Repairing a 'fried' N54 MSD80 DME

JMARS · 08-21-2012, 11:13 AM

Great Job! WOW!

marv85 · 08-21-2012, 11:24 AM

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.

Jeff@TopGearSolutions · 08-21-2012, 11:28 AM

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.

jb's335 · 08-21-2012, 11:44 AM

Quote:

Originally Posted by Jeff@topgearsolutions

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.

ar design II · 08-21-2012, 12:57 PM

nice work! Impressive!

marconi118 · 08-22-2012, 08:20 AM

what is the mosfet part N°?

Roy Cormier · 08-22-2012, 12:38 PM

IRF644S. This was the closest match I could find at Digi-Key when comparing the datasheets. The original part was IRF644B.

Rotary Rasp · 08-22-2012, 05:39 PM

Impressive!

E90Company · 08-22-2012, 05:43 PM

Genius! Nice work

nydog · 08-22-2012, 08:14 PM

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.

Roy Cormier · 08-23-2012, 08:38 AM

I was really hoping mine would have been covered too. The odometer had just gotten to 82,000 miles when this happened.

saxon · 09-20-2012, 03:47 PM

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

joec500 · 09-20-2012, 04:59 PM

Quote:

Originally Posted by saxon

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?

JamesM3M5 · 09-20-2012, 05:05 PM

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.

SkySoldier · 09-20-2012, 08:51 PM

Good job, a breath of fresh air around here. I like your other TT to

enrita · 10-16-2012, 06:28 AM

where you able to pinpoint the coils drivers?

Sered · 10-16-2012, 07:19 AM

I've never seen this; this is awesome.

akotten · 10-17-2012, 02:29 AM

Quote:

Originally Posted by Roy Cormier

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.

-Alex

._. · 12-02-2012, 07:08 AM

I'm only able to find IRF644SPBF, looking at the datasheet this seems fine, what do you think?

scottp999 · 12-02-2012, 08:38 AM

Great info. Curious, what was the dealer quote?

shaginwagon13 · 12-02-2012, 09:16 AM

Wow good for you for doing this.... no way in hell I would even attempt this on my car haha

dlbrooks18 · 12-02-2012, 09:39 AM

Are DMEs interchangeable between cars, what would this entail, jus wondering if it is indeed possible to swap a "flashed" DME?

08-21-2012, 11:13 AM	#23
JMARS Not Baned 85 Rep 1,352 Posts Drives: e92 Single-T Join Date: Aug 2008 Location: Boca Raton, FL iTrader: (5)	Great Job! WOW! __________________ FFTEC 900 - 6466 \| PR PI Stg4 \| Motiv Tune/BB/FF \| Spec Stg 2+ \| Quaife LSD \| DSS Half-shafts VRSF Race IC \| VRSF Charge Pipe \| Evo Dual Oil Cooler \| BC Coilover \| To be continued...
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08-21-2012, 11:24 AM	#24
marv85 Colonel 70 Rep 2,626 Posts Drives: '07 E92 335i MT Join Date: Jun 2010 Location: Bay Area iTrader: (7)	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. __________________ '07 E92 335i 6MT- HP650, inlets/outlets, ER FMIC, VRSF CP, LPFP stg2, CSF rad, 'is Aux rad, ER OC, Ohlins, M control arms, eibach front sway bar. '05 C55 AMG SOLD - '22 Tesla M3P \| '10 E92 335i M, 6MT COBB, FBO, st2 LPFP, Mfactory LSD \| '07 E90 335i, PTF COBB E50, FBO, HFS4
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08-21-2012, 11:28 AM	#25
Jeff@TopGearSolutions 3441 Rep 79,212 Posts Drives: C6 Z06, 09 335i, 10 335xi Join Date: Dec 2008 Location: www.TopGearSolutions.com iTrader: (37)	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, 12:57 PM	#27
ar design II Captain 44 Rep 773 Posts Drives: which one? Join Date: Jan 2012 Location: Denver, CO iTrader: (1)	nice work! Impressive!
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08-22-2012, 08:20 AM	#28
marconi118 Major 94 Rep 1,184 Posts Drives: 06/07 e93 335i Join Date: Nov 2008 Location: europe iTrader: (0)	what is the mosfet part N°?
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08-22-2012, 12:38 PM	#29
Roy Cormier Private 40 Rep 70 Posts Drives: E92 M3, E92 335i Join Date: Feb 2012 Location: Green Bay, WI iTrader: (0) Garage List E92 BMW 335i [0.00] E92 BMW M3 [0.00]	IRF644S. This was the closest match I could find at Digi-Key when comparing the datasheets. The original part was IRF644B. __________________ E92 M3 - Space Gray \| E92 335i - Alpine White If you can leave black marks on a straight from the time you exit a corner till the time you brake for the next turn....... Then, you have enough horsepower.
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08-22-2012, 05:39 PM	#30
Rotary Rasp Lieutenant Colonel 241 Rep 1,857 Posts Drives: 2009 E92 335i 6MT Join Date: Aug 2008 Location: SoCal - Torrance iTrader: (6)	Impressive! __________________
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08-22-2012, 05:43 PM	#31
E90Company Major General 194 Rep 6,136 Posts Drives: Car Join Date: Mar 2012 Location: FL iTrader: (2)	Genius! Nice work
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08-22-2012, 08:14 PM	#32
nydog Private First Class 40 Rep 191 Posts Drives: e92 M3 Join Date: Apr 2011 Location: Beacon, NY iTrader: (0)	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.
	Appreciate 0 Quote

