Yamaha XP500, Service Manual

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CHAS
ANTI-LOCK BRAKE SYSTEM (XP500A)
EAS00886
Basic troubleshooting process
NOTE:
_
Do not delete the malfunction codes during troubleshooting. Delete the malfunction codes only after service
has been completed.
WARNING
_
When maintenance or checks have been performed on components related to the ABS, be sure to per-
form a final check before delivering the vehicle to the customer. (Refer to “[D-6] Final check”.)
[A]
Check the ABS warning
light.
Does not come on. Comes on for 2 seconds, then goes off.
Flashing Remains on.
[B-1]
Warning light does
not come on. [B-3]
Warning light
keeps flashing. [B-2]
Warning light
remains on. [B-5]
Present
malfunction [B-4]
Past
malfunction
YES
NOTE: Display the
malfunction code
number and record it.
YES NO NO
Check the
fuse.
[C-2]
All indicator
lights do not
come on.
[C-3]
Warning light
flashes continu-
ously. [C-5]
Diagnose by
malfunction
codes. [C-4]
ABS warning light
flashes every
0.5 second.
Check the
connectors
and couplers.
Check the
brake switch
circuit.
Check the
ECU (ABS)
connector. Check the wire
harnesses (ABS
system’s circuit).
[C-1]
Only ABS warn-
ing light does
not come on.
Check the
test coupler
adaptor.
For details, use the diag-
nostic codes listed from
[C-5-1] to [C-5-13].
Normal
Check the wire harnesses
(ABS system’s circuit).
[D-1]
ECU (ABS)
[D-3, D-4]
Sensor
[D-2]
Fail-safe relay
[D-5]
Hydraulic unit
[D-1]
ECU (ABS)
Check the
hose routing.
Hydraulic unit test
[D-6-3-1] [D-6-3-2]
Not
OK
Have all problems been corrected?
OK
[D-6-4] Delete the mal-
function code record.
Return to [A]
Finished
OK NO
[D-6-6] Delete function test
Cannot delete
Delete
OK