Trouble 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 if they have encountered ABS operation in corresponding conditions.
Even when the ASC operation display does not appear, the ASC operation noise (pump, motor, and others) may be generated. This occurs because the pump, motor, and others operate to accumulate the braking force before the application of braking force to wheels, and it is not a malfunction.
During ABS operation, as the brake pedal is gradually drawn inward, the noise is generated. This occurs because the brake line pressure varies intermittently to prevent the wheel lock, and it is not a malfunction.

CAUTION: 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 diagnostic trouble code(s). If diagnostic trouble code(s) are set, erase them all.

TROUBLE SYMPTOM CHART

Trouble symptoms		Inspection procedure
The scan tool cannot communicate with the ABS/ASC system.	The scan tool cannot communicate with all systems.	Refer to TROUBLESHOOTING .
The scan tool cannot communicate with the ABS/ASC system.	The scan tool cannot communicate only with ASC-ECU.	Refer to INSPECTION PROCEDURE 1: THE SCAN TOOL CANNOT COMMUNICATE WITH THE ABS/ASC SYSTEM.
With the parking brake released, the brake warning light remains illuminated (ABS warning light is turned off).		Refer to INSPECTION PROCEDURE 2: WITH THE PARKING BRAKE RELEASED, THE BRAKE WARNING LIGHT REMAINS ILLUMINATED (ABS WARNING LIGHT IS TURNED OFF).
The ABS warning light does not illuminate when ignition switch is turned to the ON position (engine stopped).		Refer to INSPECTION PROCEDURE 3: THE ABS WARNING LIGHT DOES NOT ILLUMINATE WHEN IGNITION SWITCH IS TURNED TO THE ON POSITION (ENGINE STOPPED).
The brake warning light does not illuminate when ignition switch is turned to the ON position (engine stopped).		Refer to INSPECTION PROCEDURE 4: THE BRAKE WARNING LIGHT DOES NOT ILLUMINATE WHEN IGNITION SWITCH IS TURNED TO THE ON POSITION (ENGINE STOPPED).
The ABS warning light remains illuminated even after the engine is started.		Refer to INSPECTION PROCEDURE 5: THE ABS WARNING LIGHT REMAINS ILLUMINATED EVEN AFTER THE ENGINE IS STARTED.
The ASC warning display remains illuminated even after the engine is started.		Refer to INSPECTION PROCEDURE 6: THE ASC WARNING DISPLAY STAYS ON EVEN AFTER THE ENGINE IS STARTED.
The ASC OFF display remains illuminated after the engine is started.		Refer to INSPECTION PROCEDURE 7: THE ASC OFF DISPLAY REMAINS ILLUMINATED AFTER THE ENGINE IS STARTED.
After the ASC OFF switch is pressed to turn "OFF," the skid control/TCL cannot be cancelled.		Refer to INSPECTION PROCEDURE 8: AFTER THE ASC OFF SWITCH IS PRESSED TO TURN "OFF," THE STABILITY CONTROL/TCL CANNOT BE CANCELLED.
Abnormality in brake operation		Refer to INSPECTION PROCEDURE 9: ABNORMALITY IN BRAKE OPERATION
Skid control/TCL does not operate.		Refer to INSPECTION PROCEDURE 10: SKID CONTROL/TCL DOES NOT OPERATE.
ASC-ECU power supply circuit system		Refer to INSPECTION PROCEDURE 11: ASC-ECU POWER SUPPLY CIRCUIT SYSTEM
ABS/skid control/TCL operates too frequently.		Refer to INSPECTION PROCEDURE 12: ABS/SKID CONTROL/TCL OPERATES TOO FREQUENTLY.
Steering wheel sensor power supply circuit system		Refer to INSPECTION PROCEDURE 13: STEERING WHEEL SENSOR POWER SUPPLY CIRCUIT SYSTEM
The initial check sound of hydraulic unit is loud.		Refer to INSPECTION PROCEDURE 14: THE INITIAL CHECK SOUND OF HYDRAULIC UNIT IS LOUD