kept rising:


    Oddly no warning lights came back on, as soon as the pressure gets to 5.01 on the 320i the lights come on?

  9. #7
    But you can call me cat-snake.
    Site Admin
    Ferret's Avatar
    Join Date
    Mar 2012
    Location
    Lincolnshire
    Posts
    7,647
    Car Specs:
    Year
    2001
    Model
    E46
    Engine
    330
    Fuel
    Momentum
    Thanks
    4,287
    Thanked 5,095 Times in 3,168 Posts


    I can only assume the 330 has different tolerances of when to bring the warning light on, as it has bigger brakes (and brake pipes) ?

    Strange how it thinks there's 5 bar of pressure. The usual way to fail, is the reading goes to maximum.
    Question is though, is the sensor failing, or is there really 5 bar of pressure in that circuit.

    Wait for someone else to chip in, but it may be worth swapping the 2 sensors around (not the electrical connectors). If sensor 2 still stays at 5 bar, then theres an issue with the circuit. If the problem moves to sensor 1, then its the sensor.

  10. The Following User Says Thank You to Ferret For This Useful Post:

    Nathb (16-08-2012)

  11. #8
    BFI Hero
    Nathb's Avatar
    Join Date
    Apr 2012
    Location
    London
    Posts
    1,865
    Car Specs:
    Year
    2004
    Model
    E46
    Engine
    330Ci
    Fuel
    Petrol
    Thanks
    564
    Thanked 1,025 Times in 782 Posts


    Quote Originally Posted by Ferret View Post
    I can only assume the 330 has different tolerances of when to bring the warning light on, as it has bigger brakes (and brake pipes) ?

    Strange how it thinks there's 5 bar of pressure. The usual way to fail, is the reading goes to maximum.
    Question is though, is the sensor failing, or is there really 5 bar of pressure in that circuit.

    Wait for someone else to chip in, but it may be worth swapping the 2 sensors around (not the electrical connectors). If sensor 2 still stays at 5 bar, then theres an issue with the circuit. If the problem moves to sensor 1, then its the sensor.
    Ah didn't think of that!

    Both cars have never gone to the Maximum, I think the highest I've seen them at is 9.5? The 330ci's highest being 8.30 last night, the 320i has been up to 9.5. But never all the way to 20?

    The 320i had some second hand sensors fitted (as a trail) and the issue went away for a few weeks but then came back.

    If there is a build up of pressure are we talking a sticky caliper? or a kinked line?

    Thanks
    Last edited by Nathb; 16-08-2012 at 10:12.

  12. #9
    But you can call me cat-snake.
    Site Admin
    Ferret's Avatar
    Join Date
    Mar 2012
    Location
    Lincolnshire
    Posts
    7,647
    Car Specs:
    Year
    2001
    Model
    E46
    Engine
    330
    Fuel
    Momentum
    Thanks
    4,287
    Thanked 5,095 Times in 3,168 Posts


    Quote Originally Posted by Nathb View Post
    If there is a build up of pressure are we talking a sticky caliper? or a kinked line?
    I'm not sure what would cause the build up of pressure. It would surely be something to do with the master cylinder, ABS pump or there abouts. Have to wait for the mechanics to chip in

  13. The Following User Says Thank You to Ferret For This Useful Post:

    Nathb (16-08-2012)

  14. #10
    BFI Hero
    Nathb's Avatar
    Join Date
    Apr 2012
    Location
    London
    Posts
    1,865
    Car Specs:
    Year
    2004
    Model
    E46
    Engine
    330Ci
    Fuel
    Petrol
    Thanks
    564
    Thanked 1,025 Times in 782 Posts


    Quote Originally Posted by Ferret View Post
    I'm not sure what would cause the build up of pressure. It would surely be something to do with the master cylinder, ABS pump or there abouts. Have to wait for the mechanics to chip in
    Thanks!

    The only thing I can think of is that on Sunday I hooked up the 330ci to INPA to compare the pressues to that of the troubled 320i. All 4 of the pressures were showing as -0.7, I cleared the DSC memory to check it was resetting in the same way. I then disconnected it but didn't drive the car until Wednesday. This is when the issue has occurred. Could I have done something on INPA?!?!

Page 1 of 2 12 LastLast

User Tag List

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •