Fail Safe Operation

If there is a problem with sensor signals or actuator systems, the skid control ECU prohibits power supply to the ABS and VSC actuator and informs the ECM of VSC system failure.

The ABS and VSC actuator 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, VSC and TRAC systems were not installed.

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

SYMPTOM CHART

Malfunction

Symptom

ABS system

ABS, BA, TRAC, and VSC control prohibited

BA system

ABS, BA, TRAC, and VSC control prohibited

EBD system

ABS and EBD control prohibited

TRAC system

TRAC and VSC control prohibited

VSC system

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.

• If control is prohibited due to a malfunction during operation, control will be disabled gradually. This is to avoid sudden vehicle instability.

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