Download CHAS

ANTI-LOCK BRAKE SYSTEM (ABS)
CHAS
BASIC PROCESS FOR TROUBLESHOOTING
It does not go on.
[A]
Check the ABS
warning light.
Flashing
[B-1]
Warning light
does not
go on.
[B-3]
Warning light
keeps flashing.
Goes on for 2 seconds and goes off afterward.
Keeps going on.
[B-5]
Present
malfunction
[B-2]
Warning light
keeps going on.
[B-4]
Past
malfunction
NOTE: Display the
malfunction code
number and record it.
[C-1]
Only ABS
warning light
does not go
on.
Check
the fuse.
[C-2]
All indicator
lights do not
go on.
[C-5]
Diagnoses by
malfunction
codes.
[C-3]
Warning light
keeps flashing.
Check the
connecting parts.
Check the
brake switch
circuit.
Check the
ECU comector.
[C-4]
ABS warning light
flashes every
0.5 second.
Check the
wire harnesses.
To investigate, use
the diagnosis table
(from [C-5-1] to
[C-5-10]).
Check the
test coupler
adaptor.
Explain to the
customer.
Check the
wire harness.
ECU
[D-1]
Sensor
[D-3, 4]
Fail-safe
relay
[D-2]
HU
[D-5]
Check
the piping.
ECU
[D-1]
HU test
[D-6-3]
Are all defective phenomena corrected?
Return to [A]
Delete the malfunction
code record. [D-6-4]
End
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.
43