Abs Does Not Operate Efficiently

Retrieve Diagnostic Trouble Codes (DTC). See RETRIEVING DIAGNOSTIC TROUBLE CODES (DTC)  under SELF-DIAGNOSTICS. Check speed sensor circuits. See DTC 31 , 32, 33, 34: SPEED SENSOR CIRCUIT MALFUNCTION under DIAGNOSTIC TESTS . Check stoplight switch circuit. See STOPLIGHT SWITCH CIRCUIT under CIRCUIT TESTS . Check ABS actuator. See ACTUATOR CHECK  under COMPONENT TESTS. If ABS actuator is okay, check hydraulic system for leaks. If all above items test okay, replace ABS ECU.