intermitant ASR problem 1993 500sl - PeachParts Mercedes-Benz Forum

JimF · #1 03-25-2008, 11:13 AM

Do you mean that you "replaced" your engine wiring harness??

If you re-wired it yourself. . (big job!!!!), then my question is why did you DIY?

In any event, follow the procedure that detailed in MENU#24 on my web pages. Your ETA may be going bad as the root cause of the ASR light.

Dump the codes in the ECUs indicated and see what DTCs are stored.

salsaia · #2 03-25-2008, 01:32 PM

I rewired the ETA unit from the circuit board back. The unit looked ok visualy,including the potentiameter. Is there any test you can do electricaly on the ETA?

Sal

JimF · #3 03-25-2008, 03:08 PM

Quote:

Originally Posted by sal

rewired the ETA unit from the circuit board back. The unit looked ok visualy,including the potentiameter. Is there any test you can do electricaly on the ETA?

Not sure what that means?? "from the ckt board 'back'"?? Do you mean from the ckt board to the output connector?? If yes, did you rewire the pins in the connector??

There are tests but you need somebody who has a "jig" to properly test the ETA's operation. One such place is "Beckmann" (link in MENU#24). They charge $40 to test one. If you have a "working" car similar to yours, you could test it in-situ . . but that's alot of work.

So you DIDN'T replace the wiring harness?? If not, that should be done asap. Actually it should have been done first!

salsaia · #4 03-25-2008, 06:33 PM

Jim
when you say the wiring harness do you mean from the plug{next to the computer box} to the engine.I did replace all the wiring from that plug except for the wiring going to the injectors.
The asr light was interment before I started the job, now it is on all the time

What do I do now?
Can I just eliminate the asr completly?
Sal

deanyel · #5 03-25-2008, 07:07 PM

There is a slick way to eliminate the ASR completely - sell the car. Until then you need to pull the fault codes as Jim suggests.

JimF · #6 03-25-2008, 07:48 PM

Quote:

Originally Posted by salsaia

Jim
when you say the wiring harness do you mean from the plug{next to the computer box} to the engine.I did replace all the wiring from that plug except for the wiring going to the injectors.
What do I do now?

Here's a pictorial on the engine wiring harness. Study it, buy one and replace your old one .
http://www.peachparts.com/Wikka/M104WireHarness
Of course, this is for a M104 but it illustrates that your version has a lot of 'tentacles'.

Quote:

Originally Posted by salsaia

Can I just eliminate the asr completly?
Sal

Yes, take deanyel's suggestion! Seriously, no, it's NOT the ASR, it's the ETA.