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hans.schaaper · 2nd April 2010, 20:19

Thanks Duncan,

It indeed appears to be a pulsed signal.
The level on the MK3 pin is high (11.5 V) with nothing connected.
Apparently the ABS ecu pulls the level low in the frequency of the wheel's rotation.
I did pull it low in a pulsed fashion with a test lead and the MK3 immediately started guidance and it also showed a wheel speed in the diagnostics menu.
I will check it out later with an oscilloscope.

I also found a quote on the Bimmerboard forum that said " The MK3 will not update the position with the wheel sensor disconnected".

Thanks, Hans

2nd April 2010, 20:19	#3
hans.schaaper Avid contributor rover 75 2.5 V6 auto Join Date: Feb 2008 Location: Alkmaar Posts: 197 Thanks: 0 Thanked 3 Times in 3 Posts	Thanks Duncan, It indeed appears to be a pulsed signal. The level on the MK3 pin is high (11.5 V) with nothing connected. Apparently the ABS ecu pulls the level low in the frequency of the wheel's rotation. I did pull it low in a pulsed fashion with a test lead and the MK3 immediately started guidance and it also showed a wheel speed in the diagnostics menu. I will check it out later with an oscilloscope. I also found a quote on the Bimmerboard forum that said " The MK3 will not update the position with the wheel sensor disconnected". Thanks, Hans