49
ANTI-LOCK BRAKE SYSTEM (ABS)
CHAS
[C-4] ABS WARNING LIGHT FLASHES EVERY 0.5 SECOND.
This state means that the ECU has not recorded the past malfunction. If the ABS warning light goes on once
in a while but does not record the past malfunction, it is estimated that the ABS warning light went on or
flashed because of failures on other places of scooter. Explain the possible reason enough to the customer
for better understanding.
1. Warning light flashes
Following are probable causes for cases when the ABS warning light flashed while riding, but it recov-
ered to be “normal”, or “the ABS warning light flashed but it stopped flashing when the main switch was
turned off once and turned on again”.
1) While the scooter stood with the centerstand, the rear wheel was rotated. The system is normal.
2) The rear wheel raced. The system is normal.
3) Ran in wheelie. The system is normal.
4) The scooter continuously ridded on the extremely uneven road.
The system is normal.
5) The brake switch is defective or improperly adjusted. Replace or adjust.
2. Voltage drop
For the ABS to operate correctly, the voltage should be always higher than the specified voltage. If the
voltage drops lower than 10V, the ABS warning light goes on and stops the ABS operation. When the
voltage recovers to be higher than 10V, the system restarts to operate, but the state which the voltage
dropped lower than 10V means that there are failures with magneto, battery or rectifier / regulator. Cor-
rect the failures following regular procedures for normal operation of power supply system.
3. ABS is stopped by ECU
This state occurs because the ECU judged that the system must stop since it was exposed to the envi-
ronment of extremely strong radio wave, static electricity or radioactivity.
No defectiveness is shown at present. There is no problem about system function. Explain the customer
that the ABS system will operate normally.
