Symptom Chart

CAUTION:

ABS may operate in the following conditions without hard braking: Low mu road surface, high-speed turn, and bumpy road surface. When asking the customers, confirm that they have/have not encountered ABS operation in corresponding conditions.
During ABS operation, the brake pedal is pulled forward gradually, and the noise occurs at the same time. This is because the brake line pressure varies intermittently to prevent the wheel lock, and not a system malfunction.
During diagnosis, a DTC associated with other system may be set when the ignition switch is turned "ON" with connector(s) disconnected. On completion, confirm all systems for DTC(s). If DTC(s) are set, erase them all.

Trouble symptom	Inspection procedure number	Reference page
Scan tool (M.U.T.-III) communication with ASC system is impossible.	1	SYMPTOM PROCEDURES
Brake warning light stays ON with the parking brake lever released (ABS warning light is OFF).	2	SYMPTOM PROCEDURES
When the ignition switch is turned to the "ON" position (engine stopped), the ABS warning light does not illuminate.	3	INSPECTION PROCEDURE 3: WHEN THE IGNITION SWITCH IS TURNED TO THE "ON" POSITION (ENGINE STOPPED), THE ABS WARNING LIGHT DOES NOT ILLUMINATE
Brake warning light does not illuminate when the ignition switch is turned to "ON" position (engine stopped).	4	INSPECTION PROCEDURE 4: BRAKE WARNING LIGHT DOES NOT ILLUMINATE WHEN THE IGNITION SWITCH IS TURNED TO "ON" POSITION (ENGINE STOPPED)
ABS warning light stays ON after the engine is started.	5	INSPECTION PROCEDURE 5: ABS WARNING LIGHT STAYS ON AFTER THE ENGINE IS STARTED
ASC indicator light stays ON after the engine is started.	6	INSPECTION PROCEDURE 6: ASC INDICATOR LIGHT STAYS ON AFTER THE ENGINE IS STARTED
ASC-OFF indicator light stays ON after the engine is started.	7	INSPECTION PROCEDURE 7: ASC-OFF INDICATOR LIGHT STAYS ON AFTER THE ENGINE IS STARTED
The stability control/TCL system cannot be disabled when ASC OFF switch is pressed for 3 seconds or more to turn the system OFF.	8	INSPECTION PROCEDURE 8: THE STABILITY CONTROL/TCL SYSTEM CANNOT BE DISABLED WHEN ASC OFF SWITCH IS PRESSED FOR 3 SECONDS OR MORE TO TURN THE SYSTEM OFF
Abnormality in brake operation.	9	INSPECTION PROCEDURE 9: ABNORMALITY IN BRAKE OPERATION
Abnormality in active stability control system operation.	10	INSPECTION PROCEDURE 10: ABNORMALITY IN ACTIVE STABILITY CONTROL SYSTEM OPERATION
ASC-ECU power supply circuit system.	11	INSPECTION PROCEDURE 11: ASC-ECU POWER SUPPLY CIRCUIT SYSTEM
ABS/stability control/TCL operates too frequently.	12	INSPECTION PROCEDURE 12: ABS/STABILITY CONTROL/TCL OPERATES TOO FREQUENTLY
HSA (Hill Start Assist) does not work.	13	INSPECTION PROCEDURE 13: HSA (HILL START ASSIST) DOES NOT WORK
HSA (Hill Start Assist) works on a flat road.	14	INSPECTION PROCEDURE 14: HSA (HILL START ASSIST) WORKS ON A FLAT ROAD
The initial check sound of hydraulic unit is loud.	15	INSPECTION PROCEDURE 15: THE INITIAL CHECK SOUND OF HYDRAULIC UNIT IS LOUD