APRILIA tuono v4 Owner's Manual page 50

- stop the vehicle;
- key OFF-ON;
- reactivate the system manually
- ride over 5 km/h (3.1 mph): the a-PRC indicator light should extinguish;
- ATC system working correctly.
If the 'ATC system deactivated' indication persists:
NOTE
SHOULD THIS OCCUR, CONTACT AN aprilia Official Dealer.
THE ATC SYSTEM ACTS ON THE REAR WHEEL ON THE BASIS OF INFORMA-
TION RECEIVED FROM TONE WHEELS INSTALLED ON BOTH WHEELS. AL-
WAYS CHECK THAT THE TONE WHEELS ARE CLEAN, AND REGULARLY
CHECK THAT THE GAP BETWEEN THE TONE WHEEL AND THE SENSOR IS
CONSTANT AROUND THE ENTIRE CIRCUMFERENCE OF THE TONE WHEEL
ITSELF. SHOULD THE WHEELS BE REMOVED AND REFITTED, IT IS VERY IM-
PORTANT TO CHECK THAT THE DISTANCE BETWEEN TONE WHEEL AND
SENSOR IS THE ONE SPECIFIED. FOR CHECKING AND ADJUSTMENT, CON-
TACT AN Authorised APRILIA Workshop.
NOTE
PROLONGED ROTATION OF THE REAR WHEEL WHILE THE FRONT WHEEL IS
STATIONARY (BURNOUT, MOTORCYCLE ON CENTRE STAND ETC.) MAY
CAUSE THE SYSTEM TO AUTOMATICALLY DEACTIVATE AND THE a-PRC IN-
DICATOR LIGHT TO LIGHT CONSTANTLY.
TO REACTIVATE, TURN THE IGNITION SWITCH OFF AND THEN ON AGAIN AND
SELECT THE REQUIRED SETTING.
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