08-23-2012, 08:38 AM	#33
Roy Cormier Private 40 Rep 70 Posts Drives: E92 M3, E92 335i Join Date: Feb 2012 Location: Green Bay, WI iTrader: (0) Garage List E92 BMW 335i [0.00] E92 BMW M3 [0.00]	I was really hoping mine would have been covered too. The odometer had just gotten to 82,000 miles when this happened. __________________ E92 M3 - Space Gray \| E92 335i - Alpine White If you can leave black marks on a straight from the time you exit a corner till the time you brake for the next turn....... Then, you have enough horsepower.
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09-20-2012, 03:47 PM	#34
saxon Captain 218 Rep 880 Posts Drives: s4 Join Date: Oct 2011 Location: pa iTrader: (3)	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, 05:05 PM	#36
JamesM3M5 Some dude 91 Rep 1,780 Posts Drives: E92 335i Join Date: Sep 2011 Location: Northern VA iTrader: (0)	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. __________________ RRT E92 335i/6MT with stuff and things
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09-20-2012, 08:51 PM	#37
SkySoldier Private 7 Rep 94 Posts Drives: Jet Black E90 335I Join Date: Mar 2008 Location: USA iTrader: (1)	Good job, a breath of fresh air around here. I like your other TT to __________________ 2008 Jet Black 335I E90 Mods: Procede, HPF intercooler, Helene filter, intake scoops, Riss Racing can, 18" VM V710 wheels, PIAA angel eyes, black grill, blacklines, 20% tint, OE CF splitters and spoiler. 1999 Pearl White 3000GT VR4 (far from stock)
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10-16-2012, 06:28 AM	#38
enrita Major General 159 Rep 7,378 Posts Drives: 335i - Big turbos Join Date: Sep 2008 Location: Italian in Sweden iTrader: (0)	where you able to pinpoint the coils drivers? __________________ 07 335i AT - MOTIV 750 - MHD E85 BMS flash - BMS PI - JB4G5 - Okada Coils - NGK 5992 Plugs - Helix IC - Snow Stg. 3 - Stett CP - Custom midpipes with 100 HJS Cats - Bastuck Quad - PSS10 - QUAIFE LSD - BMS OCC - Forge DVs - AR OC - ALCON BBK - M3 Chassi - Dinan CP - Velocity M rear Toe arms - Advan RZ-DF - LUX H8 - Level 10 AT upgrade
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10-16-2012, 07:19 AM	#39
Sered Major 146 Rep 1,201 Posts Drives: 08 E90 335i Join Date: Apr 2012 Location: Melbourne, FL iTrader: (3)	I've never seen this; this is awesome. __________________ '08 E90 w/ just boltons '09 Z4 sDrive35i w/ just boltons
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12-02-2012, 07:08 AM	#41
._. Colonel 74 Rep 2,353 Posts Drives: BMW Join Date: Jun 2009 Location: Miami iTrader: (15)	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, 08:38 AM	#42
scottp999 Brigadier General 133 Rep 4,764 Posts Drives: 4runner SR5 Join Date: Mar 2007 Location: MD iTrader: (2) Garage List 2007 BMW 335 [9.00]	Great info. Curious, what was the dealer quote?
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12-02-2012, 09:16 AM	#43
shaginwagon13 Chartered Accountant 64 Rep 970 Posts Drives: BMW 335i Coupe Join Date: Apr 2012 Location: Toronto iTrader: (4)	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, 09:39 AM	#44
dlbrooks18 Brigadier General 161 Rep 3,736 Posts Drives: e90 335i Join Date: Nov 2008 Location: Los Angeles iTrader: (2)	Are DMEs interchangeable between cars, what would this entail, jus wondering if it is indeed possible to swap a "flashed" DME? __________________ 2008 E90 335
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