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  #1  
Old 03-18-2022, 09:14 PM
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Speedometer on w140: Where does it get it's signal?

The speedometer on my 93' 300sd is not currently working. Does anyone know where the sensor for is on w140's?

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-E300d '99 350k
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-F250 '96 7.3
-Dodge Ram 12V
-E320 '95 200k
-E320 Wagon 1994 155k
-300d Turbo '87 187k miles
-E320 1994 200k
-300d Turbo '84 245k (sold to Dan62)
-300d Turbo '84 180k
-300sd '80 300k
-7.3 Powerstroke Diesel 15P Van 500k+ miles
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Tom's Imports of Columbia MO Ruined the IP in changing leaky delivery valve O-Rings - Refused to stand behind his work. Mid-MO MB drivers-AVOID Tom's.
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Old 03-18-2022, 10:26 PM
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Quote:
Originally Posted by 777funk View Post
The speedometer on my 93' 300sd is not currently working. Does anyone know where the sensor for is on w140's?
Should use the left front speed sensor. L6/1 is the LF sensor, A1 is the speedometer.

Do you have a blink box to read codes? Do you know how to read codes?

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Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (116k)
1991 350SD (206k)
1991 300D (228k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (267k)

Past Diesels:
1983 300D (228K), 1985 300D (233K), 1993 300D 2.5T (338k), 1993 300SD (291k)
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  #3  
Old 03-18-2022, 10:50 PM
777funk's Avatar
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Join Date: Dec 2006
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Quote:
Originally Posted by JHZR2 View Post
Should use the left front speed sensor. L6/1 is the LF sensor, A1 is the speedometer.

Do you have a blink box to read codes? Do you know how to read codes?


Thanks. I made one of those years ago for an e320. Will check into it.
__________________
-E300d '99 350k
-Suburban '93 220k
-TDI Jetta '03 350k
Sold
-F250 '96 7.3
-Dodge Ram 12V
-E320 '95 200k
-E320 Wagon 1994 155k
-300d Turbo '87 187k miles
-E320 1994 200k
-300d Turbo '84 245k (sold to Dan62)
-300d Turbo '84 180k
-300sd '80 300k
-7.3 Powerstroke Diesel 15P Van 500k+ miles
-190d '89 Non Turbo 2.5 5cyl 240k (my first MB)
Tom's Imports of Columbia MO Ruined the IP in changing leaky delivery valve O-Rings - Refused to stand behind his work. Mid-MO MB drivers-AVOID Tom's.
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  #4  
Old 03-18-2022, 11:36 PM
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Join Date: Jan 2002
Location: New Jersey
Posts: 5,415
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Originally Posted by 777funk View Post
Thanks. I made one of those years ago for an e320. Will check into it.
Same thing should work in the 38 pin connector in the w140. Just figure out which pin is for ABS and count the flashes. There are diagnostic guides available online.

I’m guessing you’ll see that the speed sensor is failed.

The clusters on these cars are also known to go bad…

__________________
Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (116k)
1991 350SD (206k)
1991 300D (228k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (267k)

Past Diesels:
1983 300D (228K), 1985 300D (233K), 1993 300D 2.5T (338k), 1993 300SD (291k)
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