Chart A13 Missing Wheel Sensor Signal: Notes
WARNING: This page is about a different car, the 1988 Buick Riviera and 1988 Buick Reatta. However, it is still accessible from the selected car via links, so may be relevant.
EBCM checks wheel sensor output and continuity checks. It also checks output signal with expected valve and compares each output signal with other ones. If EBCM detects wheel sensor reading that is missing, code will be set.