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UPDATE: ABS/ESP (BOSCH ABS 8.0) - C0131 Posted by MC [Email]  (#1472) [Profile/Gallery]
(more from MC) on Sun, 4 Jan 2015 19:49:38
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I'll try to keep this post a bit more brief than my previous one, while still keeping reference to the symptoms of the situation.
(2005 Aero Wagon; w/ ESP{Bosch 8.0 ABS control unit))
Removed the ABS/ESP module for part number reference and research.
Bosch Part number: 265 950 372
While the module was removed I took it for a quick test drive.
Granted that the "Check Engine", ABS,"BRAKE", and ESP warning lamps were all on now as well as the speedometer inoperative (due to missing signal transfer via the ABS module),... nothing was amiss. Normal drive.
However, During the test drive I made a couple stops...
On the first re-start I was greeted with the "GearBox" MIL and it, no-doubt, dropped into transmission fail-safe mode when I attempted to shift into Drive or Reverse gear.
Turn it off and re-cycle the key....this time No-Crank (no-start),..but in absence of the "KEY NOT ACCEPTED" SID message this time.
Cycle the key again...back to the "normal" No-ABS/no-speedometer situation. ...normal drive back to the shop.
So, now I'm a bit concerned,...that the intermittent symptoms were still present even with the ABS module removed. ...??? Could this be considered a normal situation-of-events due to the missing module? Or is there another/more deeply-rooted malfunction at hand here?
Kept the vehicle out-of-commission and moved it into the workshop for the weekend.
A bit of WIS research and some diagnostic probing and I discovered the K-line pin had pushed it's way out of the back of the diagnostic-link-connector (DLC). This being the cause of the no-communication issue with the ABS/ESP module.
Now with ABS communication I was able to scan the unit and recovered an erroneous fault code C0131. Concerning Brake-pedal "Pressure Sensor Circuit".
The code would only clear after a few attempts and came back a few times after cycling the ignition key on-off.
NOTE: Checked data-stream input-value for the pressure-sensor and it appeared as correct at that time (0 with brake pedal at rest)
This fault code appears to be one of the more common indicators of a ABS/ESP module failure.
We were able to locate a used ESP module from a regional, wholesale, parts-recycler and it should be in early next week.
I am still lacking an explanation as to how the ABS/ESP module failure correlates to any of the other intermittent malfunctions.
Unless the module (or absence of the module?) just happens to be that capable of disrupting the P-CAN communications.
NOTE here too: I did some probing around on the CAN P-Bus lines with a hand-held oscilloscope. While first dialing in the scope-range I was getting some odd, intermittent signal patterns on the CAN-LO wire at the ABS module connection. Decided to dig in deeper and probe CAN Hi/LO at the MIU connection and the TCM. After I got the scope dialed-in everything re-checked OK and the CAN bus was lively-active and happy.
Suffice to say; I'm still very suspicious that another module may be intermittently afflicting the P-bus.
...Stay tuned.
->Posting last edited on Sun, 4 Jan 2015 19:52:44.
, Sun, 4 Jan 2015 19:49:38 <-- Viewing This Message
, Mon, 5 Jan 2015 16:00:52, Mon, 5 Jan 2015 16:00:20, Wed, 7 Jan 2015 09:06:21
, Mon, 5 Jan 2015 08:27:34, Wed, 7 Jan 2015 09:22:43, Mon, 5 Jan 2015 03:12:29, Wed, 7 Jan 2015 09:12:12
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