Subaru Legacy III (2000-2003 year). Service manual — part 720
ABS-98
ABS (DIAGNOSTICS)
DIAGNOSTICS CHART WITH SUBARU SELECT MONITOR
19
CHECK GROUND CIRCUIT OF ABSCM&H/U.
Measure resistance between ABSCM&H/U
and chassis ground.
Connector & terminal
(F49) No. 23 — GND:
Is the measured value less than the specified
value?
0.5
Ω
Repair
ABSCM&H/U
ground harness.
20
CHECK POOR CONTACT IN CONNECTORS.
Is there poor contact in connectors between
ABSCM&H/U and ABS sensor?
There is no poor contact.
Repair connector.
21
CHECK SOURCES OF SIGNAL NOISE.
Is the car telephone or the wireless transmitter
properly installed?
Installed properly.
Properly install the
car telephone or
the wireless trans-
mitter.
22
CHECK SOURCES OF SIGNAL NOISE.
Are noise sources (such as an antenna)
installed near the sensor harness?
Noise source is not installed
near the sensor harness.
Install the noise
sources apart from
the sensor har-
ness.
23
CHECK SHIELD CIRCUIT.
1) Connect all connectors.
2) Measure resistance between shield con-
nector and chassis ground.
Connector & terminal
DTC 22 / LHD: (F45) No. 13 — Chassis
ground:
RHD: (F2) No. 14 — Chassis ground:
DTC 24 / LHD: (F45) No. 10 — Chassis
ground:
RHD: (F2) No. 17 — Chassis ground:
Is the measured value less than the speci-
fied value?
NOTE:
For the DTC 26 and 28:
Go to step 24.
0.5
Ω
Repair shield har-
ness.
24
CHECK ABSCM&H/U.
1) Connect all connectors.
2) Erase the memory.
3) Perform inspection mode.
4) Read out the DTC.
Is the same DTC still being output?
Same DTC is not indicated.
Replace
ABSCM&H/U.
<Ref. to ABS-6,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
25
CHECK ANY OTHER DTC APPEARANCE.
Are other DTC being output?
Other DTC is not indicated.
A temporary noise
interference.
Proceed with the
diagnosis corre-
sponding to the
DTC.
Step
Value
Yes
No
ABS-99
ABS (DIAGNOSTICS)
DIAGNOSTICS CHART WITH SUBARU SELECT MONITOR
MEMO:
ABS-100
ABS (DIAGNOSTICS)
DIAGNOSTICS CHART WITH SUBARU SELECT MONITOR
K: DTC 29 ABNORMAL ABS SENSOR SIGNAL ON ANY ONE OF FOUR SEN-
SOR
DIAGNOSIS:
• Faulty ABS sensor signal (noise, irregular signal, etc.)
• Faulty tone wheel
• Wheels turning freely for a long time
TROUBLE SYMPTOM:
• ABS does not operate.
WIRING DIAGRAM:
ABS00309
R73
R72
F49
FRONT
ABS
SENSOR LH
FRONT
ABS
SENSOR RH
ABS CONTROL MODULE AND HYDRAULIC CONTROL UNIT
F49
2
1
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
16 17 18 19 20 21 22
27 28 29 30 31
23
24
25
26
9
10
11
12
1
2
1
2
1
4
7
8
1
2
5
6
14
15
1
2
23
F55
R49
B15
B6
R73
R72
REAR
ABS
SENSOR LH
REAR
ABS
SENSOR RH
B6
B15
F55
15
16
14
12
13
17
8
9
13
11
12
10
F45
1
*
2
*
RHD
LHD
1
*
2
*
: LHD
RHD
: LHD
RHD B100
B62
F2
F45
1 2 3
4 5 6 7
8 9 10 11
12 13 14 15 16
1
2 3
4 5 6 7 8
F2
3 4
1 2
8 9 10 11
12 13 14 15 16 17 18 19 20 21 22 23 24
5 6
7
ABS-101
ABS (DIAGNOSTICS)
DIAGNOSTICS CHART WITH SUBARU SELECT MONITOR
Step
Value
Yes
No
1
CHECK WHEELS FOR FREE TURNING.
Have wheels been turned freely for more than
one minute, such as when the vehicle is
jacked-up, under full-lock cornering or when
tire is not in contact with road surface.
Wheels have not turned freely. Go to step 2.
The ABS is nor-
mal. Erase the
diagnostic trouble
code.
NOTE:
When the wheels
turn freely for a
long time, such as
when the vehicle is
towed or jacked-
up, or when steer-
ing wheel is contin-
uously turned all
the way, this trou-
ble code may
sometimes occur.
2
CHECK TIRE SPECIFICATIONS.
Turn ignition switch to OFF.
Are the tire specifications correct?
Correct specification.
Replace tire.
3
CHECK WEAR OF TIRE.
Is the tire worn excessively?
Not worn excessively.
Replace tire.
4
CHECK TIRE PRESSURE.
Is the tire pressure correct?
Correct tire pressure.
Adjust tire pres-
sure.
5
CHECK INSTALLATION OF ABS SENSOR.
Are the ABS sensor installation bolts tightened
with the specified torque?
33
±
10 N·m (3.4
±
1.0 kgf-m,
25
±
7 ft-lb)
Tighten ABS sen-
sor installation
bolts securely.
6
CHECK ABS SENSOR GAP.
Measure tone wheel to ABS sensor piece gap
over entire perimeter of the wheel.
Is the measured value within the specified
range?
Front wheel 0.3 — 0.8 mm
(0.012 — 0.031 in) and Rear
wheel 0.44 — 0.94 mm
(0.0173 — 0.0370 in)
Adjust the gap.
NOTE:
Adjust the gap us-
ing spacer (Part
No. 26755AA000).
If spacers cannot
correct the gap, re-
place worn sensor
or worn tone
wheel.
7
PREPARE OSCILLOSCOPE.
Is an oscilloscope available?
Available.
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