Subaru Legacy (2005 year). Manual - part 773

ABS(diag)-57

ABS (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

WIRING DIAGRAM:

ABS00622

MAIN SBF

SBF-6

No.33

B301

E

E

15

18

ABSCM & H/U

B301

1 2 3 4 5 6 7 8 9 10 11

16 17 18 19 20 21 22 23 24 25 26

13

12

15

14

BATTERY

IGNITION
SWITCH

GENERATOR

ABS(diag)-58

ABS (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

Step

Check

Yes

No

1

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

Connector & terminal

(B301) No. 18 (+) — Chassis ground (

−

):

Is the voltage 10 — 15 V?

Go to step 2.

Repair the 
ABSCM&H/U 
power circuit.

2

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

Connector & terminal

(B301) No. 15 — Chassis ground:

Is the resistance less than 0.5 
Ω?

Go to step 3.

Repair the 
ABSCM&H/U 
ground harness.

3

CHECK POOR CONTACT IN CONNECTOR. Is there poor contact in con-

nector between generator, bat-
tery and ABSCM&H/U?

Repair the con-
nector.

Go to step 4.

4

CHECK ABSCM&H/U.
1) Connect all the connectors.
2) Perform clear memory mode.
3) Perform the inspection mode.
4) Read the DTC.

Is the same DTC displayed?

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

Go to step 5.

5

CHECK ANY OTHER DTC ON DISPLAY.

Is any other DTC displayed?

Inspect the DTC 
using “List of Diag-
nostic Trouble 
Code (DTC)”. 
<Ref. to 
ABS(diag)-38, List 
of Diagnostic Trou-
ble Code (DTC).>

Temporary poor 
contact occurs.

ABS(diag)-59

ABS (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

R: DTC C0110 ABS CONTROL MODULE MALFUNCTION

DTC DETECTING CONDITION:
Defective ABSCM&H/U
TROUBLE SYMPTOM:
• ABS does not operate.
• EBD does not operate.

NOTE:
Brake warning light comes on as well as ABS warning light.
WIRING DIAGRAM:

ABS00415

E

ABSCM & H/U

B301

15

B301

1 2 3 4 5 6 7 8 9 10 11

16 17 18 19 20 21 22 23 24 25 26

13

12

15

14

ABS(diag)-60

ABS (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

S: DTC C0109 POWER VOLTAGE MALFUNCTION

DTC DETECTING CONDITION:
Power voltage of the ABSCM&H/U is too low or too high.
TROUBLE SYMPTOM:
• ABS does not operate.
• EBD may not operate.

NOTE:
If EBD does not operate, brake warning light comes on as well as ABS warning light. Both warning lights go
off if voltage returns. 

Step

Check

Yes

No

1

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

Connector & terminal

(B301) No. 15 — Chassis ground:

Is the resistance less than 0.5 
Ω?

Go to step 2.

Repair the 
ABSCM&H/U 
ground harness.

2

CHECK POOR CONTACT IN CONNECTOR. Is there poor contact in con-

nectors between battery, igni-
tion switch and ABSCM&H/U?

Repair the con-
nector.

Go to step 3.

3

CHECK SOURCES OF SIGNAL NOISE.

Are the radio wave devices and 
electric components installed 
correctly?

Go to step 4.

Install the radio 
wave device and 
electric compo-
nents properly.

4

CHECK SOURCES OF SIGNAL NOISE.

Are noise sources (such as an 
antenna) installed near the 
sensor harness?

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

Go to step 5.

5

CHECK ABSCM&H/U.
1) Connect all the connectors.
2) Perform clear memory mode.
3) Perform the inspection mode.
4) Read the DTC.

Is the same DTC displayed?

Replace the 
ABSCM only. 
<Ref. to ABS-8, 
REPLACEMENT, 
ABS Control Mod-
ule and Hydraulic 
Control Unit 
(ABSCM&H/U).>

Go to step 6.

6

CHECK ANY OTHER DTC ON DISPLAY.

Is any other DTC displayed?

Inspect the DTC 
using “List of Diag-
nostic Trouble 
Code (DTC)”. 
<Ref. to 
ABS(diag)-38, List 
of Diagnostic Trou-
ble Code (DTC).>

Temporary poor 
contact occurs.