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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Sun, Oct-19-2008, 07:17:59 PM   #11
Chris(NJ)
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Quote:
Originally Posted by Pantera View Post
The timing of this couldn't have been better, although I wish I wouldv'e found it prior to being charged about $350 in diagonostic fees...........................
This post is definitely interesting. I too would write those symptoms off as something not related to the smg system. I've noticed my passenger door not always unlocking w/ the key, even after multiple attempts. It will take me to lock the door, then unlock it again. I just figured it was strange and havent though much about it. Now you have me wondering. I ordered 2 new relays last night. I'm going to change it out right away as preventative maintenance, and keep the other in the glove box, just in case.
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Old Fri, Nov-14-2008, 02:46:10 PM   #12
m3 hal
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added some part numbers and placed the relay and overall system schematic pics inline

if someone knows the hood sensor part numbers that will pretty much complete the list of part numbers for the major components of the system
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Old Sun, Nov-30-2008, 10:06:51 PM   #13
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I guess I'll add my issues with the SMG system. A few days ago I was on my way to work and noticed the car had a hard time taking off in 2nd. Felt like it was struggling similar to when you lag the engine in a manual. It was 20 degree whether so I attributed it to the outside temp. I drove a about 100 feet and the car starts sputtering and dies in the middle of the road.

I turn the car off and restart it but now the car is making all sorts of crazy noise and gear indicator is going all over the place; from 2 to 4 or 5. I just want to get it off the road so as not to block traffic. Whenever it went to 5 I shifted it down and it would go to 2 but then go back to 5 all on its own. All the while it sounds like the transmission or engine is about to explode. The smg light is on constant throughout the whole ordeal.

I finally get to a safe area and turn the car off. Waited 5 minutes and attempted to start the car again. Nothing, just smg light. I thought I heard the pump go off but it may have been just the fuel pump. I disconnect the battery for 20 minutes in hopes of a reset. Nothing, just smg light. I disconnect the batter again and wait 60 minutes. Nothing, just smg light. So I have the car towed to my house.

I came on here and found the SMG relay replacement troubleshooting guide and replaced it to no avail. I removed the battery and charged it still no success. I don't know what else I can do short of taking the car to an indy to fully diagnose the problem.

Here's a run down of the symptons:

1. Car stalled then died
2. SMG light constantly on
3. Car does not start or crank ( I think the fuel pump comes on tho)
4. Already replaced the salmon colored relay
5. Brake pedal is really hard
6. Whet through several key cycles which did not resolve the issue
7. I can move the shifter to the left and right but it still reads a 0 on the gear indicator

I did smell a burning odor (seemed electrical) on the day the issue first occured. I've combed over the forums several times to see if there's any other way I can reset the smg ecu besides a batter pull to no avail. I'm about ready to bite the bullet and take the car to a mechanic.
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Old Tue, Jan-20-2009, 10:34:59 PM   #14
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revised part number for the hood switch

p/n: 61319119052


are there really two of these under the hood? I can only find one by the battery terminal on the passenger side.
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Old Wed, Jan-28-2009, 06:25:31 PM   #15
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Here's a simple one that will make you feel stupid (happened to me and another friend w/SMG):

Issue: Engine off, ignition on; pressing the brake pedal as normal and the transmission won't go into neutral to start the car regardless of moving the shifter left.

Duuuh Solution: Press the brake pedal more firmly. If for whatever reason you've pumped your brakes with the engine off and pedal feel becomes firm, light brake pedal engagement won't register. You have to mash the brake pedal if this is the case. Up until then I had been used to lightly pressing the brake when I start my car.

My friend and I on separate occasions were like, "aah crap, SMG failed somehow" until we realized the stupidity of it all.

On a separate note, this thread needs to be stickied. After reading this thread and others I've bought a spare SMG relay that I keep in my glovebox
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Old Wed, Jan-28-2009, 06:45:01 PM   #16
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Quote:
Originally Posted by funkboy316 View Post
revised part number for the hood switch

p/n: 61319119052


are there really two of these under the hood? I can only find one by the battery terminal on the passenger side.
Thanks, adding the PN now. I will have to double check but I'm pretty sure there are 2 of them.

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Originally Posted by daytonaviolet View Post
great thread
with as much help as I get from others on here I figure the least I can do is put a bunch of links together and consolidate the mass of disorganized information out there
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Old Tue, Feb-24-2009, 09:17:48 PM   #17
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thanks for the compliments

be sure and add your comments if you see something that isn't covered or is incorrect/unclear
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Old Tue, Feb-24-2009, 11:00:40 PM   #18
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good idea to keep an extra smg relay in the glovebox...
but if you find yourself in a jam and didn't buy an extra, there is one behind the glovebox...
part #2
http://www.realoem.com/bmw/showparts...=61&fg=25&hl=6

(don't know what effect, if any, this will have by disconnecting the air pump...but will work in an emergency if you need to get the car out of an intersection or off the highway)
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Old Tue, Mar-10-2009, 08:45:01 PM   #19
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Quote:
Originally Posted by .333 snubnose View Post
good idea to keep an extra smg relay in the glovebox...
but if you find yourself in a jam and didn't buy an extra, there is one behind the glovebox...
part #2
http://www.realoem.com/bmw/showparts...=61&fg=25&hl=6

(don't know what effect, if any, this will have by disconnecting the air pump...but will work in an emergency if you need to get the car out of an intersection or off the highway)
Wow, very interesting find. How exactly can you get to this relay (through the cabin or under the hood...)?
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Old Sat, Mar-21-2009, 04:13:39 PM   #20
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Here's a new one for you all...

My mate's M3 sometimes 'misses' a gear and crunches it. He reckons it didn't do it for the first year of ownership, but has done it 4 or 5 times in the last 6 months. Says it's a different occasion each time - has happened to him on track twice (scary!), once as he was cruising along about 5 mins after starting it, and once with me in the car on the motorway. Same again, simply cruising along. Thing he was changing up to 6th. On track he reckons he never gets above 4th but can't remember what gear he was selecting when it crunched.

Any suggestions? It's out of warranty so I told him to avoid the dealers initially as they'll just replace the pump/box.

I checked the hydraulic fluid with him and it seems a little above the max marker...
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Discussing SMG troubleshooting FAQ in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)