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6. Bleed:
• Brake system
Refer to "BLEEDING THE HYDRAULIC
BRAKE SYSTEM (ABS) (for YP250RA)" on
page 3-11.
7. Check the operation of the hydraulic unit ac-
cording to the response at both brake levers.
(Refer to "HYDRAULIC UNIT OPERATION
TESTS" on page 4-65.)
ECA2DM1016
NOTICE
Always check the operation of the hydraulic
unit according to the response at both brake
levers.
8. Delete the fault codes. (Refer to "[B-3] DE-
LETING THE FAULT CODES" on page
8-125.)
9. Perform a trial run. (Refer to "CHECKING
THE ABS WARNING LIGHT" on page 4-68.)
EAS22800
HYDRAULIC UNIT OPERATION TESTS
The reaction-force pulsating action generated in
the brake levers when the ABS is activated can
be tested when the vehicle is stopped.
The hydraulic unit operation can be tested using
the following two methods.
• Brake line routing confirmation: this test
checks the function of the ABS after the sys-
tem was disassembled, adjusted, or serviced.
• ABS reaction-force confirmation: this test gen-
erates the same reaction-force pulsating action
that is generated in the brake levers when the
ABS is activated.
Brake line routing confirmation
EWA13120
WARNING
Securely support the vehicle so that there is
no danger of it falling over.
TIP
• For the brake line routing confirmation, use the
diagnosis mode of the Yamaha diagnostic tool.
• Before performing the brake line routing confir-
mation, make sure that no malfunctions have
been detected in the ABS ECU and that the
wheels are not rotating.
1. Place the vehicle on a center stand.
2. Turn the main switch to "OFF".
3. Remove:
• Fuse box cover
• Upper panel
ABS (ANTI-LOCK BRAKE SYSTEM) (for YP250RA)
• Battery cover
Refer to "GENERAL CHASSIS" on page 4-1.
4. Check:
• Battery voltage
Lower than 12.8 V → Charge or replace the
battery.
Battery voltage
Higher than 12.8 V
TIP
If the battery voltage is lower than 12.8 V, charge
the battery, and then perform brake line routing
confirmation.
5. Removing the protective cap "1", and then
connect the Yamaha diagnostic tool to the
ABS test coupler (4P).
Yamaha diagnostic tool
90890-03215
6. Start the Yamaha diagnostic tool and display
the diagnosis mode screen.
7. Select code No. 2, "Brake line routing confir-
mation".
8. Click "Action" "1", and then operate the front
brake lever "2" and rear brake lever "3" simul-
taneously.
TIP
• The hydraulic unit operates 1 second after the
front brake lever and rear brake lever are oper-
ated simultaneously and continues for approx-
imately 5 seconds.
4-65
1
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