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Thread: E36 P0340 Code After Cam Sensor Replaced

  1. #26
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    Quote Originally Posted by shadowpuck View Post
    Just wondering - would it be worth doing some basic circuit testing before calling the dme?
    Mostly just asking from my own curiosity.
    Tap. Tap. Is this thing on?
    '95 325iS - auto to manual swap done!

  2. #27
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    Quote Originally Posted by shadowpuck View Post
    Tap. Tap. Is this thing on?
    Yes it's on. What kind of circuit testing would you suggest? I would definitely give it a shot.

    Abel, I found one from the local CL parts junky for 40 bucks. Does it matter what letter is printed on it or if it comes from a manual or automatic? He has quite a few them so I'll have a choice.
    ​~Mike


  3. #28
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    It doesn't matter. But everything will be easier if it comes out of a 328. Auto or manual. The internal flash was written for both auto and manual. You would align ews, clear adaptations, clear codes. Done.

    I will take the cover off the bad dme today to look at it a little.
    Last edited by 328 Power 04; 03-06-2017 at 08:47 PM.
    -Abel

    - E36 328is ~210-220whp: Lots of Mods.
    - 2000 Z3: Many Mods.
    - 2003 VW Jetta TDI Manual 47-50mpg
    - 1999 S52 Estoril M Coupe
    - 2014 328d Wagon, self-tuned, 270hp/430ft-lbs
    - 2019 M2 Competition, self-tuned, 504whp
    - 2016 Mini Cooper S

  4. #29
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    I'd sure like to figure out exactly how rubbing those wires together managed to ignite a cylinder. It seems to me that would have to mean the coil wiring and the cam sensor wiring are both melted down somewhere deeper in the harness? Which would bring us to Greg's suggestion of testing the wiring. Otherwise, might not the problems recur with the new DMEs, on both cars?

    Chris Powell
    Racer and Instructor since, well. decades, ok?
    Master Auto Tech, owner of German Motors of Aberdeen
    BMWCCA 274412
    German Motors is hiring ! https://www.bimmerforums.com/forum/s...1#post30831471

  5. #30
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    It was explained to me as it happening inside the DME circuitry. Of course I'd like to know more too. It has happened before to Dave Markert too. Which is why it led to such a quick diagnosis.

    No blown fuses, no anything else.
    -Abel

    - E36 328is ~210-220whp: Lots of Mods.
    - 2000 Z3: Many Mods.
    - 2003 VW Jetta TDI Manual 47-50mpg
    - 1999 S52 Estoril M Coupe
    - 2014 328d Wagon, self-tuned, 270hp/430ft-lbs
    - 2019 M2 Competition, self-tuned, 504whp
    - 2016 Mini Cooper S

  6. #31
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    ok, so, i just got a look at the wiring near the connector where you pulled back the cover. wow! (i was looking previously on my phone and it didn't show the detail as well). i think i can even see corrosion on the wire strands themselves.

    as to the circuit testing - i was just thinking basic power/continuity tests to verify the integrity of the harness just so you don't have a melted spot someplace along the way....
    abel or chris - with the DME unplugged from power, would it be worth checking resistance on the appropriate pins? i'm just wondering if that would allow a confirmation that the driver failed....
    '95 325iS - auto to manual swap done!

  7. #32
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    I still have the bad DME,... (gave them a good one... some trade). I can run minor tests. I pulled the covers and there was no apparent visible damage for a few minutes of looking at it.
    -Abel

    - E36 328is ~210-220whp: Lots of Mods.
    - 2000 Z3: Many Mods.
    - 2003 VW Jetta TDI Manual 47-50mpg
    - 1999 S52 Estoril M Coupe
    - 2014 328d Wagon, self-tuned, 270hp/430ft-lbs
    - 2019 M2 Competition, self-tuned, 504whp
    - 2016 Mini Cooper S

  8. #33
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    ahh, understood - mostly just curious if we can find any kind of 'smoking gun.'
    '95 325iS - auto to manual swap done!

