Abs Does Not Operate Efficiently

Retrieve Diagnostic Trouble Codes (DTCs). See RETRIEVING TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM . Check speed sensor circuits. See DTCs 31, 32, 33, 34, 35 and 36 (speed sensor circuit codes) under CIRCUIT TESTS . Check stoplight switch circuit. See STOPLIGHT SWITCH CIRCUIT  under CIRCUIT TESTS. Check ABS actuator. See appropriate ACTUATOR CHECK under CIRCUIT TESTS . If ABS actuator is okay, check hydraulic system for leaks. If all listed items test okay, replace ABS ECU.