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Old 02-20-2011, 01:36 PM
jeffstri jeffstri is offline
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Location: CT
Join Date: Sep 2010
Posts: 45
Mein Auto: 740il
Originally Posted by bluebee View Post
By now, you've seen Bill's consistent posts that the diagnostic machines can't tell you what you need to know because they're all hooked up wrong (I'm surprised we know that but the BMW technician does not know that - or - maybe the BMW tech knows something we don't know ...).
With all due respect, this is a bit over the top. There is a lot more that the BMW "diagnostics machines" can do than just read fault codes, which seems to be the only thing you and Bill have done with "diagnostic machines." The fault code itself is not mean to be a diagnosis.

What makes you think the BMW diagnostic machines are "hooked up wrong?" They scan for fault codes and then provide a series of tests to determine what the cause of the fault is. It's no different in principle from what you and Bill recommend, except that the BMW diagnostic equipment allows you do more extensive testing than just measure resistances and voltages. For example, the software that the BMW diagnostic machines use (e.g., INPA, DIS) allows the tech to activate the ABS/DSC components (e.g., DSC pump and valves, precharge pump) and measure pressures, among other things. The pressure sensor test via the precharge pump is much more reliable than the pressure sensor voltage tests that you and Bill have suggested.
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