  9. #34
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    Certainly, all the smoke has been let out of the system...

    Chris Powell
    Racer and Instructor since, well. decades, ok?
    Master Auto Tech, owner of German Motors of Aberdeen
    BMWCCA 274412
    German Motors is hiring ! https://www.bimmerforums.com/forum/s...1#post30831471

  10. #35
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    Quote Originally Posted by bmwdirtracer View Post
    Certainly, all the smoke has been let out of the system...
    LOL! Thank you folks, he's here all week....
    '95 325iS - auto to manual swap done!

  11. #36
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    Quote Originally Posted by shadowpuck View Post
    ok, so, i just got a look at the wiring near the connector where you pulled back the cover. wow! (i was looking previously on my phone and it didn't show the detail as well). i think i can even see corrosion on the wire strands themselves.

    as to the circuit testing - i was just thinking basic power/continuity tests to verify the integrity of the harness just so you don't have a melted spot someplace along the way....
    abel or chris - with the DME unplugged from power, would it be worth checking resistance on the appropriate pins? i'm just wondering if that would allow a confirmation that the driver failed....
    Looks like you can see where two of the wires arc'ed too, but not sure. I just can't see why or how this happened.

    Anyway, Im going to try and pick up a DME tomorrow.
    ​~Mike


  12. #37
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    And congrats on hitting your 1000th post!

    Chris Powell
    Racer and Instructor since, well. decades, ok?
    Master Auto Tech, owner of German Motors of Aberdeen
    BMWCCA 274412
    German Motors is hiring ! https://www.bimmerforums.com/forum/s...1#post30831471

  13. #38
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    Quote Originally Posted by bmwdirtracer View Post
    And congrats on hitting your 1000th post!
    Ha!! you noticed Thanks! I just realized it after I posted,... Had to lean over and tell my wife lol
    Last edited by HeliHover; 03-06-2017 at 09:21 PM.
    ​~Mike


  14. #39
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    Man I really wanted this to be this easy.... Turns out, its not. I picked up a DME and Abel walked me through the EWS sync. I still have the same exact problem.

    Now what?
    ​~Mike


  15. #40
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    Like I said in the email, I'm VERY curious to find out. Can't believe there's more to this. Mine was fixed with the DME. Wonder if there are more harness issues.
    Mr. Shadowpuck your microphone is loud and clear.
    -Abel

    - E36 328is ~210-220whp: Lots of Mods.
    - 2000 Z3: Many Mods.
    - 2003 VW Jetta TDI Manual 47-50mpg
    - 1999 S52 Estoril M Coupe
    - 2014 328d Wagon, self-tuned, 270hp/430ft-lbs
    - 2019 M2 Competition, self-tuned, 504whp
    - 2016 Mini Cooper S

  16. #41
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    Looking for a diagram of an m52 harness so I can see what pins to check for continuity........

    otherwise internal engine components??
    ​~Mike


  17. #42
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    I have three wires. I should have 5 volts going to the sensor. So if I test the 3 wires, and find the two power wires, that would leave one left which should be the signal wire. I could then test continuity from that wire back to the DME. I found a chart that says it could be pin number 43. Am I on the right track here guys?
    Attached Images Attached Images
    ​~Mike


  18. #43
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    Going over a diagram (thanks Abel) I found my wires that needed to be checked. Last night I didn't really have any time to work on it, but I did manage to disconnect the plug and pull it up through the manifold so I could get a multimeter to it. I didn't have time to test continuity, but I tested for voltage and visually checked the harness. I found two of the three terminals producing 2.5 volts. That's all I got. When I would test the other terminal, I could hear a relay clicking? I wasn't putting any power to anything, just checking two wires for power. That part seemed weird to me. Anyway, today after work I should be able to test all the way to the DME harness.

