35-24
SERVICE BRAKES
Anti-lock Braking System Troubleshooting
ABS warning light illuminated after the engine is started and remains on.
[Explanation]
This is the symptom when the ABS ECU does not
power up due to broken ECU power circuit, etc.,
when the fail safe function operates and isolates the
system or when the warning light drive circuit is
short circuited.
Check the on-board diagnostic output and if there is
no output voltage or if the scan tool and
ABS ECU
cannot communicate, there is a good possibility
that power is not flowing to the ECU.
Caution
l
If there is no output of diagnostic trouble
codes, there is a good possibility that the
fail safe is functioning.
J/B
IGNITION
7
8
Is there on-board diagnostic
output? (Is there
cation with scan tool?)
CONTINUE TO
NEXT PAGE
Yes
TSB Revision
Does the ABS warning light
remain
illuminated
even
with the ECU connector dis-
connected?
Yes
No
Short in ECU transistor
Replace ECU.
I
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