Quote:
Originally Posted by cool
common cause is fault code N4/1 no canbus communication, so far no one in the whole world has ever come up with an exact science on how to resolve the issue, all guesses (better than nothing i should say) but so far no one has ever sincerely reported their problem to be resolved, if you must consider changing everything then that is not resolving the issue prudently. the usual culprit which sets off this ASR issue are the bad wiring harness on the ETA and the engine harness, it somehow destroys the ASR Control Module (located inside your black box).
Still hoping someone may enlighten us victims of ASR nightmare with a true blue resolution and finally putting to rest this 15 year old problem.
|
The "canbus" . . . actually it's CAN bus . . . error code is just a symptom of failing w/h or a going-bad ETA or failing brake switch or NSS. Those are the main culprits. The CAN itself does not fail just the inability of the ECUs on the bus to communicate.
I've personally NEVER seen a bad ASR module as a result of a going-bad ETA, w/h or anything else and I've seen a lot of them.
My ETA writeup is the BEST overall treatise on the problem b/c it shows initial symptoms plus DTCs, then, as it progresses, variations on these symptoms and codes, then finally what happens when the ETA dies.
Also later in the writeup (about 2yrs down the road) the DTCs and LH problems return but now, it's another module, the NSS.
The reason that "no one has come up with an exact science . . . " is simply that there isn't any method including MB's Star system that can diagnose
which part in the chain is bad.
This is a common problem in
ALL electronic system where there are electronic elements (ECUs) in
series. Any one of them can cause a problem and it's impossible to diagnose if there are no intermediate TEST-POINTS. That's the main problem with Mercedes' fly-by-wire system.
When Mercedes built these cars, the concept of adding TPs was in it's infancy. Nobody thought about adding this important feature. Now it's the norm. Had some TPs been used and brought to a test connector, the problem would have become trivial.
But however trivial it might have become, the "FIX" would still be expensive!!
