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  #1  
Old 07-29-2010, 06:14 PM
JamesDean's Avatar
Electrical Engineer
 
Join Date: Apr 2005
Location: NE Ohio
Posts: 5,034
90' 560SEL speedometer problems

Hello everyone,

My buddy just got a 560SEL. The speedo doesnt work. I tried two different clusters and it would just seem that there is no signal coming up from..wherever it originates.

He sent it to the shop as it needed some other things worked on. We had them look at it and they said that the transmission was worked on and something was put in wrong inside the transmission.

I've been looking through all my documents for the location of the pickup sensor. Originally I thought it was actually on the differential however the FSM's Electrical Troubleshooting Manual tells me is on the the transmission, left side rear.

I also have the 722.3 transmission manual and haven't found any mention of the pickup sensor.

Any one have any ideas?

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82 300SD 145k
82 300SD 265k
87 420SEL 230k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
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93 190E 3.0 235k
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  #2  
Old 07-30-2010, 06:39 PM
david s poole
 
Join Date: Mar 2005
Location: dallas
Posts: 1,822
quite often it's the pickup sensor that goes bad requiring a new harness.which includes the sensor.
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David S Poole
European Performance
Dallas, TX
4696880422

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
http://www.w108.org/gallery/albums/A...1159.thumb.jpg
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  #3  
Old 07-30-2010, 07:49 PM
JamesDean's Avatar
Electrical Engineer
 
Join Date: Apr 2005
Location: NE Ohio
Posts: 5,034
david, you wouldnt happen to have a part number for the sensor/harness, I wasn't able to find one in the EPC
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out.
Check here for compatibility, diagnostics, and availability!

82 300SD 145k
82 300SD 265k
87 420SEL 230k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k
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  #4  
Old 07-31-2010, 10:56 AM
david s poole
 
Join Date: Mar 2005
Location: dallas
Posts: 1,822
it is a 126-540-46-13 hope this helps.
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David S Poole
European Performance
Dallas, TX
4696880422

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
http://www.w108.org/gallery/albums/A...1159.thumb.jpg
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  #5  
Old 07-31-2010, 11:43 AM
JamesDean's Avatar
Electrical Engineer
 
Join Date: Apr 2005
Location: NE Ohio
Posts: 5,034
thanks, hmm they dont give a number for the pickup sensor weird
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out.
Check here for compatibility, diagnostics, and availability!

82 300SD 145k
82 300SD 265k
87 420SEL 230k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k
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  #6  
Old 08-13-2010, 03:27 PM
JamesDean's Avatar
Electrical Engineer
 
Join Date: Apr 2005
Location: NE Ohio
Posts: 5,034
alright, so we finally picked up the car from the shop. $1150, new chain, both ball joints, fuel lines, fuel pump mounts, tie rods.

They said that something is wrong in the transmission, they said the sensor works fine. Does anyone have any idea whats might be up in the transmission?

I have two 722 manuals but I cant find anything that points to the speedo pickup...

I know the sensor is hall effect so somewhere theres a shaft with something on for the sensor to pick up...
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out.
Check here for compatibility, diagnostics, and availability!

82 300SD 145k
82 300SD 265k
87 420SEL 230k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k
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  #7  
Old 08-13-2010, 06:33 PM
david s poole
 
Join Date: Mar 2005
Location: dallas
Posts: 1,822
if the sensor is good that means that someone had the trans apart and didn't put the pcs back on the shaft in the correct order.this problem can be corrected by taking off the tailshaft housing and correcting the mistake.
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David S Poole
European Performance
Dallas, TX
4696880422

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
http://www.w108.org/gallery/albums/A...1159.thumb.jpg
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  #8  
Old 08-13-2010, 06:41 PM
JamesDean's Avatar
Electrical Engineer
 
Join Date: Apr 2005
Location: NE Ohio
Posts: 5,034
david, do you have any info on this procedure? diagrams? pictures? how difficult is this task?
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Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out.
Check here for compatibility, diagnostics, and availability!

82 300SD 145k
82 300SD 265k
87 420SEL 230k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k
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  #9  
Old 08-14-2010, 12:09 PM
david s poole
 
Join Date: Mar 2005
Location: dallas
Posts: 1,822
it is not difficult.remove crossmember,flex disc and let trans hang down.you will need 27mm deep socket to remove nut holding flange on rear shaft.there are about 7or8 13mm head bolts holding the tail shaft housing on to trans [of varying lengths].you will have to take out the parking pawl so take pictures or notes.be careful of the gasket where the housing joins to the trans body.look at how the various components are lined up on shaft and it should be obvious what is in the wrong place.the speedo will be a wheel with segments on it that is supposed to line up with hole where the sensor fits. NOW this could only have happened if the trans was taken apart so be very sure that the sensor is working before going to this much trouble.
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David S Poole
European Performance
Dallas, TX
4696880422

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
http://www.w108.org/gallery/albums/A...1159.thumb.jpg
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  #10  
Old 08-20-2010, 10:16 PM
JamesDean's Avatar
Electrical Engineer
 
Join Date: Apr 2005
Location: NE Ohio
Posts: 5,034
david,

I found this diagram, which part is the speedo wheel?



Hmmmm

Also found this mentioning electronic speedo:

__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out.
Check here for compatibility, diagnostics, and availability!

82 300SD 145k
82 300SD 265k
87 420SEL 230k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k
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  #11  
Old 08-21-2010, 04:47 PM
david s poole
 
Join Date: Mar 2005
Location: dallas
Posts: 1,822
it appears that you answered your own question with second set of pics.
__________________
David S Poole
European Performance
Dallas, TX
4696880422

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
http://www.w108.org/gallery/albums/A...1159.thumb.jpg
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  #12  
Old 08-21-2010, 05:39 PM
JamesDean's Avatar
Electrical Engineer
 
Join Date: Apr 2005
Location: NE Ohio
Posts: 5,034
So the sensor picks up on the parking lock gear? or the rotor atop the gear? Hm, I would think if the rotor was gear was installed wrong you wouldnt have park?
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out.
Check here for compatibility, diagnostics, and availability!

82 300SD 145k
82 300SD 265k
87 420SEL 230k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k
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  #13  
Old 09-02-2010, 01:24 AM
JamesDean's Avatar
Electrical Engineer
 
Join Date: Apr 2005
Location: NE Ohio
Posts: 5,034
FIXED.

X49/2 Connector. On driver side of center console by accel pedal. Houses a 7 pin connector for reverse lights and speedo. This was somehow pulled apart. Fixed the problem now speedo works, reverse light and cruise.

YAY no need to tear into transmission!

David, thanks for all your help. I am very glad to say that we didn't need to dive into it though

__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out.
Check here for compatibility, diagnostics, and availability!

82 300SD 145k
82 300SD 265k
87 420SEL 230k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k
Reply With Quote
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