PIAGGIO MP3 500 i.e. SPORT Service Station Manual page 372

MP3 500 i.e. SPORT Business_LT_ ABS-ASR_EU_USA
Braking system
(2015)
7. Instrument panel
8. Rear wheel ABS sensor
9. Front left wheel ABS sensor
10. Front right wheel ABS sensor
11. ABS control unit
12. CAN L line
13. CAN H line
OPERATION OF THE ABS
General considerations
•
The front circuit is the same as the rear one.
•
The ABS intake valve is normally open and is closed only when the system intervenes to
prevent locking.
•
The exhaust valve is normally closed and is only opened when the system intervenes to
prevent locking.
•
With the system in stand-by mode, the ABS module controls, with the sensors, the wheel
speed and acceleration instant by instant to assess any slippage of the wheels.
•
While in stand-by, the system does not intervene in any way on the braking of the rider, the
braking system is identical to the one without ABS.
ABS cycle phases
A - Pressure reduction: if a wheel lock risk is detected, the brake pressure is reduced. The ABS module
closes the inlet valve, opens the exhaust valve and the recovery pump is activated. A part of the brake
fluid is accumulated in the low pressure accumulator. This pressure reduction is made gradually so the
wheel spin is reported in the optimal values.
B - Pressure restoration: once the wheel spin returns in a stable zone, the fluid pressure in the brake
circuit is reset, because the brake fluid is pumped in the circuit again with the combined action of the
recirculation pump and the brake pump. In this case the inlet solenoid valve is open, while the exhaust
solenoid valve is closed and the hydraulic pump active.
Guide to diagnosis
Every time switching the key to «ON», at least one current or memorised ABS system error is identified
immediately (whose diagnostic requires passing 5 km/h):
- The ABS warning light is on permanently and the ABS system is deactivated. The system operates
perfectly just as any other braking system without ABS.
Every time switching the key ON, if no current or memorised system error is identified, the ABS warning
light flashes:. Then:
- When exceeding 5 km/h, if no relevant error is identified, the ABS warning light turns off.
- If at least one failure is identified, the ABS warning light is on permanently and the ABS system is
deactivated. The system operates perfectly just as any other braking system without ABS.
BRAK SYS - 372