Basic Process For Troubleshooting - Yamaha YP250A 1999 Supplementary Service Manual

BASIC PROCESS FOR TROUBLESHOOTING

It does not go on.
[B-1]
Warning light
does not
go on.
[C-1] [C-2]
Only ABS
All indicator
warning light
lights do not
does not go
go on.
on.
Check the
Check
connect-
the fuse.
ing parts.
ECU
[D-1]
Return to [A]
NOTE:
Do not delete the malfunction code during the troubleshooting procedures. Be sure to delete it when the
service is finished.
WARNING
Always execute the "final check" when the components related to ABS are checked and serviced.
ANTI-LOCK BRAKE SYSTEM (ABS)
[A]
Check the ABS
warning light.
Flashing
[B-3]
[B-2]
Warning light
Warning light
keeps flashing. keeps going on.
[C-3]
Warning light
keeps flashing.
Check the
brake switch
circuit.
Check the
test coupler
adaptor.
Sensor
[D-3, 4]
Are all defective phenomena corrected?
Delete the malfunction
code record. [D-6-4]
Goes on for 2 seconds and goes off afterward.
Keeps going on.
[B-5]
Present
malfunction
NOTE: Display the
malfunction code
number and record it.
[C-5]
Diagnoses by
malfunction
codes.
Check the
ECU com-
ector.
To investigate, use
the diagnosis table
(from [C-5-1] to
[C-5-10]).
Check the
wire harness.
Fail-safe
relay
[D-2]
Check
the piping.
End
43
CHAS
[B-4]
Past
malfunction
[C-4]
ABS warning light
flashes every
0.5 second.
Check the
wire har-
nesses.
Explain to the
customer.
HU ECU
[D-5] [D-1]
HU test
[D-6-3]