Yamaha YP250A 1999 Supplementary Service Manual page 44

Goes on
Goes off
ABS
warning light
ANTI-LOCK BRAKE SYSTEM (ABS)
Preparation
4. Flashes while riding.
No problem exists with the ABS function, but it
is estimated that the input has unstable factors.
(For details, refer to the troubleshooting sec-
tion.)
NOTE:
The test coupler adapter may be connected with
the test connector.
5. Test connector
By removing the lower panel of windscreen,
the installed 4 pin connector 1 can be seen.
This is the test connector to call the ABS mal-
function code.
When the test coupler adapter 1 is connected
with the test connector, the malfunction history
recorded in the ECU will be displayed by the
ABS warning light flashing.
Test coupler adapter
90890-03149
NOTE:
If the scooter rides with the test coupler adapter
connected, the ABS warning light flashes.
36
CHAS