722.6 Transmission Refresh. DIY and questions. - PeachParts Mercedes-Benz Forum

97 SL320 · #1 09-19-2012, 08:07 PM

Another question, was your speedo still working even with the 0715 speed sensor code? I've got a 97 E320 parts car that stays in 2nd limp / CEL on. One time after start up it did shift fine but from the next key cycle it went into limp.

Another oddity is when the trans is stuck in 2nd,the dash mounted high beam indicator is on and there is a warning message on the driver info display. ( it is ABS or ASR , don't remember. ) The speedo works through all of this so it either gets a speed signal from the ABS sensors or the trans output shaft speed sensor is intermittent.

Somewhere I came across some info that these cars used a front ABS sensor to drive the speedo.

MEPEH · #2 09-19-2012, 08:55 PM

Quote:

Originally Posted by 97 SL320

Another question, was your speedo still working even with the 0715 speed sensor code? I've got a 97 E320 parts car that stays in 2nd limp / CEL on. One time after start up it did shift fine but from the next key cycle it went into limp.

Another oddity is when the trans is stuck in 2nd,the dash mounted high beam indicator is on and there is a warning message on the driver info display. ( it is ABS or ASR , don't remember. ) The speedo works through all of this so it either gets a speed signal from the ABS sensors or the trans output shaft speed sensor is intermittent.

Somewhere I came across some info that these cars used a front ABS sensor to drive the speedo.

Correct. Fron ABS Sensor dictates vehicle speed for the dash and ECU

The speed sensor P0715 is for transmission control purposes.

PLEASE REMEMBER: Once the Limp Mode 2nd Gear is engaged, the Trouble Code will stay in the Transmission Module until erased with a MB STar Tool.

Generic OBD Scanners WILL NOT ERASE TRANSMISSION CODES
Disconnecting Battery, Sleeping in the car or dancing around it will not help either

(Sorry for the caps, i've been researching this topic a lot and people rarely mention it. Lots of people get convinced to get a new TCU for 800$ rather then erase the trouble code in the original one)

Gilly · #3 09-20-2012, 01:19 AM

Magnetic pad for in oil pan, i don't think your 1998 will have it, I have one around here I can grab the PN off of if you need it.

The new conductor plate should come with the covers for the solenoids, be sure to install these, they are NOT just for shipping purposes, they were added in later in production and should be there, again your 1998 might not have the covers originally. If you don't have the covers with the new conductor plate I would get them before putting the valve body back in.

MEPEH · #4 09-20-2012, 01:23 AM

Quote:

Originally Posted by Gilly

Magnetic pad for in oil pan, i don't think your 1998 will have it, I have one around here I can grab the PN off of if you need it.

The new conductor plate should come with the covers for the solenoids, be sure to install these, they are NOT just for shipping purposes, they were added in later in production and should be there, again your 1998 might not have the covers originally. If you don't have the covers with the new conductor plate I would get them before putting the valve body back in.

Yes, please. Can i have the part number for the magnets ?
Everyone mentions it but i haven't found any p/n

Appreciate your help

MEPEH · #5 09-20-2012, 12:57 PM

Quote:

Originally Posted by Gilly

Magnetic pad for in oil pan, i don't think your 1998 will have it, I have one around here I can grab the PN off of if you need it.

The new conductor plate should come with the covers for the solenoids, be sure to install these, they are NOT just for shipping purposes, they were added in later in production and should be there, again your 1998 might not have the covers originally. If you don't have the covers with the new conductor plate I would get them before putting the valve body back in.

Solenoid Covers. Are you talking about 459 and 459B in this diagram ?
http://www.daccoinc.com/pdfs/catalogs/MERCEDES_722-6.pdf