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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Repairing a 'fried' N54 MSD80 DME



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      08-21-2012, 11:13 AM   #23
JMARS
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Great Job! WOW!
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      08-21-2012, 11:24 AM   #24
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Respect Sir! you must have done quite a lot of probing to pinpoint the problem. Luckily only that transistor was fried.

Thanks for sharing the processor's ballmap.
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      08-21-2012, 11:28 AM   #25
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Just when I thought I was the man for hooking up a car stereo this guy comes in!

Nice work man. Electronics and I dont mix.
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      08-21-2012, 11:44 AM   #26
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Quote:
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Just when I thought I was the man for hooking up a car stereo this guy comes in!

Nice work man. Electronics and I dont mix.
I hate electronics too. Thats why we have an electronics guy on staff and its not me lol.
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      08-21-2012, 12:57 PM   #27
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nice work! Impressive!
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      08-22-2012, 08:20 AM   #28
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what is the mosfet part N?
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      08-22-2012, 12:38 PM   #29
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IRF644S. This was the closest match I could find at Digi-Key when comparing the datasheets. The original part was IRF644B.
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      08-22-2012, 05:39 PM   #30
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Impressive!
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      08-22-2012, 05:43 PM   #31
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Genius! Nice work
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      08-22-2012, 08:14 PM   #32
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Very nice job!

For those not as brave as you. I had the same codes on my new acquired 07 335i, 37k miles with no warranty. Turns out DME is covered under Federal Emissions Warranty, 8yrs or 80,000 miles. This took me digging in plain site to find out, page 39 of the service and warranty manual. The dealer informed me I'm covered today.
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      08-23-2012, 08:38 AM   #33
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I was really hoping mine would have been covered too. The odometer had just gotten to 82,000 miles when this happened.
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      09-20-2012, 03:47 PM   #34
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can you tell me exactly how you found out that that was the faulty part? i keep getting a cylinder 5 misfire and cant figure out why, figuring its something in the dme
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      09-20-2012, 04:59 PM   #35
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Quote:
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can you tell me exactly how you found out that that was the faulty part? i keep getting a cylinder 5 misfire and cant figure out why, figuring its something in the dme
I was curious if you would also get a 30BB failure if it was actually a DME issue?
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      09-20-2012, 05:05 PM   #36
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I emailed Pico Technologies to ask whether their scopes can check firing circuit on the piezo direct injectors. I have a Pico 3223, used it to look at all sorts of electronics problems from a diagnostic standpoint. If they ever email me back, I'll let you know what it takes to scope the injector circuit. The coil circuit is easy.

He checked wiring diagrams and found a shorted transistor for injector #5. Looks like a wiring harness fault took out the transistor, not an internal failure.
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      09-20-2012, 08:51 PM   #37
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Good job, a breath of fresh air around here. I like your other TT to
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      10-16-2012, 06:28 AM   #38
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where you able to pinpoint the coils drivers?
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      10-16-2012, 07:19 AM   #39
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I've never seen this; this is awesome.
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      10-17-2012, 02:29 AM   #40
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Quote:
Originally Posted by Roy Cormier View Post
I was really hoping mine would have been covered too. The odometer had just gotten to 82,000 miles when this happened.
Nice work! I didn't realize you were on the forums here haha. This place needs some good DIY's.


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      12-02-2012, 08:08 AM   #41
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I'm only able to find IRF644SPBF, looking at the datasheet this seems fine, what do you think?
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      12-02-2012, 09:38 AM   #42
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Great info. Curious, what was the dealer quote?
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      12-02-2012, 10:16 AM   #43
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Wow good for you for doing this.... no way in hell I would even attempt this on my car haha
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      12-02-2012, 10:39 AM   #44
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Are DMEs interchangeable between cars, what would this entail, jus wondering if it is indeed possible to swap a "flashed" DME?
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