Have been trying to figure out the surging problem on the 320 for awhile now and finally built the code reader and found code 11 showing up. Tn-signal at ECM. OK,,, what is that and is it a repair or replace. Harness has not been replaced AFAIK.

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95 SL500 Smoke Silver, Parchment 64K
07 E350 4matic Station Wagon White 34K
02 E320 4Matic Silver/grey 80K
05 F150 Silver 44K

Tn sig is not gotten with the code reader tool ..It is an emmisions DM code and gotten w/built-in LED/SW.

Where did you get the code from???

Got it with the code reader Arthur. No CE light has been on. Got eleven flashes on the Code Reader LED.

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95 SL500 Smoke Silver, Parchment 64K
07 E350 4matic Station Wagon White 34K
02 E320 4Matic Silver/grey 80K
05 F150 Silver 44K

Oh..
Well , I guess what I mean is ...if you used the built-in led/sw , you will get the codes from the DM..which would be a TN signal for a code 11.
But......
My question stems from the fact that you said you has built the code reader tool and used that..if that is the case , the tool is to go to the other modules on the Box [ pins 8 or 14] and if that is what you have done , then a code 11 is not a TN sig code.
Just making sure you realize this so you are not going in the wrong direction.

Here are the codes that correspond to both the Tool you made and the built-in led/sw ones ..as you can see , that is why I ask where you got that code from..

http://www.peachparts.com/shopforum/showthread.php?t=107630

If you are already aware of this , please just disregard my post.

OK Arthur,, this is what I did,,,, got 11 flashes off the reader on pin 14, and just went out and checked pin 8 and got 13 flashes. The reader sure is pretty anyhow,,, the flashing lights impressed the crap out of my wife.

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95 SL500 Smoke Silver, Parchment 64K
07 E350 4matic Station Wagon White 34K
02 E320 4Matic Silver/grey 80K
05 F150 Silver 44K

Yeah . Flashing Lights always work...I always wanted to build a whole wall of them that did nothing but amaze the observer.. a few wierd audios thrown in there too...


..anyway, as you can see , the tn sig would be a code from the DM module and not related to your problem Those DM codes are gotten from the built-in led [ N59 Emmissioms Module] and that is what brought my attention to your code/module error.

A code 13 on the HFM [ ecu] module means the 02 sensor is running at an upper rich limit, so I would look around for a vac leak ..might want to start at the front plastic vac line running across the front of engine. under the cover..they are notorious on 104s for breaking due to heat fatique.
The othe code from 14 means you have a CTP [ closed throttle position]sw that is not closing all the time ..I would look at the adjustment for this [ you want a little slack in the cable at idle] and I would lube the cable ...this is another common code/problem on 104 HFM/SFI systems ..

I would also go use the built-in reader just to see if any of that info has gotten back to the DM..it can have pending codes in there and not trigger a CE.