    I keep reading generic machanic web pages about this code and most all of them say a bad crank sensor can cause this. They also all say check the wiring before replacing the sensor. I think after I confirm the wiring is good, I'm going to replace the crank sensor......
    ​~Mike


  19. #44
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    I tested for continuity to the DME and all was fine. I put my old DME back in.
    ​~Mike


  20. #45
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    And any difference?
    -Abel

    - E36 328is ~210-220whp: Lots of Mods.
    - 2000 Z3: Many Mods.
    - 2003 VW Jetta TDI Manual 47-50mpg
    - 1999 S52 Estoril M Coupe
    - 2014 328d Wagon, self-tuned, 270hp/430ft-lbs
    - 2019 M2 Competition, self-tuned, 504whp
    - 2016 Mini Cooper S

  21. #46
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    Continuity won't account for any other shorts, unless you crosscheck continuity across different pins. If it's still a short.
    -Abel

    - E36 328is ~210-220whp: Lots of Mods.
    - 2000 Z3: Many Mods.
    - 2003 VW Jetta TDI Manual 47-50mpg
    - 1999 S52 Estoril M Coupe
    - 2014 328d Wagon, self-tuned, 270hp/430ft-lbs
    - 2019 M2 Competition, self-tuned, 504whp
    - 2016 Mini Cooper S

  22. #47
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    I checked across all of them. There is definitely no shorts in the wires from the connection to the DME plug. I checked the other 2 pins after confirming the one had continuity, to make sure two of the three wires were not shorted.
    ​~Mike


  23. #48
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    Hi Mike,
    Let me just double check; I see that the factory ETM's pin out has an error anyway. (It shows two wires as being inputs to the DME from the cam sensor)

    You tested pin 64 of the DME plug (black wire) to pin 2 of the cam sensor plug?
    You tested pin 43 of the DME plug (brown) to pin 3?
    And pin 65 (Yellow) to pin 1?

    (Just to make sure we're on the same page)
    http://wedophones.com/Manuals/BMW/19...g%20Manual.pdf

    Did you do the voltage test with key on, engine off, DME grounded, cam sensor not plugged in? If so, try plugging in the cam sensor, and then backprobe the wires for voltage.

    And what have you done about those melted wires? I'd find it hard to believe that all the damage to those wires was confined to the area outside the shield, since the damage was SO complete there.

    Chris

    Chris Powell
    Racer and Instructor since, well. decades, ok?
    Master Auto Tech, owner of German Motors of Aberdeen
    BMWCCA 274412
    German Motors is hiring ! https://www.bimmerforums.com/forum/s...1#post30831471

  24. #49
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    Quote Originally Posted by bmwdirtracer View Post
    Hi Mike,
    Let me just double check; I see that the factory ETM's pin out has an error anyway. (It shows two wires as being inputs to the DME from the cam sensor)

    You tested pin 64 of the DME plug (black wire) to pin 2 of the cam sensor plug? Yes
    You tested pin 43 of the DME plug (brown) to pin 3? Yes
    And pin 65 (Yellow) to pin 1? Yes

    (Just to make sure we're on the same page- This is the same diagram I received from Abel.
    http://wedophones.com/Manuals/BMW/19...g%20Manual.pdf

    Did you do the voltage test with key on, engine off, DME grounded, cam sensor not plugged in? Yes, 2.5 volts If so, try plugging in the cam sensor, and then backprobe the wires for voltage. Ok, I will try this after breakfast.

    And what have you done about those melted wires? I'd find it hard to believe that all the damage to those wires was confined to the area outside the shield, since the damage was SO complete there. If your referring to the picture I posted, that was of the old cam sensor which is no longer in the car.

    Chris
    Thank You
    ​~Mike


  25. #50
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    Ok. Took a min to eat breakfast

    With the cam sensor plugged in, I get no voltage with the key in position 2. If I unplug the sensor, the voltage goes back to 2.5 volts.
    ​~Mike


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