Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 05-10-2010, 09:10 PM
Registered User
 
Join Date: Jul 2007
Posts: 100
WHY CAN I UPSHIFT, BUT NOT DOWNSHIFT?

sequentially.

for instance, i have this 2006 CL500. from D, if i downshift, the tranny goes to first gear.

yet, if from a stop, i take the gearing down to first gear, i can take it up a gear at a time.

in 2002, i rented a e320cdi in france. in that vehicle, i could upshift or downshift.

why is it that benz prevented downshifting in this tranny?

all ears.

Reply With Quote
  #2  
Old 05-11-2010, 08:15 AM
Moderator
 
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
It should do a manual downshift! AS long as the RPM's aren't too high.
__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator
Reply With Quote
  #3  
Old 05-11-2010, 12:35 PM
ILUVMILS's Avatar
Senior Member
 
Join Date: Sep 2002
Posts: 3,066
The MB tip-shift logic changed sometime around 2006-07 as I recall. On your CL, you do have the ability to manually downshift. Say for instance, that you're driving at 40mph, and the transmission is in 5th gear (the gear indicator will read "D"). Tapping the shifter once to the left will cause the transmission to shift into 4th gear, and the indicator will read "4". In other words, the transmission will shift one gear lower than the gear it's currently in. Try it, you'll see. The earlier MB's allowed the driver to shift down one gear at a time, regardless of the current gear.
Reply With Quote
  #4  
Old 05-11-2010, 10:22 PM
Registered User
 
Join Date: Jul 2007
Posts: 100
well, that has not been my experience.

this 2006 cl500 has a 7 speed tranny.

if you are in D, and move the lever into downshift, it goes into 1.

so, if you are in twisty bits, you cannot downshift.

you can stop. move the lever for a downshift to 1. then start to drive and upshift.

and this is how the owner's manual describes the functioning of this tranny by the way.

and i have wondered, did m-b do this so as to prevent the breakage of trannys?

i lost the first one at approx 30,000 miles. at 35mph in D. thank god for a warranty. but i wonder what it would have been like a few minutes earlier cruising up the interstate at 85mph.

i think that would have been way too exciting.
Reply With Quote
  #5  
Old 05-12-2010, 12:24 PM
ILUVMILS's Avatar
Senior Member
 
Join Date: Sep 2002
Posts: 3,066
Manually downshifting while stationary in "D", will result in the transmission shifting into, and staying in 1st gear, until manually upshifting or reaching near red-line. If you're saying that manually downshifting results in the transmission going into 1st gear, even if the car is moving (in 3rd gear or higher) there's something wrong. Have you actually tried manually downshifting while driving in 3rd gear or higher?

Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 02:33 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page