ABS frustration

[Steve Obert]

I have been chasing a problem on the right wheel sensor on the rear of my
'93.  The abs fails with a code of 7 but the electrical readings on the
sensor are always perfect both from the connector at the computer and the
connector under the car.  I have changed out the ABS computer ( per the FSM
fault chart ) but it continues to fail.  All summer it never worked, now it
is working probably 60% of the time.

Anybody got any troubleshooting tips or a used sensor to sell me?