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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 Wed, Dec-14-2016, 03:57:43 AM   #921
DJ RaMiN
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Default Re: SMG troubleshooting FAQ

Hey guys. I couldn't find any info on my issue. I've been getting the cog light every now and then and usually it goes away after a restart. Car shifts fine and no problems there. I don't think its a high temperature issue since it happens now in winter. Any thoughts would be appreciated.

Thanks.
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Old Thu, Jan-12-2017, 05:02:30 AM   #922
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Default Re: SMG troubleshooting FAQ

Heads up to those who have the cog light with no SMG symptoms:

Prior to my SMG-6MT swap, I had the SMG cog light go on with no driving symptoms at all. I was already planning on getting the swap done anyways. KAIV tested my SMG prior to doing the swap, and he found no other issue other than 'power supply" error.

Approx. 2 months earlier, I had issues with my radio randomly and intermittently shutting off for a few seconds and then coming back on. This radio issue gradually became more frequent and the shut offs became minutes. The car otherwise worked fine, i thought my radio was on the blink. Then my cog light went on.

KAIV discovered that my alternator was overcharging, at times up to 16 volts! Since I changed the alternator, my radio issues are gone. I am 99.9% certain that the over charging alternator also caused the "power supply" error since all other systems of my SMG checked out as A-OK.
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Old Wed, Jan-18-2017, 08:25:25 PM   #923
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Default Re: SMG troubleshooting FAQ

Just wanted to say thank you for posting this. I had the blinking light, my hood was open. duh!
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Old Wed, Jan-18-2017, 09:07:51 PM   #924
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Default Re: SMG troubleshooting FAQ

Quote:
Originally Posted by cncmastr View Post
Just wanted to say thank you for posting this. I had the blinking light, my hood was open. duh!
i've done several times
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Old Thu, Jan-19-2017, 05:54:36 AM   #925
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Default Re: SMG troubleshooting FAQ

Hey guys, While driving in S3 or Any manual mode, when im slowing down either it be slowly or aggressively there is a forward jerk while shifting down. Any ideas? I haven't scanned for any codes yet but will do soon. Also no SMG light etc on the dash.
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Old Thu, Jan-19-2017, 07:46:18 AM   #926
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Default Re: SMG troubleshooting FAQ

Quote:
Originally Posted by 0-60Motorsports View Post
Hey guys, While driving in S3 or Any manual mode, when im slowing down either it be slowly or aggressively there is a forward jerk while shifting down. Any ideas? I haven't scanned for any codes yet but will do soon. Also no SMG light etc on the dash.
My bet is on clutch adaptation. Engine rev matches before completely disengaging the clutch, which makes the car jerk forward.
Redo the clutch adaptation and see if it helps
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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)