Thanks ...agree speed sensor puts out AC, but since is passive device it is milliV, right? And, yeah, frequency vice V since need the stability and accuracy.

So, where does the conversion from milli VAC to VDC occur to provide signal to ASD? In the ABS ECU? Since test procedure calls for about 4 VDC from the sensor (read at ASD module printout), and I am getting over 8 VDC (left front sensor is 4), what could cause? Just a bad sensor in voltage, but stable in frequency?

I just checked all three speed sensors between ABS and ASD modules - all three passed continuity test - each was 0.2 ohms (spec is less than 1 ohm).

Even though had previously removed and tested brake light switch, went through the test procedure for the brake light ...both the operation and rest tests were fine.

Back to the RF wheel speed sensor ...does this mean, given the previous test with twice the VDC output at the ASD module that it is bad? Even with it passing the continuity test?

Any thoughts?

__________________
George Stephenson
1991 350 SDL (200K and she ain't bent, yet)
former 2002 E320 4Matic Wagon - good car
former 1985 300 CD - great car
former 1981 300 TD - good car
former 1972 280 SEL - not so good car
a couple of those diesel Rabbits ...40-45 mpg