Yamaha MTN850-A 2017 Service Manual page 200

firmed using the indicator.
On: The hydraulic unit is operating.
Flashing: The conditions for operating the hy-
draulic unit have not been met.
Off: The brake lever and brake pedal are not
being operated.
1
2
9. Check:
• Hydraulic unit operation
Click "Actuator Check", a single pulse will be
generated in the brake lever "1", brake pedal
"2", and again in the brake lever "1", in this or-
der.
TIP
"ON" and "OFF" on the tool screen indicate
when the brakes are being applied and released
respectively.
ECA17371
NOTICE
• Check that the pulse is felt in the brake le-
ver, brake pedal, and again in the brake le-
ver, in this order.
• If the pulse is felt in the brake pedal before
ABS (ANTI-LOCK BRAKE SYSTEM)
3
4-55
it is felt in the brake lever, check that the
brake hoses and brake pipes are connected
correctly to the hydraulic unit assembly.
• If the pulse is hardly felt in either the brake
lever or brake pedal, check that the brake
hoses and brake pipes are connected cor-
rectly to the hydraulic unit assembly.
10.If the operation of the hydraulic unit is normal,
delete all of the fault codes.
ABS reaction-force confirmation
EWA13120
WARNING
Securely support the vehicle so that there is
no danger of it falling over.
TIP
• For the ABS reaction-force confirmation, use
the diagnosis of function of the Yamaha diag-
nostic tool. For more information, refer to the
operation manual of the Yamaha diagnostic
tool.
• Before performing the ABS reaction-force con-
firmation, 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 maintenance stand.
2. Turn the main switch to "OFF".
3. Remove:
• Rider seat
Refer to "GENERAL CHASSIS (1)" 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 ABS reaction-
force confirmation.