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Faults, Fixes and DIY Please share your experience and knowledge with other members by contributing your own DIY, or by helping another member find the elusive fix!


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Old Sat, Jul-21-2018, 03:57:48 PM   #501
JamesSJ1
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Default Re: DIY: Resistor Mod To Cure Summertime SMG Blues

Sorry to drag up an old thread, but I've been getting P1717 code intermittently for the past week or so. INPA code only showed "177 - MIL-Extern-Info" with a few other things in German that essentially translate to unknown sporadic error.

For the first time ever, car even popped out of gear on the freeway, one of the hottest days of the year after some slower surface street and freeway driving, but still only ~90 degrees. A few times the yellow cog came up it was only ~80 degrees outside and I hadn't been in traffic, so wondering how to check other things.

I have INPA and DIS working...so what tests should I run or measurements should I look at to help diagnose this to accumulator, motor, salmon or resistor mod?

- I have NOT done the resistor mod, but plan to after checking accumulator.
- Salmon relay was replaced around 55k as preventative after getting a yellow cog but nothing else. Currently at 76k miles.
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Old Sat, Jul-21-2018, 05:17:36 PM   #502
SteveEvans
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Default Re: DIY: Resistor Mod To Cure Summertime SMG Blues

With the car stationary and engine running with INPA connected and on the SMG digital display which shows when the pump is running, keep changing between 1st and 2nd. You should get about 5 changes before the pump runs. Then time how long the pump runs. Should be around 6 seconds. If it’s much less it’s your accumulator. Much more it’s your pump motor. If around 6 then the resistor mod will work for you. You can do this without INPA; it just makes it easier.

Steve
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Old Sat, Jul-21-2018, 06:46:21 PM   #503
JamesSJ1
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Default Re: DIY: Resistor Mod To Cure Summertime SMG Blues

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Originally Posted by SteveEvans View Post
With the car stationary and engine running with INPA connected and on the SMG digital display which shows when the pump is running, keep changing between 1st and 2nd. You should get about 5 changes before the pump runs. Then time how long the pump runs. Should be around 6 seconds. If it’s much less it’s your accumulator. Much more it’s your pump motor. If around 6 then the resistor mod will work for you. You can do this without INPA; it just makes it easier.

Steve
Thanks! Hooked up INPA and ran the SMG tests which also reset adaptations. No errors reported. Did some videos a few times and double checked them after with a timer.

Started car and let it idle for a few minutes while I looked over INPA gauges. With hydraulic temp at only 37c (outdoor temp 77f) it would accumulate pressure from about 49 - 69 bar, and watched for hydraulic pump cycle on the digital display and got only 4 seconds.

Took a quick drive around, came back and hydraulic temp was up to 57c. Pressure would run from 49-73 bar, and counted it just short of 6 seconds. Watched the video with a stopwatch and got 5.7 seconds, so looks like that is okay.

Seems like I'm good to go with a resistor mod.

Last edited by JamesSJ1; Sun, Jul-22-2018 at 11:38:22 PM.
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Old Fri, Jul-12-2019, 06:22:46 PM   #504
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Default Re: DIY: Resistor Mod To Cure Summertime SMG Blues

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Originally Posted by SteveEvans View Post
With the car stationary and engine running with INPA connected and on the SMG digital display which shows when the pump is running, keep changing between 1st and 2nd. You should get about 5 changes before the pump runs. Then time how long the pump runs. Should be around 6 seconds. If it’s much less it’s your accumulator. Much more it’s your pump motor. If around 6 then the resistor mod will work for you. You can do this without INPA; it just makes it easier.

Steve
When I have INPA loaded up and I'm watching the analog values for the SMG system.... I'm looking at the hydraulic pressure in bar.

whenever the system pressurizes it only goes it to about maybe 63 bar max immediately starts falling back down on its own and levels out to around 57 to 58 bar and then steadily drops down on its own without even shifting anything and gets as low as 48 bar. If I shipped between 1 and 2 gears while at 47 to 48 bar the system starts pressurizing after 1 to 2 shifts. When you system pressurizes to about 63 bar which is the max it ever gets to and I immediately start shifting between first and second gear I can get about five six shifts out of it before it drops down to 46 bar and start pressurizing again. But I have to do that immediately. if I let the system pressurize and don't do any shifting in the pressure drops all the way back down to 47 bar and it'll pressurize on its own so it looks like the system is losing pressure if I'm watching the numbers.

If the system pressurizes the max should get up to 70 bar right? And it should hold if I do no shift right? so the fact that it pressurizes and just drops all the way back down to 46 or 47 bar after a few minutes on its own with no shifting means I have a leak or something else is wrong correct?

Because currently my system only takes about 4 seconds to pressurize from 47 bar to 63 bar but it always falls back down on its own with no shifting all the way back down to 47 bar and pressurizes back on its own.

Right now I'm having the issue of the car popping out of gear with no cog light and no error codes.


Edit I was wrong, I consistently get 2 ghost codes in the SMG computer:

25[037] Shift path (gear) position sensor evaluation
24[036]Selector angle (ww) position sensor evaluation

The always show as ghost pending codes never full codes but the do reappear after I have an instance of popping out of gear.
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Last edited by nextelbuddy1; Fri, Jul-12-2019 at 10:22:29 PM.
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Old Sat, Jul-13-2019, 12:15:50 AM   #505
SteveEvans
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Default Re: DIY: Resistor Mod To Cure Summertime SMG Blues

If itís quick to lose pressure then a leak could cause that, but if it also pressurises quickly, thatís a sign of a fail(ed/ing) accumulator. Iíd have still expected full pressure to be achieved, but Iíve never witnessed a failing accumulator, so perhaps the ECU inhibits max pressure if it rises too fast?

To test it, see http://m3forum.net/m3forum//showthread.php?t=460248

Steve
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Discussing DIY: Resistor Mod To Cure Summertime SMG Blues in the Faults, Fixes and DIY Forum - Please share your experience and knowledge with other members by contributing your own DIY, or by helping another member find the elusive fix! at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)