2002 MB E320 - Another Tranny Issue - Page 8 - Mercedes-Benz Forum
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post #71 of 95 (permalink) Old 02-09-2019, 05:30 PM
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Quote:
Originally Posted by Smartchoice View Post
after the troubleshooting technician forgot to insert the 13 pin plug before test tun.....


hence these gifts

Fault codes
Confirmed and stored codes (Mode 03)
ECU
DTC
Description
10
P0753
Shift Solenoid "A" Electrical
10
P0758
Shift Solenoid "B" Electrical
10
P0763
Shift Solenoid "C" Electrical
10
P0743
Torque Converter Clutch Solenoid Circuit Electrical
10
P0715
Turbine/Input Shaft Speed Sensor "A" Circuit

what do you advise?



cc mrboca
Get the mechanic to reset the codes after the 13 pin plug is properly inserted. Reset the codes at the TCM and then at the ECU. Star the engine and drive for a while and check for new codes.
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post #72 of 95 (permalink) Old 02-09-2019, 10:38 PM
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Those solenoids are on conductor plate and that explains if the 13 pin connector was not connected, on the other hand I personally donít have such experience if the car would start without the connection between TCM and the tranny. I never tried it, I even disconnected the battery when I took my TCM out to clean it.
Like mrboca said, get everything corrected, clear the codes and take it for a drive, if any warnings come back then post it here.
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post #73 of 95 (permalink) Old 02-10-2019, 10:12 AM
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Quote:
Originally Posted by 01blackhawk View Post
Those solenoids are on conductor plate and that explains if the 13 pin connector was not connected, on the other hand I personally donít have such experience if the car would start without the connection between TCM and the tranny. I never tried it, I even disconnected the battery when I took my TCM out to clean it.
Like mrboca said, get everything corrected, clear the codes and take it for a drive, if any warnings come back then post it here.
An update:
Got an Autel MaxiSys to clear the error codes, then I test drove,
OBSERVATIONS:
#1. TRANSMISSION SHIFTING WAS AS SMOOTH AS A REDHOT KNIFE GOING THROUGH BUTTER.....
#2. SHIFTING WAS ALMOST NOT NOTICEABLE
#3. AFTER ABOUT 6KM THE IT GOT HOOKED IN GEAR 3. (SOFT LIMP MODE) A RESTART CLEARED IT.
#4. A SCAN AFTERWARDS REVEALED P0730 AND CODE 147 (GEAR SLIPPING OR SIGNAL IMPLAUSIBLE).... WITH CHECK ENGINE LIGHT ON OCCASIONALLY...

ANY FURTHER IDEA?

CC MRBOCA....

THANKS ALL SO FAR I AM INDEED GRATEFUL.... BUT THERE IS STILL AN ISSUE WITH THE TRANNY

NOTE: I OPENED THE GEAR SUMP YESTERDAY AND DID A THREE QUART OIL CHANGE, BOTTOM PLATE HAD SOME METAL SHAVINGS
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post #74 of 95 (permalink) Old 02-10-2019, 10:19 AM
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Change the ATF filter with a genuine MB one, making sure it is properly inserted and mounted.

Then, make sure the ATF levels are correct.
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post #75 of 95 (permalink) Old 02-14-2019, 11:35 AM
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After 2 weeks of trouble free driving I'm unfortunately back with the same problem.

[To recap, I was not getting any drive with the regular error codes. Changed ATF and filter and problem went away... until today.]

This time however I lost drive while I was actively driving down the street. A full shutdown/restart solved the problem for a few minutes. I'm also hearing the whine from below the centre console again. It seems to get worse and loss of drive seems to happen after the car has warmed up (5-10 minutes driving). I simply drove it straight to my mechanic today when I started having issues.

A few questions:

1. Why would a fluid and filter change solve the problems completely for a couple of weeks?

2. There's no oil in the TCU, but the conductor plate and connector have never been changed (262 000km). If those parts are failing would they display this kind of on again/off again behaviour with the transmission?

3. When I spoke with my mechanic last time about changing the conductor plate he said that it's not just a straight switch out job. That it'd need to be "reprogrammed." I've never heard anyone here talk about having to "reprogram" the transmission after replacing the plate and connector, or did I miss something?

Thanks again for any and all help. These forums are awesome.

BTW - a final note that may or may not be related: the original transmission failure and this one coincided almost exactly with major snowstorms and rough driving in my area (ESP kicking in very often).
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post #76 of 95 (permalink) Old 02-14-2019, 12:15 PM
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No check engine light or display panel alerts? Let’s see what others say but I’d replace the connector for the heck of it and think seriously about a conductor plate.

The need to “reprogram” is a 722.9 thing, not a 722.6 thing.

Sixto
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02 C320 wagon
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post #77 of 95 (permalink) Old 02-14-2019, 12:37 PM
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You need to obtain fault codes from the transmission and other modules like the ESP, ECM by scanning them and post here. Not every code translates to an OBD2 code, so no CEL or no OBD2 code does not mean there are no codes (especially CAN bus related codes). It may not be a TCM issue at all. It could be related to the vehicle speed sensors (VSS) which are essential for the TCM gear control process. The ESP will complain about it and that is why you may be seeing the ESP light coming on.

The conductor plate issues, adapter issues, TCM issues almost always end up in electrical limp mode. But yours is a mechanical limp mode which is reset after key off and on. In electrical limp mode, you end up getting the the gear stuck at 2nd or 3rd gear right from the beginning.
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post #78 of 95 (permalink) Old 02-14-2019, 01:26 PM
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Thanks again for your help.

I'm going to pick up the car and hopefully get it home without too much trouble. I'll get the codes from my mechanic. This last time, today, the Check Engine Light did come on when I lost drive. That's why I drove it straight to the mechanic. He's convinced the clutches are shot and need a complete rebuild. But he also says the the transmission requires reprogramming if the conductor plate is replaced, so I think this might be getting too model specific for him. He's an awesome mechanic that has saved me thousands over the years, but he's not a Mercedes specialist.

I'll be looking into a nearby independent Mercedes garage nearby (Toronto).

As for the ESP light going on all the time: it was acting completely as expected given the conditions at the time (foot of snow and complete ice base). I just mentioned it because both transmission issues showed up under the exact same severe driving conditions 2 weeks apart.
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post #79 of 95 (permalink) Old 02-14-2019, 01:29 PM
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Also, that whining sound is very disconcerting.
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post #80 of 95 (permalink) Old 02-14-2019, 01:37 PM
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To me the whine is a warning to get off the road and to a safe place to wait. Better than no warning.

Sixto
98 E320s sedan and wagon
02 C320 wagon
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