Yamaha YZF-R1 Series Service Manual page 517

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TIP
The ABS performs a self-diagnosis test for a few seconds each time the vehicle first starts off after the
main switch was turned to "ON". During this test, a "clicking" noise can be heard from under the seat,
and if the brake lever or brake pedal are even slightly applied, a vibration can be felt at the lever and
pedal, but these do not indicate a malfunction.
Special precautions for handling and servicing a vehicle equipped with ABS
ECA17620
NOTICE
Care should be taken not to damage components by subjecting them to shocks or pulling on
them with too much force since the ABS components are precisely adjusted.
• The ABS ECU and hydraulic unit are united assemblies and cannot be disassembled.
• The malfunction history is stored in the memory of the ABS ECU. Delete the DTC when the service is
finished. (This is because the past DTC will be displayed again if another malfunction occurs.)
EAS32895
BASIC INSTRUCTIONS FOR TROUBLESHOOTING
1. Check the DTC of "malfunction" using the YDT.
2. Check and repair the malfunction according to applicable DTC troubleshooting.
3. Turn the main switch from "OFF" to "ON", and then check the DTC of "malfunction" is not displayed.
TIP
• If another DTC is displayed, repeat steps (1) to (3) until no DTC is displayed.
• Turning the main switch to "OFF" will not erase the malfunction history.
4. Do the final check.
EWA17420
WARNING
• Perform the troubleshooting [A]→[B]→[C] in order. Be sure to follow the order since a wrong
diagnosis could result if the steps are followed in a different order or omitted.
• Use sufficiently charged regular batteries only.
ABS (Anti-lock Brake System)
9-20

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