Yamaha YP250A 1999 Supplementary Service Manual page 17

Composition and operation
Fail-safe relay is composed of the solenoid relay
Solenoid relay is continued when the electronic control unit outputs the system start signal. Accordingly, the
solenoid valve is activated when the electronic control unit signals the decompression.
3
In case of malfunction, the solenoid relay is turned off and the solenoid valve is deactivated.
This makes it impossible to reduce the hydraulic pressure and resumes normal braking. Motor relay is also
continued by the signal of electronic control unit and starts the motor simultaneously when the ABS pres-
sure reduction begins.
When the solenoid is turned off, the motor relay is also turned off, therefore the motor stops its operation in
case of malfunction.
Solenoid relay
1
Motor relay
2
Solenoid valve
3
Electric control unit
4
Pomp motor relay coil
5
5. Fail-safe relay
Fail-safe relay controls the power of hydraulic unit
and it is located inside of the tail cover.
1
1
and motor relay
Pump motor monitor
6
ABS warning light
7
Fail-safe relay coil
8
Front solenoid
9
Rear solenoid
10
9
ABS OUTLINE
Fail safe relay
2
.
Power
11
Fail-safe relay
12
Hydraulic unit
13
GEN
INFO