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.
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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)