Subaru Legacy III (2000-2003 year). Service manual — part 721

ABS-102

ABS (DIAGNOSTICS)

DIAGNOSTICS CHART WITH SUBARU SELECT MONITOR

8

CHECK ABS SENSOR SIGNAL.
1) Lift up the vehicle.
2) Turn ignition switch to OFF.
3) Connect the oscilloscope to the connector

(B62) in accordance with trouble code.

4) Turn ignition switch to 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 as the speci-
fied value?

Oscilloscope pattern is as
shown in figure.

Go to step 12.

Go to step 9.

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 mud or other foreign matter?

ABS sensor piece or the tone
wheel is not contaminated.

Go to step 10.

Thoroughly
remove mud 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.

Go to step 11.

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)

Go to step 12.

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.

Go to step 13.

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

Step

Value

Yes

No

ABS-103

ABS (DIAGNOSTICS)

DIAGNOSTICS CHART WITH SUBARU SELECT MONITOR

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

ABS-104

ABS (DIAGNOSTICS)

DIAGNOSTICS CHART WITH SUBARU SELECT MONITOR

L: DTC 31 FRONT RIGHT INLET VALVE MALFUNCTION

NOTE:
For the diagnostic procedure, refer to DTC 37. <Ref. to ABS-106, DTC 37 REAR LEFT INLET VALVE MAL-
FUNCTION, Diagnostics Chart with Subaru Select Monitor.>

M: DTC 33 FRONT LEFT INLET VALVE MALFUNCTION

NOTE:
For the diagnostic procedure, refer to DTC 37. <Ref. to ABS-106, DTC 37 REAR LEFT INLET VALVE MAL-
FUNCTION, Diagnostics Chart with Subaru Select Monitor.>

N: DTC 35 REAR RIGHT INLET VALVE MALFUNCTION

NOTE:
For the diagnostic procedure, refer to DTC 37. <Ref. to ABS-106, DTC 37 REAR LEFT INLET VALVE MAL-
FUNCTION, Diagnostics Chart with Subaru Select Monitor.>

ABS-105

ABS (DIAGNOSTICS)

DIAGNOSTICS CHART WITH SUBARU SELECT MONITOR

MEMO: