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 01-04-2005, 01:51 PM
Member
 
Join Date: Apr 2001
Posts: 86
1990 129 no 5th shift

Probably should have put this here rather then SL thread, sorry.

I have a '90 129 that won't shift into 5th gear. I took it to Mercedes and had it checked out and they spent a number of hours on it and came up with a bad HSG mod.

Because I have a repair shop and we're over 2 hours away from the dealer I ordered and installed new HSG with no change. This problem has been going on for a few years now so we reinstalled the original HSG and found a code 9, road tested the car with this controler and there was a 3-5 shift skipping 4th.

While we working on this car in the past, when the new HGS controler was installed we found a bad connection on the trans overload protection switch so I figured the old controler still had that code in it so I cleared the codes in all the mods and road tested.

Back to square one, no 5th gear and no codes in any of the mods. I don't understand why it doesn't set a code when it's not shifting into 5th, Anyone have any ideas?

Thanks,

Ron
Reply With Quote
  #2  
Old 01-04-2005, 09:59 PM
C32AMG's Avatar
Registered User
 
Join Date: Mar 2004
Location: new york/orange county
Posts: 639
What else was changed, done to solve this problem? Do you no 5th or no 4th
Reply With Quote
  #3  
Old 01-05-2005, 08:27 AM
Member
 
Join Date: Apr 2001
Posts: 86
Nothing has been replaced other then the HGS mod. I dropped the pan and cleaned the sol. but didn't really find anything there. Repaired a connection on the trans overload switch. Checked the over voltage relay, this one has a fuse in it and it has never been blown. Checked the function of the switch on the shifter and that is working properly.

I made a pulse tester and that is what I'm using to get the codes. I can access the MAS, EZL both of which have a list of codes in alldata but I couldn't find a list on the HGS mod. I used pin 14 for the MAS, 8 I think for the EZL and 13 for the HGS. The code 9 I pulled from the HGS I thought was the trans overload switch but I'm not sure of that because I couldn't find an actual list for the HGS.

Not that long ago when driving the car with the new HGS installed the car shifted perfectly for about 50 miles so this leeds me to believe that it is a wiring/connection issue rather then a transmission fault. I've checked the vac lines and found no problems.

My understanding of the system is that the controler looks for load, RPM's and the position of the shifter switch. All things being right it is suppose to shift into 5th.
Reply With Quote
  #4  
Old 01-05-2005, 08:37 AM
Pete Geither's Avatar
Half Fast Moderator
 
Join Date: Feb 2002
Location: Western Pa.
Posts: 2,417
I never knew the 90 SL had a 5th gear. My 95 only has 4.
__________________
95 SL500 Smoke Silver, Parchment 64K
07 E350 4matic Station Wagon White 34K
02 E320 4Matic Silver/grey 80K
05 F150 Silver 44K
Reply With Quote
  #5  
Old 01-05-2005, 08:33 PM
Registered User
 
Join Date: Jul 2000
Posts: 638
5 sp auto tranny mod year 1990? or 95?

I thought the 5 speed (electronic shifting) debuted in model year 1995 on the R-129 series
Reply With Quote
  #6  
Old 01-05-2005, 09:13 PM
Pete Geither's Avatar
Half Fast Moderator
 
Join Date: Feb 2002
Location: Western Pa.
Posts: 2,417
Quote:
Originally Posted by Kebowers
I thought the 5 speed (electronic shifting) debuted in model year 1995 on the R-129 series
Mine only has 4,,,,, but maybe should have 5. By God this thing may do 190 miles per hour if it ever hits 5th gear !!!
__________________
95 SL500 Smoke Silver, Parchment 64K
07 E350 4matic Station Wagon White 34K
02 E320 4Matic Silver/grey 80K
05 F150 Silver 44K
Reply With Quote
  #7  
Old 01-05-2005, 10:38 PM
C32AMG's Avatar
Registered User
 
Join Date: Mar 2004
Location: new york/orange county
Posts: 639
Code #9 in the HGS is the valve block control valve (Y3/1y2) in the valve body Verify that the alternator is not under or over changing. Check the alternator

