Subaru Legacy III (2000-2003 year). Service manual — part 708
ABS-50
ABS (DIAGNOSTICS)
DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
L: DTC 29 ABNORMAL ABS SENSOR SIGNAL (ANY ONE OF FOUR)
DIAGNOSIS:
• Faulty ABS sensor signal (noise, irregular signal, etc.)
• Faulty tone wheel
• Turning wheels 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-51
ABS (DIAGNOSTICS)
DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
Step
Value
Yes
No
1
CHECK IF THE WHEELS HAVE TURNED
FREELY.
Check if the wheels have been turned freely for
more than one minute, such as when the vehi-
cle 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.
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.
The ABS is nor-
mal. Erase the
DTC.
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.
Tightening torque:
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.
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.
ABS-52
ABS (DIAGNOSTICS)
DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
8
CHECK ABS SENSOR SIGNAL.
1) Lift up the vehicle.
2) Turn ignition switch OFF.
3) Connect the oscilloscope to the connector.
4) Turn ignition switch ON.
5) Rotate wheels and measure voltage at
specified frequency. <Ref. to ABS-15,
WAVEFORM, Control Module I/O Signal.>
NOTE:
When this inspection is completed, the AB-
SCM&H/U sometimes stores the DTC 29.
Connector & terminal
Front RH
LHD: (F45) No. 11 (+) — No. 12 (
−−−−
):
RHD: (F2) No. 12 (+) — No. 13 (
−−−−
):
Front LH
LHD: (F45) No. 8 (+) — No. 9 (
−−−−
):
RHD: (F2) No. 15 (+) — No. 16 (
−−−−
):
Rear RH
(F55) No. 5 (+) — No. 6 (
−−−−
):
Rear LH
(F55) No. 1 (+) — No. 4 (
−−−−
):
Is the measured value same with the speci-
fied value?
Oscilloscope pattern is as
shown in figure.
9
CHECK CONTAMINATION OF ABS SENSOR
OR TONE WHEEL.
Remove disc rotor from hub.
Is the ABS sensor piece or the tone wheel con-
taminated by dirt or other foreign matter?
ABS sensor piece or the tone
wheel is not contaminated.
Thoroughly
remove dirt or
other foreign mat-
ter.
10
CHECK DAMAGE OF ABS SENSOR OR
TONE WHEEL.
Are there broken or damaged teeth in the ABS
sensor piece or the tone wheel?
Not broken or damaged.
Replace ABS sen-
sor or tone wheel.
Front: <Ref. to
ABS-12, Front
ABS Sensor.>
Rear: <Ref. to
ABS-15, Rear
ABS Sensor.>
and Front: <Ref.
to ABS-19, Front
Tone Wheel.>
Rear: <Ref. to
ABS-20, Rear
Tone Wheel.>
11
CHECK TONE WHEEL RUNOUT.
Measure tone wheel runout.
Is the measured value less than the specified
value?
0.05 mm (0.0020 in)
Replace tone
wheel. Front:
<Ref. to ABS-19,
Front Tone
Wheel.> Rear:
<Ref. to ABS-20,
Rear Tone
Wheel.>
12
CHECK ABSCM&H/U.
1) Turn ignition switch to OFF.
2) Connect all connectors.
3) Erase the memory.
4) Perform inspection mode.
5) 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).>
Step
Value
Yes
No
ABS-53
ABS (DIAGNOSTICS)
DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
13
CHECK ANY OTHER DTC APPEARANCE.
Are other DTC being output?
Other DTC is not indicated.
A temporary poor
contact.
Proceed with the
diagnosis corre-
sponding to the
DTC.
Step
Value
Yes
No
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