Fail-Safe Chart

1. FAIL SAFE OPERATION 
   • If there is a problem with sensor signals or actuator systems, the skid control ECU prohibits power supply to the brake actuator assembly and informs the ECM of VSC system failure.

     The brake actuator assembly turns off each solenoid and the ECM shuts off VSC control (traction control signal) from the skid control ECU accordingly, which turns out to be as if the ABS, TRAC and VSC systems were not installed.

     The ABS control will be prohibited, but EBD control will continue as much as possible. If EBD control is impossible, the brake warning light will come on to warn the driver (See DIAGNOSIS SYSTEM  ).

   • If system components have any malfunction before starting control, immediately stop the operation. If system components have any malfunction during control, gradually stop the control so as not to trigger a sudden change in vehicle conditions.

     If it is impossible to control the systems, the warning light comes on to inform the driver of termination of the systems (See DIAGNOSIS SYSTEM  ).

   HINT:

   If the brake booster encounters a malfunction, brake performance is gradually lost and ABS, BA, TRAC and VSC systems are prohibited.

   ABS, EBD and BA system: 

   FAIL-SAFE CHART
   
   

   Malfunction Area	Control Method
   ABS system	ABS, BA, TRAC and VSC control prohibited
   BA system	ABS, BA, TRAC and VSC control prohibited
   EBD system	ABS, EBD, BA, TRAC and VSC control prohibited

   HINT:

   A malfunction in either the ABS or BA system will result in an identical operation, with ABS, BA, TRAC and VSC system control prohibited.

TRAC and VSC system: 

HINT:

As for the TRAC and VSC systems, different systems prohibit different controls depending on the malfunctioning part.