Here we go again.... I gave up on the diagnostic plug, took my Fluke and noticed that the resistance of the rear abs sensor was several megaohms... Hmm, maybe I should scope/log all pins in the plug, and compare before and after replacing that sensor... Does anyone of you know if there's a logging freeware somwhere ? Building an i/f or level converter for the serial port is no problem .... Regards, and thanks for all replies Attila - SM4RAN _______________________________________________ http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist