Subaru Legacy III (2000-2003 year). Service manual — part 717

ABS-86

ABS (DIAGNOSTICS)

DIAGNOSTICS CHART WITH SUBARU SELECT MONITOR

C: DTC 21 OPEN OR SHORT CIRCUIT IN FRONT RIGHT ABS SENSOR CIRCUIT

NOTE:
For the diagnostic procedure, refer to DTC 27. <Ref. to ABS-88, DTC 27 OPEN OR SHORT CIRCUIT IN
REAR LEFT ABS SENSOR CIRCUIT, Diagnostics Chart with Subaru Select Monitor.>

D: DTC 23 OPEN OR SHORT CIRCUIT IN FRONT LEFT ABS SENSOR CIRCUIT

NOTE:
For the diagnostic procedure, refer to DTC 27. <Ref. to ABS-88, DTC 27 OPEN OR SHORT CIRCUIT IN
REAR LEFT ABS SENSOR CIRCUIT, Diagnostics Chart with Subaru Select Monitor.>

E: DTC 25 OPEN OR SHORT CIRCUIT IN REAR RIGHT ABS SENSOR CIRCUIT

NOTE:
For the diagnostic procedure, refer to DTC 27. <Ref. to ABS-88, DTC 27 OPEN OR SHORT CIRCUIT IN
REAR LEFT ABS SENSOR CIRCUIT, Diagnostics Chart with Subaru Select Monitor.>

ABS-87

ABS (DIAGNOSTICS)

DIAGNOSTICS CHART WITH SUBARU SELECT MONITOR

MEMO:

ABS-88

ABS (DIAGNOSTICS)

DIAGNOSTICS CHART WITH SUBARU SELECT MONITOR

F: DTC 27 OPEN OR SHORT CIRCUIT IN REAR LEFT ABS SENSOR CIRCUIT

DIAGNOSIS:
• Faulty ABS sensor (Broken wire, input voltage too high)
• Faulty harness connector
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-89

ABS (DIAGNOSTICS)

DIAGNOSTICS CHART WITH SUBARU SELECT MONITOR

Step

Value

Yes

No

1

CHECK OUTPUT OF ABS SENSOR USING
SELECT MONITOR.
1) Select “Current data display & Save” on the

select monitor.

2) Read the ABS sensor output corresponding

to the faulty system in the select monitor
data display mode.
Does the speed indicated on the display
change in response to the speedometer
reading during acceleration/deceleration
when the steering wheel is in the straight-
ahead position?

Change as same.

Go to step 2.

Go to step 8.

2

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)

Go to step 3.

Tighten ABS sen-
sor installation
bolts securely.

3

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)

Go to step 4.

Adjust the gap.

NOTE:
Adjust the gap us-
ing spacers (Part
No. 26755AA000).
If spacers cannot
correct the gap, re-
place worn sensor
or worn tone
wheel.

4

CHECK TONE WHEEL RUNOUT.
Measure tone wheel runout.
Is the measured value less than the specified
value?

0.05 mm (0.0020 in)

Go to step 5.

Replace tone
wheel. Front:
<Ref. to ABS-19,
Front Tone
Wheel.> Rear:
<Ref. to ABS-20,
Rear Tone
Wheel.>

5

CHECK POOR CONTACT IN CONNECTORS.
Turn ignition switch to OFF.
Is there poor contact in connectors between
ABSCM&H/U and ABS sensor?

There is no poor contact.

Go to step 6.

Repair connector.

6

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.

Go to step 7.

Replace
ABSCM&H/U.
<Ref. to ABS-6,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>

7

CHECK ANY OTHER DTC APPEARANCE.
Are other DTC being output?

Other DTC is not indicated.

A temporary poor
contact.

NOTE:
Check harness
and connectors
between AB-
SCM&H/U and
ABS sensor.

Proceed with the
diagnosis corre-
sponding to the
DTC.