Yamaha R1 Series 2015, Service Manual, Page: 34 / 704

FEATURES
1-25
ABS ECU
The ABS ECU is integrated with the hydraulic unit to achieve a compact and lightweight design. As
shown in the following block diagram, the ABS ECU receives wheel sensor signals from the front and
rear wheels and also receives signals from other monitor circuits.
The necessary actions are confirmed using the monitor circuit and control signals are transmitted to the
hydraulic unit assembly.
ABS control operation
The ABS control operation performed in the ABS ECU is divided into the following two parts.
•
Hydraulic control
• Self-diagnosis
When a malfunction is detected in the ABS, a fault code is stored in the memory of the ABS ECU for
easy problem identification and troubleshooting.
TIP
•
Some types of malfunctions are not recorded in the memory of the ABS ECU (e.g., a blown ABS so-
lenoid fuse).
5
4
7
8
2 3
1
11 10
9
12
13
14
16
23
19 21 22 20
26
24
27
28
29
30
31
17 18
15
25
6
1. Battery
2. AC magneto
3. Rectifier/regulator
4. Main fuse
5. ABS motor fuse
6. ABS solenoid fuse
7. Main switch
8. ABS ECU fuse
9. Signaling system fuse
10.Front brake light switch
11.Rear brake light switch
12.Tail/brake light
13.Hydraulic unit assembly
14.ABS ECU
15.Solenoid relay
16.ABS motor relay
17.Front brake inlet solenoid
18.Front brake outlet solenoid
19.Rear brake inlet solenoid
20.Rear brake outlet solenoid
21.Unified brake system inlet solenoid
22.Unified brake system outlet solenoid
23.ABS motor
24.ECU (Engine Control Unit)
25.Meter assembly
26.ABS warning light
27.Speedometer
28.IMU (Inertial Measurement Unit)
29.Yamaha diagnostic tool coupler
30.Rear wheel sensor
31.Front wheel sensor