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///M3 Forum
The BMW E46 ///M3 is the M version E46 and puts out an amazing 333 HP and 262 lb-ft of torque at stock specs! There are an amazing amount of modifications for both the coupe and convertible models so read up and get started modifying your cars today!

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Old 10-09-2011, 09:30 AM   #1
roadtrip1098
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Join Date: Aug 2011
Location: Winslow, ME
Posts: 351
My Ride: 04 M3 SMG LSB
SMG Gear Position Sensor DIY - Finally!

Symptoms as they progress:

Sluggish shifting
Starting in 2nd gear on occasion
Gear Cog Light
Eventually only able to use R, 2, 5 and 6.

Why they happen that way:
When the Gear Position Sensor (GPS from here on out), which has 2 sensors in its housing, is not getting a signal from either of its sensors the SMG computer reverts to a fail safe shifting mode. The reason you only get R, 2, 5 and 6 is easy to understand once you look at the layout of the shift pattern on the 6 spd GETRAG. Here's a crude outline:

R-1-3-5
2-4-6

In the upper left you have reverse, with 2nd in the lower most left position, and 5 and 6 down at the other end. Since the transmission can't tell where the selector is at, it simply says "go all the way left and all the way down" or "all the way right and all the way up" Simple enough right?

Recommended tools required:
Set of sockets (metric obviously)
Ratcheting wrenches are also highly recommended.
10mm inverted torx (a 10mm socket will work if you're in a pinch)
4mm Allen Wrench
Jack and jack stands.

Instructions to follow in the next post.
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Old 10-09-2011, 09:56 AM   #2
roadtrip1098
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Join Date: Aug 2011
Location: Winslow, ME
Posts: 351
My Ride: 04 M3 SMG LSB
Step one: Jack up your car securely.... My driveway does not support jacking a car up very safely, so here's what I ended up with:



You will need to raise the rear tires as well in order to spin the drive shaft - we'll get to that later though.

Many will recommend disconnecting the battery, DON'T disconnect the battery, you need power to the SMG pump in order to shift back and forth between N and 2 - again for removing the drive shaft.

Step 2: Getting straight to work, start taking off the skid plates around the transmission (there are 2 plastic skid plates that should be removed)

Step 3: Exhaust removal. I took out the whole section between the headers and the axle back. Here's what I'm talking about***********:



You will need to take out the V shaped brace under there and the two chassis braces (should be pretty obvious when you're under there as one of the braces has exhaust supports on it.

Step 4: The heat shield in the above picture also comes out.

Step 5: Here's what you're looking at:



The part you want to replace is above the drive shaft, so start working on the 3 nuts and bolts holding it to the vibration dampener. Also un-bolt the drive shaft support bearing. You do not need to disconnect the drive shaft from the differential.

Here's where the GPS plugs in:




Be careful with the wires getting them around SMG lines.

Step 6: Use your little midget hands to get a 4mm allen wrench up onto the bottom allen screw of the GPS - Like this:



Step 7: Now you may have already tried and failed at getting the top bolt out - that's what you get for not reading ahead. Take your allen wrench and cut about an inch off the long side and then put it into a vice and bend it like so:





Now go try again, and yes it is still a pain, but at least it will be possible.

Step 8: when you have gotten the ten thousandth thread to finally let go, the GPS will slide out fairly easily, like so:



The new one pops in the same way, you may feel a little click. Put in the bottom allen screw first. Make sure it's tight enough to not move. Now go click your key on and shift to N, then back into gear. If the Cog light is off and your tranny shifts to first I have some good news.

Finish putting everything back together and have fun!
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Old 10-09-2011, 07:13 PM   #3
vstyle09
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awesome man thanks for the diy
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Old 10-09-2011, 09:16 PM   #4
kevblah
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Great DIY!
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Old 10-10-2011, 05:47 PM   #5
roadtrip1098
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My Ride: 04 M3 SMG LSB
Glad you guys like it... Hopefully it will save some of you some cash. Also did a Water pump DIY, but there seem to be plenty of people out there that are capable of doing that. As for SMG stuff, if you ever have an issue with yours, PM me I read the hundred and some odd page technical manual from BMW on it and have a pretty good handle on troubleshooting them.
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Old 10-27-2011, 06:13 PM   #6
Joemc
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Join Date: Oct 2011
Location: Dublin. Ireland
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My Ride: E46 M3 SMG
Your a god bro next time your in Dublin the beer is on me. I owe u. Gonna it this part tomorrow
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Old 10-30-2011, 12:35 AM   #7
twboy1999
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thx for the diy
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Old 11-19-2011, 12:21 PM   #8
Blue323ci
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Roadtrip do you have that 1000 page smg manual in a pdf format?
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Old 02-05-2012, 12:18 PM   #9
roadtrip1098
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Click Here for the SMG Manual This is the 40 page manual that covers most info. I'll see if I can wrestle up the ultra-long winded version for you though.
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Old 05-31-2012, 03:18 AM   #10
Brian_67
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very nice! thanks for the manual too.
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Old 06-02-2012, 01:52 PM   #11
Brian_67
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Any update on the longer version of the manual?
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Old 06-03-2012, 12:12 PM   #12
roadtrip1098
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No luck as of yet. I have been shifting focus slightly to learning the GT1/DIS/SSS/PROGMAN stuff. If I come across it again I'll post it here.
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Old 06-03-2012, 03:57 PM   #13
BWOODM3
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Impressed. Thanks a lot, I am sure this will come handy for more to come.
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Old 06-04-2012, 03:14 AM   #14
2MCHM4U
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I needed this and wasnt even looking for it. Thanks!
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Old 07-24-2013, 12:19 PM   #15
msport1992
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Hey just had a look through your post here and you seem to know what your talking about with SMGs. Wondered if you could help me. I have a 325ci m sport 5spd SMG/SSG. Basically I have been having this re occouring problem where I will be driving and there will be a 4/5 second delay between gear changes and clutch will slip on pull away no cog light nothing then after finishing the journey car goes off leave it a while drive again its perfect :/ weird eh?Few places have said the clutch but if its the clutch how can it be perfectone minute then terrible the next? Seems to be after long drives or if I have others in the car when im on my own just driving to work and home its fine.

Please any help or advice would be brilliant!

Thanks
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