Output at the battery post with all accessories on including the engine running, lights, heater, etc. 13.4 to 14 volts =’s ok. If the volts are less than 13.1 the charging systems is marginal, then do a voltage drop test, the reading should be 0.00 to 0.10which means the ground is ok. If more volts are present you have a bad battery ground. Check and clean the ground wires W1 main ground behind the instrument cluster, W16/2 and W16 on the firewall. Clean the connector contacts on the throttle potentiometer (TPS)

Clear the code, then drive the car at about 56MPH in position “4” release the gas pedal and immediately move the lever into the “D” position, the transmission should shift in to 5th. Then select “4” the transmission should down shift to 4th gear. Check for codes

Let’s verify we have no 5th gear. At 62MPH with a 3.69 rear “3” = 4300rpm, “4” = 3000rpm, “D/ 5th” =2200rpms. With a 3.46 rear “3” =4000 “4” = 2800 and “5” = 2100rpms.


Make sure you have the right HGS for that model car.

The 722.5 was an option.
Reply With Quote
  #8  
Old 01-07-2005, 03:59 PM
Member
 
Join Date: Apr 2001
Posts: 86
We've checked all the grounds, voltage drop, does not go into 5th, charging system, new HGS from Mercedes using the VIN to order and there is no info in alldata as to the values coming into and leaving the mods. Is it possible that something is causing the controlers to fail when plugged in?

With everything we've checked it should shift into 5th but we're missing something. Anyone have a telephone number they want to give up so we can pick your brains in real time
Reply With Quote
  #9  
Old 01-09-2005, 12:11 PM
C32AMG's Avatar
Registered User
 
Join Date: Mar 2004
Location: new york/orange county
Posts: 639
Is it possible that something is causing the controlers to fail when plugged in?


The Over Voltage Protection relay should protect the controllers. You should always disconnect the battery and discharge any static electricity by grounding yourself before disconnecting/connecting any controller.

I should have ask this question before, did the transmission ever shift into 5th gear. If the transmission fluid and pan are clean, no internal problem; then I would change the control valve for 5th gear (Y3/1y3) and the throttle valve switch (S29/4) even with no code these sensors can fail mechanically. The HGS did have an Y3/1Y3 code



The TCM / HGS receives the following electrical signals

Voltage supply, over voltage protection relay powers the TCM (HGS)
Engine speed; EZL / AKR control unit, TN signal
Load input: EZL/ AKR control unit. Manifold vacuum and DI control module
Throttle position: Throttle position switch: S29/4
Vehicle speed; Out put shaft on Trans/ speedometer. Digital and mechanical Speedo/ wheel sensor.
D contact switch: Shift lever in “D” position
Control valve: Valve body, pulse modulated



Email me or post your fax number and I will send you the diagnostic pin chart to diagnose the complete systems, plus fault codes for the MAS, EZL/AKR and the HGS.


If you have any question email a contact number and I will call you back

mastertech@mastertechtrans.com shop

928euro@mastertechtrans.com home
Reply With Quote
  #10  
Old 02-15-2009, 07:40 AM
Registered User
 
Join Date: Nov 2008
Posts: 7
Quote:
Originally Posted by C32AMG View Post



Email me or post your fax number and I will send you the diagnostic pin chart to diagnose the complete systems, plus fault codes for the MAS, EZL/AKR and the HGS.


If you have any question email a contact number and I will call you back

mastertech@mastertechtrans.com shop

928euro@mastertechtrans.com home
Sorry
I have the same problem with my w124 E320 1994

If you can pls send It to my email

anas2912@hotmail.com
Reply With Quote
  #11  
Old 08-18-2009, 03:44 PM
Registered User
 
Join Date: Aug 2000
Location: Orlando FL
Posts: 41
Hi

Can you please e-mail the diagnostic pin chart , I have a problem with my 300SL 1992 .
Only first and the second gear works , won't shift into 3-4 or 5th gear and the speedometer doesn't work .
Thank you .
Peter
pkurek@cfl.rr.com
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 08:33 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page