Abs Does Not Operate Efficiently
CAUTION:
If ECU replacement is necessary during testing, always ensure ECU connectors and ground circuit are okay. If either are suspect, repair and repeat testing to confirm ECU malfunction.
Retrieve Diagnostic Trouble Codes (DTC). See RETRIEVING TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Check speed sensor circuits. See DTC 31, 32, 33 and 34 (speed sensor circuit codes) under SELF-DIAGNOSTIC SYSTEM. Check stoplight switch circuit. See STOPLIGHT SWITCH CIRCUIT under DIAGNOSIS & TESTING . Check ABS actuator. See appropriate ABS ACTUATOR CHECK under SELF-DIAGNOSTIC SYSTEM. If ABS actuator is okay, check hydraulic system for leaks. See Figure. If all listed items test okay, replace ABS ECU.