Yamaha FZ 25 2021, Supplementary Service Manual

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6-77
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ELEC
ABS (ANTI-LOCK BRAKE SYSTEM)
EWA16710
WARNING
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 6-102.
EAS30531
[A] CHECKING THE ABS WARNING LIGHT
Turn the main switch to “ON”. (Do not start the engine.)
1. The ABS warning light does not come on.
• Only the ABS warning light fails to come on. [A-1]
• The ABS warning light and all other indicator lights fail to come on. [A-2]
2. The ABS warning light comes on. [A-3]
EAS30532
[A-1] ONLY THE ABS WARNING LIGHT FAILS TO COME ON
1. Check for a short circuit to the ground between the white/blue terminal of the ABS ECU coupler and
white/blue terminal of the meter assembly.
• If there is short circuit to the ground, the wire harness is defective. Replace the wire harness.
2. Disconnect the ABS ECU coupler and check that the ABS warning light comes on when the main
switch is turned to “ON”.
• If the ABS warning light does not come on, the meter assembly circuit (including the ABS warning
light [LED]) is defective. Replace the meter assembly.
• If the ABS warning light comes on, the ABS ECU is defective. Replace the hydraulic unit assembly.
EAS30964
[A-2] ALL INDICATOR LIGHTS FAIL TO COME ON
1. Main switch
• Check the main switch for continuity.
Refer to “CHECKING THE SWITCHES” on page 6-105.
• If there is no continuity, replace the main switch.
2. Battery
• Check the condition of the battery.
Refer to “CHECKING AND CHARGING THE BATTERY” in base service manual B97-F8197-E0 on
page 7-62.
• If the battery is defective, clean the battery terminals and recharge it, or replace the battery.
3. Main fuse
• Check the fuse for continuity.
Refer to “CHECKING THE FUSES” on page 6-106.
• If the main fuse is blown, replace the fuse.
4. Circuit
• Check the meter assembly circuit.
Refer to “Signaling system” CIRCUIT DIAGRAM (For FAZER25-ABS) on page 6-16.
• If the meter assembly circuit is open, replace the wire harness.
EAS31162
[A-3] THE ABS WARNING LIGHT COMES ON
Connect the Yamaha diagnostic tool to the ABS test coupler and execute functional diagnosis. (For in-
formation about how to execute functional diagnosis, refer to the operation manual that is included with
the tool.)
Check that communication with the ABS ECU is possible.
• Only the ABS ECU fails to communicate. [A-4]
B9X-F8197-E0.book Page 77 Thursday, July 16, 2020 2:28 PM