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.
caution During diagnosis, a diagnosis code associated with other system may be set when the ignition switch is turned on with connector(s) disconnected. On completion, confirm all systems for diagnosis code(s). If diagnosis code(s) are set, erase them all.
Trouble symptom
 Inspection procedure number
 Reference page
M.U.T.-III cannot communicate with the ABS/ASC system.
 M.U.T.-III cannot communicate with all systems.
 -
 Refer to GROUP 54C - Troubleshooting .
M.U.T.-III cannot communicate only with ASC-ECU.
 1
ASC OFF display flashes at a rate of 2Hz.
 2
Brake warning lamp stays ON with the parking brake lever released (ABS warning lamp is OFF).
 3
ABS warning lamp does not illuminate when ignition switch is turned to the ON position (Engine stopped).
 4
Brake warning lamp does not illuminate when the ignition switch is turned to ON position (Engine stopped).
 5
ABS warning lamp stays ON after the engine is started.
 6
ASC warning display stays ON after the engine is started.
 7
ASC OFF display or ASC OFF lamp stays ON after the engine is started.
 8
The stability control/traction control function 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
Stability control/TCL does not work.
 11
ASC-ECU power supply circuit system
 12
ABS/stability control/TCL operates too frequently.
 13
ESS inoperative or improper operative.
 14