Quote:
Originally Posted by John Firestone  Thanks for the added information. I would not have guessed what you wrote. Is the engine indeed a U.S. market, early OBD-II M44?
If it is, its DME won't be happy without wheel speed pulses from the ABS unit. The signal is a 12V pulse train that is 48/9 (5 1/3) times faster than the speedometer speed pulses from the rear differential. |
Yes it is early M44 with a 5.2 DME.
I don't see anywhere on the wiring diagram for the cluster that abs connects to it, other than on the infernal Txd data line. So I dont see how, other than on that wire (in the form of a data message) that DME could get a processed 48t signal.
The VSS is a sqaure wave sensor, 9 pulse/rev. Wheels are 48t a/c.
What I don't, and really need to, know is this: The VSS output from the cluster is what on an E36? Square, 9t, 48t, data, 12v, 5v? If anyone can hook a scope up and see what it looks like I think that might be what I need to proceed. A lot of this is just thinking out loud.