Yamaha YZF-R1 2020, Service Manual

Page: 522 / 822

ABS (Anti-lock Brake System)
9-27
EAS32893
MAINTENANCE OF THE ABS ECU
Checking the ABS ECU
1. Check:
• Terminals “1” of the hydraulic unit assembly (ABS ECU)
Cracks/damages
→
Replace the hydraulic unit assembly, brake hoses, and brake pipes that are
connected to the assembly as a set.
• Terminals “2” of the ABS ECU coupler
Connection defective, contaminated, come-off
→
Correct or clean.
TIP
If the ABS ECU coupler is clogged with mud or dirt, clean with compressed air.
EAS33284
ABS TROUBLESHOOTING OUTLINE
WARNING
EWA16710
When maintenance or checks have been performed on components related to the ABS, be sure
to perform a final check before delivering the vehicle to the customer.
TIP
To final check, refer to “[C-1] FINAL CHECK” on page 9-32.
ABS operation when the ABS warning light comes on
1. The ABS warning light remains on
→
ABS operates as a normal brake system.
• A malfunction was detected using the ABS self-diagnosis function.
• The ABS self-diagnosis has not been completed.
The ABS self-diagnosis starts when the main switch is turned to “ON” and finishes when the vehicle
has traveled at a speed of approximately 10 km/h (6 mi/h).
2. The ABS warning light comes on after the engine starts, and then goes off when the vehicle starts
moving (traveling at a speed of approximately 10 km/h (6 mi/h)).
→
ABS operation is normal.
3. The ABS warning light flashes
→
ABS operation is normal.
• Refer to “BASIC INSTRUCTIONS FOR TROUBLESHOOTING” on page 9-39.
Self-diagnosis with the ABS ECU
The ABS ECU performs a static check of the entire system when the main switch is turned to “ON”. It
also checks for malfunctions while the vehicle is ridden. Since all malfunctions are recorded after they
are detected, it is possible to check the recorded malfunction data by utilizing the YDT when the ABS
ECU has entered the self-diagnosis mode.
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