SERVICE BRAKES
Anti-lock Braking System Troubleshooting
ABS warning light does not illuminate when ignition key is in “START” position.
[Explanation]
The ABS ECU uses the
power source which is
t u r n e d o f f i n t h e “ S T A R T ” p o s i t i o n . T h e
warning light
uses the
power source which is
n o t t u r n e d o f f e v e n i n t h e “ S T A R T ” p o s i t i o n .
Consequently, in the “START” position, power is off
a n d t h e E C U t u r n s t h e v a l v e r e l a y O F F . I f t h e
warning light does not illuminate at this time, there
is
trouble in the warning light circuit on the valve
relay side.
MAIN
IGNITION
FUSIBLE
LINK
1 4 4 0 6 7 7
Remove and inspect
pin connectors of
the hydraulic unit.
With the ignition key in the
No
“ON” position, does voltage
Harness wire between
HU and warning light is
between body connector
broken.
terminal
and ground
indicate the battery voltage?
Yes
TSB Revision
Is there continuity between ,
No
body connector terminal
. Broken line between HU
and ground?
and body ground
Remove the valve relay. Is
there continuity between
Valve relay malfunction
terminal No.
and No.
Replace valve relay.
I
HU harness malfunction
Replace HU.
I
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