Mitsubishi 3000gt 1997 - ABS VALVE RELAY DIAGNOSIS

35-12
SERVICE
BRAKES
-
ABS
Troubleshooting
Code
No.51
Valve
relaY
Probable
cause
o
Malfunction
of valve
relaY
.
Malfunciion
of
wiring
harness
or connector
o
Malfunction
of
ABS-ECU
o
Malfunction
of hydraulic
unit
lCommentl
i:[1!_ AgS-ECU
continually
monitors
the
solenoid
drive
circuit.
lf
no currenl
is being
sropf
,eO to i iolenoid
coil
even
though
the
solenoid
valve
relay
is.on.
or if.current
cohiinues
to be
supplied
to five
or more
solenoid
coils even
thougn
_tne
solenolo
valve
relay
is off,
the
ABS-ECU
judges
thal there
is a
problem
wltn
tne Ats5
valve
relay.
Thi6 diagnosis
code
is then
output.
Check
the
harness
between
fusible
link No.7
and
valve
relay,
and
repair
if
necessary.
Measure
at
valve
relay connector
A-
94.
.
Disconnect
the connector
and
mea-
sure at
the
harness
side.
.
Voltage
between
5
-
bodY
earth
OK:
System
voltage
Check
the
tollowing
connectors.
A-94 and
C-94
or C-96
Measure
at
ABS-ECU
connector
E-10.
o
Disconnect
the connector
and
measure
at
the
harness
side.
.
Resistance
between
82-47
OK:60-120O
Solenoid
valve
insPection
(Refer
to
P.35-21.)
Measure
at
hydraulic
unit
connector
A-
78 and
ABS-ECU
connectors
E-10.
.
Disconnect
the connector
and
measure
at
the
harness side.
.
Continuity
between
the
following
terminals
OK:
Continuity
HU SidE
ABS.ECU
side
HU
side
ABS-ECU
side
1234
3|o
311
t|u ?1,
5678
5|u
51,
5|o
J,
Check
the
following
connectors'
A-77 and
A-94
Measure
at
hydraulic
unit
connector
A-
77 and
valve
ielay
connector
A-94.
.
Disconnect
the connector
and
mea-
sure at
the
harness
side.
.
Continuity
between
the
following
terminals
OK:
Continuity
HU side
11
Check
the
harness
between
the
hY-
draulic
unit and
valve
relay, and
repair
if necessary.
Reolace
the
ABS-ECU.
Check
the
following
connectors.
A-78,C-25
and
E-10
Check
the
harness
between
the
hY-
draulic
unit
and
ABS-ECU,
and
repair
It necessary.
Replace
the
valve
relaY.
Check
the
harness
between
valve
relay
and
ABS-ECU,
and
rePair
if
necessary.