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 brakelight switch circuit. See BRAKELIGHT SWITCH CIRCUIT under DIAGNOSIS & TESTING. Check ABS/TRAC actuator. See appropriate ABS/TRAC ACTUATOR CHECK under DIAGNOSIS & TESTING . If ABS/TRAC actuator is okay, check hydraulic system for leaks. See Figure. If all listed items test okay, replace ABS/TRAC ECU.