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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 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 diagnostic trouble code associated with other system may be set when the power supply mode of the electric motor 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 symptomInspection procedure numberReference page
Scan tool (M.U.T.-IIISE) cannot communicate with the ABS/ASC system is impossible.Scan tool (M.U.T.-IIISE) cannot communicate with all systems.-Refer to GROUP 54C - Troubleshooting .
Scan tool (M.U.T.-IIISE) cannot communicate only with ASC-ECU.1
ASC OFF light flashes at a rate of 2Hz.2
The brake warning light does not go out (ABS warning light is OFF) although the parking brake is released.3
ABS warning light does not illuminate when electric motor switch is turned ON.4
Brake warning light does not illuminate when the electric motor switch is turned ON.5
ABS warning light stays ON after the engine is started.6
ASC warning light stays ON after the engine is started.7
ASC OFF light stays ON after the engine is started.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.9
Abnormality in brake operation.10
ASC does not operate or faulty ASC operate.11
ASC-ECU power supply circuit system. 12
Steering wheel sensor power supply circuit system13
ABS/stability control/TCL operates too frequently.14
HSA (Hill Start Assist) does not work.15
HSA (Hill Start Assist) works on a flat road.16
The initial check sound of hydraulic unit is loud17