Subaru Legacy III (2000-2003 year). Manual - part 723

ABS-110

ABS (DIAGNOSTICS)

DIAGNOSTICS CHART WITH SUBARU SELECT MONITOR

S: DTC 38 REAR LEFT OUTLET VALVE MALFUNCTION

DIAGNOSIS:
• Faulty harness/connector
• Faulty outlet solenoid valve
TROUBLE SYMPTOM:
• ABS does not operate.
WIRING DIAGRAM:

ABS00294

1

23

ABS CONTROL MODULE AND HYDRAULIC CONTROL UNIT

F49

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

F49

BATTERY

NO

. 18 15A

SBF-4 50A

SBF-1 100A

GENERATOR

IGNITION 
SWITCH

ABS-111

ABS (DIAGNOSTICS)

DIAGNOSTICS CHART WITH SUBARU SELECT MONITOR

Step

Value

Yes

No

1

CHECK INPUT VOLTAGE OF ABSCM&H/U.
1) Turn ignition switch to OFF.
2) Disconnect connector from ABSCM&H/U.
3) Run the engine at idle.
4) Measure voltage between ABSCM&H/U 

connector and chassis ground.

Connector & terminal

(F49) No. 1 (+) — Chassis ground (

−−−−

):

Is the measured value within the specified 
range?

10 - 15 V

Go to step 2.

Repair harness 
connector 
between battery, 
ignition switch and 
ABSCM&H/U.

2

CHECK GROUND CIRCUIT OF ABSCM&H/U.
1) Turn ignition switch to OFF.
2) Measure resistance between ABSCM&H/U 

connector and chassis ground.

Connector & terminal

(F49) No. 23 — Chassis ground:

Is the measured value less than the speci-
fied value?

0.5 

Ω

Go to step 3.

Repair 
ABSCM&H/U 
ground harness.

3

CHECK POOR CONTACT IN CONNECTORS.
Is there poor contact in connectors between 
generator, battery and ABSCM&H/U?

There is no poor contact.

Go to step 4.

Repair connector.

4

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 as in the current diagno-
sis still being output?

Same DTC is not indicated.

Go to step 5.

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

5

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.

ABS-112

ABS (DIAGNOSTICS)

DIAGNOSTICS CHART WITH SUBARU SELECT MONITOR

T: DTC 41 ABS CONTROL MODULE MALFUNCTION

DIAGNOSIS:
• Faulty ABSCM&H/U
TROUBLE SYMPTOM:
• ABS does not operate.
WIRING DIAGRAM:

Step

Value

Yes

No

1

CHECK GROUND CIRCUIT OF ABSCM&H/U.
1) Turn ignition switch to OFF.
2) Disconnect connector from ABSCM&H/U.
3) Measure resistance between ABSCM&H/U 

and chassis ground.

Connector & terminal

(F49) No. 23 — Chassis ground:

Is the measured value less than the speci-
fied value?

 0.5 

Ω

Go to step 2.

Repair 
ABSCM&H/U 
ground harness.

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

F49

23

ABS CONTROL MODULE AND 

HYDRAULIC CONTROL UNIT

F49

ABS00295

ABS-113

ABS (DIAGNOSTICS)

DIAGNOSTICS CHART WITH SUBARU SELECT MONITOR

2

CHECK POOR CONTACT IN CONNECTORS.
Is there poor contact in connectors between 
battery, ignition switch and ABSCM&H/U? 

There is no poor contact.

Go to step 3.

Repair connector.

3

CHECK SOURCES OF SIGNAL NOISE.
Is the car telephone or the wireless transmitter 
properly installed?

Installed properly.

Go to step 4.

Properly install the 
car telephone or 
the wireless trans-
mitter.

4

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.

Go to step 5.

Install the noise 
sources apart from 
the sensor har-
ness.

5

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 as in the current diagno-
sis still being output?

Same DTC is not indicated.

Go to step 6.

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

6

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