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Old 01-31-2007, 03:34 PM
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Join Date: Jan 2007
Location: Atlanta
Posts: 8
ETC (TCU) Reset/Adaptation: 722.6xx

98 CLK 320, 722.607 trans, 145K
I have finished a valve body "rebuild" (which really only amounts to spring replacement, freedom of movement checks, and burr removal). Simple procedure - but frustrating due to resource limitations. MB techs no longer even open a valve body - they just replace, at +$2K. I learned this after losing several small bearings held inside the body and discovering that few techs at the dealer even knew they existed (no EPC#). My problem is that without the purchase of a Star diagnostic unit, there appears to be no way to clear the Transmission error codes (ECU flashing, or scanner clearing does not truly clear the ETC). I have a friend who works at a shop, and he has cleared the system several times for me with Star - but the adaptation procedures, coupled will all the updates I did in this process (conductor plate, plug o-rings, screens beneath solenoids, magnet, cleaning of all harness plugs, numerous other adjustments) will likely require several more resets before I get it right. I have to believe there is a way to reflash the ETC/TCU (I can do a manual re-readapt). I have read references to "pulling relevant fuses (?) " while the ignition is on, and to touching the pos/neg batt connectors (with the battery removed). Tried the cable connect - but no luck, and I am reluctant to pull fuses from a live system. I have a P0730 (implausible gear ratio), that shows up as pending upon every restart (see post: Diagnose/Repair P0730 on 722.6 - Mystery Fault ) - even before gear is engaged. I have done the usual multimeter pinout tests on the range rec. sensor, and on the ETC, with no errors. Does anyone know A diy method to truly reset the ETC. I have done all the typical procedures - scan tool clear, batt disconnect, tps reset (ignition key/accel pedal reset), and the HVAC head unit code clear methods). MB techs claim it can't be done - which only makes me want to try harder.

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Old 01-31-2007, 03:47 PM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
Clearing the trans adaptation requires a "HIGH END$$" scanner like AST, Baum, Autologic, Car-soft, or the dealer SDS.

None of the listed methods will clear the codes OR adaptations.
MERCEDES Benz Master Guild Technician (6 TIMES)
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Old 06-26-2008, 05:45 PM
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Join Date: Jun 2008
Posts: 1
MB Doc, 722.620 limp mode questions
You sound like you are well versed in the repair areas. I have a 97 722.620 which did a hard shift 2-3 or 3-4? at about 35mph and then quit shifting. It went into limp mode when I tried a restart. This trans has 75k as far as I know. I read on the possible problems online and the electrical connector leak looked like a good start. I found some oil in the first cavity after removing the plastic screw lock plug. There was oil on a couple of pins. Not all. I removed the oil and reassembled it. I read the OBD2 read outs and I got three error codes. po715, po720, and p1519. The first two are generic and are:
po715 is Input turbine speed sensor
po720 is Output turbine speed sensor, or the reverse of these two
p1519 is Dealer specific and I cannot read it.

I am looking for direction here. I can replace the electrical connector mid plug and the O rings in the area. I can change the fluid and get the dipstick or make one that has a level of 6.4 cm to be used at 80'C. I was inside a BMW Electrical 5 speed that I think was the same animal as this trans. I saw the selenoid bank etc. That one blew fluid out the top vent at sustained highway speeds. I am working in my garage. Getting the vehicle up high enough to make life easier is tough.
What is the setup? Pull the selenoids, then a electrical connector board (circuit board) and replace the board (removing a plastic molding projection to allow flush seat with the trans wall), check selenoids for light transmittal thru them, reassemble filter and pan. Refill with old strained or new fluid.

I have deoiled the electrial connector now. The codes are not reset. Should the vehicle shift when driven now or will the codes need to be reset before proper operation would be possible?
I would appreciate your time or leading me to someone who can help.

Thane in SE Florida

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