Symptom Chart

CAUTION:

ABS may operate in the following conditions without hard braking: Slippery 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 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 diagnostic trouble code associated with other system may be set when the ignition switch is turned on with connector(s) disconnected. On completion, check all systems for diagnostic trouble code(s). If diagnostic trouble code(s) are set, erase them all.

SYMPTOM CHART

Symptoms	Inspection Procedure
Scan tool cannot communicate only with ABS-ECU.	INSPECTION PROCEDURE 1: SCAN TOOL CANNOT COMMUNICATE ONLY WITH ABS-ECU
Brake warning light stays ON with the parking brake lever released.	INSPECTION PROCEDURE 2: BRAKE WARNING LIGHT STAYS ON WITH THE PARKING BRAKE LEVER RELEASED.
ABS warning light does not illuminate when ignition switch is turned to the ON position (Engine stopped).	INSPECTION PROCEDURE 3: ABS WARNING LIGHT DOES NOT ILLUMINATE WHEN IGNITION SWITCH IS TURNED TO THE ON POSITION (ENGINE STOPPED).
Brake warning light does not illuminate when the ignition switch is turned to ON position (Engine stopped).	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.	INSPECTION PROCEDURE 5: ABS WARNING LIGHT STAYS ON AFTER THE ENGINE IS STARTED.
Abnormality in brake operation	INSPECTION PROCEDURE 6: ABNORMALITY IN BRAKE OPERATION
ABS system inoperative	INSPECTION PROCEDURE 7: ABS SYSTEM INOPERATIVE.
ABS-ECU power supply circuit system	INSPECTION PROCEDURE 8: ABS-ECU POWER SUPPLY CIRCUIT SYSTEM
ABS operate too frequently.	INSPECTION PROCEDURE 9: ABS OPERATES TOO FREQUENTLY.