SERVICE BRAKES
Anti-lock Braking System Troubleshooting
When diagnostic trouble code “51 VALVE RLY” is displayed
When the ignition switch is turned ON, the ABS
normal. In addition, normally it monitors whether or
ECU switches the valve
relay
OFF and ON for an
not there is power in the valve power monitor line
initial check, compares the voltage of the signal to
since the valve relay is normally ON. Then, if the
the valve relay and valve power monitor line voltage
supply of power to the valve power monitor line is
t o c h e c k w h e t h e r t h e v a l v e
r e l a y o p e r a t i o n i s
interrupted, this diagnostic trouble code will output.
IGNITION
MAIN FUSIBLE
SWITCH
LINK
1440679
When the valve relay is
checked, are the following
conditions found?
resistance
value
No.
continuity
No continui-
t y
When battery voltage is ap-
p l i e d b e t w e e n t e r m i n a l s
No. 86 and
grounded.
continuity
no continui-
t y
Yes
the valve relay and
remove the HU connec-
No
Valve relay malfunction
Replace valve relay.
With the ignition key “ON”,
does the voltage between
HU power harness wire is
broken?
the connector terminal No.
and ground indicate bat-
tery voltage?
Repair harness.
Yes
I
Connect the HU harness
and remove the ECU con-
nector.
Does resistance between
No
Malfunction of harness
body connector terminal
between HU and ECU
and terminal
in-
dicate
ohm?
I
I
Yes
TSB Revision
Replace
ECU.
I
Содержание 1989 Galant
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