From: individual@spaced.me.uk   
      
   Hi all,   
      
   I'm trying to test the functionality of a car ABS unit as far as it not   
   putting up the ABS fault light and pre a professional refurb.   
      
   The fault code was 'open rear wheel speed sensor' but the actual fault   
   is a failed 'signal reference' provision within the ABS ECU itself.   
      
   So the ABS ECU 'thinks' it's an external fault when it's actually internal.   
      
   So, for the purposes of the test, the assumption is that the 'signal   
   reference' pins are all directly bonded together and to the ABS ECU   
   ground, so that I could 'borrow' the 'signal reference' from one of the   
   other wheel speed sensors or the ground itself and see if that clears   
   the fault and extinguishes the ABS light. We tested this using a DMM on   
   low ohms between ABS ECU ground and each of the 'signal reference pins'.   
      
   I didn't think to note the actual resistance of the 3 working pins, just   
   that there was one that was o/c. (Doh).   
      
   When I measure at the actual wheel sensor connector with it   
   disconnected, on the good side I read 5V across the pair, whereas on the   
   bas side I read nothing, but do between the signal pin and chassis ground.   
      
   Cheers, T i m   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)