Got me a gasser,,, 400e 1992 but the ASR,,, - PeachParts Mercedes-Benz Forum

mespe · #1 08-17-2006, 04:03 PM

It has the dreaded ASR Limphome problem. The PO replaced the wire harness and then got frustrated with the ASR issue.

I've only had it for a day and haven't driven it, but it seems like the ASR comes on as soon as the car moves i.e. put the car in gear and the ASR light comes on. Sometimes immediately after starting it, the ASR light comes on.

I know how to defeat the ASR, but since I'll be driving this car in the Wintertime, I'd prefer to keep the ASR functional.

Are there any diagnostic procedures to figure out what the problem is? Anyone else have the ASR problem, what did you do to correct it?

Mileage 100684

Thanks

Marty

Larry Delor · #2 08-17-2006, 05:00 PM

Had the light go on one time, and it turned out to be a defective brake light switch.
Let's hope your trouble is as easy (and cheap!).

david s poole · #3 08-17-2006, 05:06 PM

larry is right should be brake light switch but........buy from dealer a/market ones are junk.david poole dallas tx.

mespe · #4 08-17-2006, 05:18 PM

WEll I think that I have confirmed that the ASR comes on when the car is put in gear. Apparantly it sometimes 'sticks' in memory and turns on immediately. I disconnected the battery and when I reconnected it, I let the car idle for 3-4 minutes, no ASR, then as soon as I put the car into gear (R) the ASR light came on. I also noticed that revving up the car in park causes teh ASR light to come on. hadn't happened the first rev, but maybe the 3rd or 4th.

Brake light switch? Wouldn't just pressing on the brake to move the gear selector the cause the light to come on?

Marty

david s poole · #5 08-17-2006, 06:05 PM

there are two circuits in the switch and one of them is open. david poole

deanyel · #6 08-17-2006, 06:34 PM

Quote:

Originally Posted by mespe

I know how to defeat the ASR, but since I'll be driving this car in the Wintertime, I'd prefer to keep the ASR functional.

If you know how to defeat ASR please tell us. I've searched these archives for hours, or maybe it was days, and came to the conclusion that it wasn't possible - just too many components involved.

mespe · #7 08-17-2006, 08:19 PM

To defeat ASR simply disconnect pins 25 35 and 37 on the ASR module.

I did this and the car's idle increased to 1200-1500 RPM while in park, but no surging of idle like when ASR is on.

If you need help locating the ASR module, ask.

What I'm trying to do is figure out if the 1500RPM is OK, or did I do something wrong. Also, I didn;t notice any change in performance between ASR defeated, and ASR on.

Does the 400e get really sluggish when the ASR light is on? I've only driven the car a couple hundred feet, as I still don't have tags on it.

Marty

deanyel · #8 08-17-2006, 11:31 PM

I've seen ASR light with and without limp home mode. I actually sold mine - but there's so many nice cars out there for sale with ASR - that I won't touch unless/until there's a proven means of disable. I wouldn't consider 1500 rpms an viable tradeoff.

mespe · #9 08-17-2006, 11:59 PM

Quote:

Originally Posted by deanyel

I've seen ASR light with and without limp home mode. I actually sold mine - but there's so many nice cars out there for sale with ASR - that I won't touch unless/until there's a proven means of disable. I wouldn't consider 1500 rpms an viable tradeoff.

I tend to agree with you about the 1500 RPMs in park, but in "D" the RPMs are more in line around 700 I believe. I need to get tags on it and drive it some, but my limited experience with this car I don't think it's limp home mode even though teh ASR light is on.

Tomorrow I will know as I plan on getting it tagged and driven a bit.

Marty

mespe · #10 08-18-2006, 12:38 PM

I tagged my 400e and drove it to the post office to deliver Mercedes parts. The ASR light was on the whole way, but man this car has alot of power. No limp home mode to the post office. I turned the car off, went in when I came back out, ASR light turned on and the car was in limp home mode. WHAT A DIFFERENCE, coughing and sputtering. I thgen turned the car off and restarted her. A little coughing and sputtering, then NO limphome all the way home. But I was afraid to use the acceleration to make a left turn into oncoming traffic, all I need is for coughing and sputtering as cars approach me at 35 MPH.

I guess my next step is to defeat the ASR and see how she runs.

Marty

cool · #11 03-14-2007, 02:02 PM

mespe e mail philipsee1@yahoo.com, , lot of those folks in london have gone thru the process without having to change anything except the harness, he'll teach you how to fix it, a member of this site called him long distance and was worth the call, now he not only save precious monay, he even had his ASR problems resolved in a flash. Its a trade secret much like a doctor who specialises on a certain field.

mespe · #12 03-14-2007, 11:10 PM

Thanks cool, I sent an email,,,, now I'm playing the waiting game.

I did pull the codes and I still get code 3 but also got code 6. Only got code 3 after the car warmed up. When cold and pulling the codes I get none, whereas with the old EA I got a code 3 even after resetting the codes and not driving the car.

3 - Right EA/CC/ISC actuator (left cylinder bank) (M16/1)

6 - Starter lock-out/backup lamp switch

Marty

deanyel · #13 03-14-2007, 11:46 PM

You're getting these codes from where?

mespe · #14 03-15-2007, 12:07 AM

The two codes I listed are from the diagnostic connector. Ground is pin 1, +12 V is pin 3 probe is on pin 7.

One thing I forgot to mention, is that it seems when the car is acting up it doesn't matter how far I mash (depress) the go pedal all I get is stumbling. I haven't tried to mash it and hold it there, I've mashed it, then released it and mashed and released and mashed again and the car then sometimes starts to respond. I thknk what I need to do is make a video of the symptoms.

deanyel · #15 03-15-2007, 12:16 AM

And you get no codes on 4, or 8, or 17?