Mitsubishi 3000gt 1997 - ABS SENSOR AND CIRCUIT DIAGNOSIS; Wheel Speed Sensor Short Circuit (Codes 21-24); G-Sensor System Faults (Code 26)

SERVICE BRAKES
-
ABS Troubteshooting
35-9
Code No.21
,22,23,24
Wheel
speed
sensor
short
circuit Probable
cause
These
codes
are output
at the followinq
times:
o
When
an open
circuit cannot
be fou'nd,
but more
than one wheel
speed
sensor
does
not
output
any signal
during
driving
at 8
km/h
or higher.
.
Wnen
a chrpped
or
ptugged-up
rotor
tooth,
etc. is detected.
.
When the
sensor output
drops
and anti-lock
control is
continuouslv
carried out
due to
a defective
sensor or
a
waroed
rotor.
.
Malfunction
of wheel
speed
sensor
o
Malfunction
of rotor
o
Malfunction
of wheel
bearino
o
Malfunction
of wiring
harnesi
or
connector
.
Malfunction
of ABS-ECU
Measure
at the ABS-ECU
connectors
E-1 0.
.
Disconnect
the connector
and mea-
sure
from
the harness
side.
.
Resistance values
between
46
and
73,
69 and 70,71
and 72,74
and
OK: 1.4
-
1.8 kf)
Check
the following
connectors.
A-12, A-33,
C-26, E-13
and
E-15
Check the harness
wire
between
each
wheel
speed sensor
and ABS-ECU,
and repair
if necessary.
Replace
the wheel
speed
sensor.
Replace
the rotor.
Code No.26
G-sensor
system
(open-,
short-circuited
or
signal
abnormal)
Probable
cause
Output is
provided
in
the following
cases.
.
G-sensor output
drops
below 0.5V or rises
above 4.5V
.
G-sensor
system harness
is
broken or shorted
o
G-sensor
defective
.
Harness
and
connector defective
o
ABS-ECU
defective
,s,
Replace
G-sensor
Replace
ABS-ECU.
Check
G-sensor.
(Refer
to P.35-22.)
Measure
at ABS-ECU
connector E-1
0.
o
Disconnect
connectors
and make
measure.
ments
on harness
side.
.
lgnition
switch:
ON
.
Voltage
between
No.62
and 45
OK: 2.3-2.7
V
Check the following
connector.
D-27
Check harness
between
G-sensor and ABS-
ECU,
and repair
if necessary.
Check the
following
connector.
E-10
Check trouble
symptoms.
;
&