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1991 300sl, 1993 Porsche 928 GTS, 1996 SL500, 1991 560sec, 1997 AMG C36
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182 Posts
Discussion Starter · #1 ·
Hi all,

We have a DD '96 500SL that has the hard, clunking downshift when coming to a stop. I think it's the 3-2 downshift as they don't drop into first. Lot's of threads on checking for the oil soaked module in the coffin, but our Star DVD has it placed under the passenger footwell. Disassembled and found it there - oil free. I replaced the leaking connector plug when purchased 2 years ago. Question, is there more than one transmission control module? Am I looking for the wrong module? I hate ripping the car apart for fun. Collateral damage is too costly.

Cheers, Phendriks
 

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Registered
1991 300sl, 1993 Porsche 928 GTS, 1996 SL500, 1991 560sec, 1997 AMG C36
Joined
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182 Posts
Discussion Starter · #3 ·
Sorry, didn't record it at the time. Think I confirmed part number was a TCM. It was dry, seem to remember the plugs are bottom mounted. I would assume oil would leak out as mounted. So if there's no secondary module, next guess would be conductor plate - amirite?

Cheers, Phendriks
 

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2004 SL600; 2004 SL500;1996 SL600;2003 ML350; 1997 C280 Sport; 1987 190e 2.3 16v; 1986 190e 2.3 16V;
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746 Posts
EDIT - never mind, I found another post that explains it clearly.
Thanks for looking though!

Looking to check the TCM on he new to me 1996 SL600. Where is "Under the passenger footwell"? Anybody have a picture they could share?
Previous owner stated he changed the conductor plate and plug. HHT shows a speed fault. Assuming the condutor plate and plug were changed, I'd like to check for oil wicking before I jack up the car and replace the plate with a new MB plate and plug.
 

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2001 SL500
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1,006 Posts
EDIT - never mind, I found another post that explains it clearly.
Thanks for looking though!

Looking to check the TCM on he new to me 1996 SL600. Where is "Under the passenger footwell"? Anybody have a picture they could share?
Previous owner stated he changed the conductor plate and plug. HHT shows a speed fault. Assuming the condutor plate and plug were changed, I'd like to check for oil wicking before I jack up the car and replace the plate with a new MB plate and plug.
Check the tcm for fluid intrusion. May need a good spray down with electrical cleaner or maf cleaner. Also after verifying the tcm is all good, just clear the transmission fault code and see if it returns before replacing the plug and conductor plate (unless you know they’re aftermarket , then go right ahead)
 
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