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#11
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
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#12
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No I don’t think that it is. I am pretty confident it’s a sine wave signal. At any rate, although I could be wrong, square waves don’t seem suitable to measuring/reporting data on something as variable as engine speed.
However, I can’t confirm first hand if it is a sine wave signal on pin #9. I can only say that I read on another forum (from someone who tested it using an oscilloscope) that it is. What I can confirm firsthand is that it works perfectly with a device that needs a sinusoidal tach signal. Last edited by Frankiesayrelax; 10-24-2020 at 07:09 PM. |
#13
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Digital Competition Systems The older I get... The faster I was... No Fear |
#14
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I know that up to around 2004 most Porsches used a 12V square wave on pin 9 of the OBD2 for the tach signal. But not for 2005+. Found this pic on the intertubes (pelican) from an early Porsche Boxster, as an example. Great find and documentation there, @frankie! Glad you got your problem solved and thanks for letting us know. I bookmarked your post, just in case...
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2001 X5 3.0i, 203k miles, AT, owned since 2014 |
#15
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Then I stand corrected! At any rate, all I know is my shift light works and reads (and displays) rpms perfectly! So I’m a happy camper.
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#16
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reps sent |
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rpm, shift light, tachometer |
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