S600 ETA relearn; not a stupid question - PeachParts Mercedes-Benz Forum

lesrrt · #1 09-22-2007, 05:45 PM

I am almost finished with my 95 S600 t- chain replacement. Also rewired the ETA secondary to the usual wire rot. Replaced the FI harness as well as with lenghts of MAF sensor wire too. When I initially fired the engine, I later discovered the car was in LH mode.: ASR lit. What would be the proper procedure for resetting the computer? How long do I have to let the ETA relearn with the ign on, engine off. BTW, when I initially fired the motor, the car was on jack stands. I now know before I try this again, the codes will need to be reset. Bouhgt a 38 pin -to-obd 11 conn for my scan tool. Will this read the codes and then erase them even though the engine mng. sys is a hybrid of obd1and obd11..? Also, the car has the led blinker set-up too. I do know how to do it this way via Jim F's page. Thanks BTW, your knowledge is golden. Is there an extra step with respect to depressing the accelerator in conjuction with the key on, engine off..?
One more thing: When the motor fired, it leaked coolant in the bach of the motor on the pass side, opposite the 4-way h20 valve i am aware of. It seems when the engine got to temp, the leak seemed to stop. Could this be a head gasket, or....some kind of check valve that has "BB" apparatus to let air pockets escape?. I noticed something like this net to the alt/ recir. pump mount. Is head gasket failure comman with the M120 ? Prior to tear down, the car ran great and no CE light or coolant leaking. Is there something I did or did not do. Any input would be greatly appreciated

mbdoc · #2 09-24-2007, 08:02 AM

The lifting hooks at the rear of the engine have o-rings & are prone to leak after removing the intake.

You would need a analog "pulse" testor to read & erase codes.

JimF · #3 09-24-2007, 10:34 AM

Quote:

Originally Posted by lesrrt

I am almost finished with my 95 S600 t- chain replacement. Also rewired the ETA secondary to the usual wire rot. Replaced the FI harness as well as with lenghts of MAF sensor wire too. When I initially fired the engine, I later discovered the car was in LH mode.: ASR lit.

What would be the proper procedure for resetting the computer? How long do I have to let the ETA relearn with the ign on, engine off. BTW, when I initially fired the motor, the car was on jack stands.

When I replaced my ETA, the car didn't need to be reset. . . it fired up and there were no codes present.

I don't have a lot of experience with replacing ETAs, but I can say that the codes from the EA and DM were "ACTIVE" meaning that they were occuring "now". I couldn't reset them. This is important b/c if you find the same thing, then the ETA is still 'broke'. And you have two of them . . . aren't you lucky?

If you have the same thing, your ETA may NOT be fully repaired. In addition to the Reference Pot (Ref Pot), there's a electric 'transformer' that burns out. Maybe you need to have them tested to ensure that they are ok.

lesrrt · #4 09-24-2007, 07:44 PM

I just posted this on the other site: I got off the phone with a tech via 4mercedes.com. The rebuild eta and do extensive repairs on alot of 140's and 600 as well. Anyway, he mentioned the wire I used may be what the orig problem is. I would figure going larger would be the best..? Wrong. Because the it changes the reluctance of the potentiometer thus not giving the proper ohmic match. This makes sense. If I had used the 20-24 awg like Pete had mentioned, my units "may" haved worked. I have to send out the e-gas or EA module with both ETA's to FLa. and let them test all three unit in conjunction.
Where are the o-rings in the back. I never disturbed the hook ring when removing the plenum. . Funny, it leaked and then just stopped. I do know there are many coolant lines in the back. My car does have the pb with the led light. I thought this ended in 95...? Anyway, today I did pull codes 6 and 38. 6 is the ISC, so maybe the whole dam thing is open thus the LH mode. At least my t-chain and other work is unfaulted. Hey Jim! Did you go with 4mercedes.com for your eta..? And what did you pay if you don't mind me asking. Thanks!! PS. I also had a ham radio license in the ealy 80's KA3KWX was my # Man, I can still remember it. Was also RETS educated in Pa at the time

JimF · #5 09-24-2007, 09:57 PM

Quote:

Originally Posted by lesrrt

I got off the phone with a tech via 4mercedes.com. I have to send out the e-gas or EA module with both ETA's to FLa. and let them test all three unit in conjunction.

I need to send some data to you (via email) that you should "consider" before doing ANYTHING!! You could loose you

JimF · #6 09-24-2007, 10:01 PM

Quote:

Originally Posted by lesrrt

Anyway, today I did pull codes 6 and 38. 6 is the ISC, so maybe the whole dam thing is open thus the LH mode.

DTC #6 is the infamous "ISC faulty" and that usually means that an ETA is bad. . . but it could be a number of other things.

Quote:

Originally Posted by lesrrt

Hey Jim! Did you go with 4mercedes.com for your eta..? And what did you pay if you don't mind me asking. Thanks!!

No, I used Beckmann . . . highly recommend them! I bought a new one at 'cost' through my tech and then had the one that was removed (a VDO unit) rebuilt at Beckmann for around $650 or so quite some time ago. Still in the box . . . no I do not want to sell it!

Quote:

Originally Posted by lesrrt

PS. I also had a ham radio license in the ealy 80's KA3KWX was my # Man, I can still remember it. Was also RETS educated in Pa at the time

I'm still active although I have no antennas on the tower at present. Plan on putting up a custom one in the future.