|Topic Review (Newest First)|
|03-19-2018 11:32 AM|
Availability of ASR and ASD
Originally Posted by Dr.Grillz View Post
Here's some other information I found on availability of ASR and ASD in Europe:
- ASD (presented at IAA 1985) was only offered for the I6 models from 1987 on.
- ASR I (presented at IAA 1985) was available only on the larger V8 models from 1987 on.
- Starting 1989 ASR II was available on all models
|04-23-2014 05:17 AM|
|w2hmh||Hats off to Dr. Grillz who nailed this one...received the accumulator ($98), installed it and bled the system all in less than an hour...problem solved!|
|04-05-2014 09:39 AM|
|Dr.Grillz||In my case, it was the accumulator. Even at idle, it sounded as someone was taking a hammer to my car with the sound coming from behind the firewall on the driver's side. At speed, the sound was less obvious. Also noted, the ASD is pumped via a SLS pump thats exactly the same as the ones found on a 560. There are hoses that run from it. When the car was in idle, you can see the hoses react to the "knock" sound I was hearing coming from the ASD assembly.|
|04-05-2014 06:15 AM|
My car definitely has ASD
1) The data card lists option 211 "ASD-Auto Locking Differential
2) There are hydraulic lines that go to each axle half on the differential
.....just ordered the accumulator on a hunch...sounds like a worthwhile shot....I know these things can go bad as I had issues with a 3000TD with leveling suspension that had a bad accumulator...I will post results after I receive and install the accumulator...
|04-04-2014 09:17 PM|
ASR and ASD both utilized that little window in the speedometer that would light up when activated.
A little info on the two from a 1991 article that provides good info. I have driven two cars with ASD (my 190E AMG and a 2.5-16) and can say that ASD is a great option to have and beneficial on snowy roads.
|04-04-2014 06:15 PM|
|mclare||Well is his problem in the ASD or ASR. I know they are two different systems, but the way he described it to me, he actually meant ASR. If he took it out on the ice and tried to skid it, the ASR would take over and not let him do that. Also, the ASR has the warning light in the center of the speedo as mine did, and I assumed he was referring to that.|
|04-04-2014 04:30 PM|
|w2hmh||Thanks...might be worth a shot....|
|04-04-2014 02:49 PM|
People often mistaken ASR for ASD. Totally different systems, one deals with brakes (ASR) while the other is a hydraulic limited slip system.
My 190E AMG when I first bought it had a non-functioning ASD unit that had a thumping sound coming from the front left fender. The ASD pump/unit is actually located there (at least in the W201/W124's). The assembly unit has an accumulator that looks a lot like the SLS accumulators seen on wagons, 560SEL's and 16v 190E's. However, this accumulator has "ASD" stamped on it. They are available only from the dealership, I'm not sure whether there ae aftermarket alternatives but I wouldn't risk it. Simply replaced the sphere/accumulator and refill and you should have your problem solved.
|04-04-2014 12:55 PM|
Thanks.....more info is good..this car definitely has the ASD option....the unit is located under the car in the right rear of the car where the ASD valve is located and the thump can be felt in the unit and in the lines going to and from it....my current hypothesis is that for some reason the ASD controller senses that the car is being powered on again and again...I am guessing this as the manual that I have indicates that the ASD control module will pulse the ASD valve briefly on powerup and that a mild thump from the right rear may be heard.
My current approach is to monitor the control voltage to the ASD valve to see if it is being pulsed (I guess that it is)....then on to the ASD control unit and perhaps the OVP relay....intermittent contacts, etc?????
|04-04-2014 10:03 AM|
|compu_85||PS: I'm in the process of getting the service into books on ASD. If I'm able to get the info I'll share with the rest of the class.|
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