Subaru Legacy (2005 year). Service manual — part 772

ABS(diag)-53

ABS (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

J: DTC C0120 FRONT INLET SOLENOID VALVE LH MALFUNCTION IN ABS

CONTROL MODULE AND HYDRAULIC CONTROL UNIT (ABSCM&H/U)

NOTE:
For the diagnostic procedure, refer to DTC C0126. <Ref. to ABS(diag)-53, DTC C0126 REAR INLET SOLE-
NOID VALVE RH MALFUNCTION IN ABS CONTROL MODULE AND HYDRAULIC CONTROL UNIT (AB-
SCM&H/U), Diagnostic Procedure with Diagnostic Trouble Code (DTC).>

K: DTC C0122 FRONT INLET SOLENOID VALVE RH MALFUNCTION IN ABS

CONTROL MODULE AND HYDRAULIC CONTROL UNIT (ABSCM&H/U)

NOTE:
For the diagnostic procedure, refer to DTC C0126. <Ref. to ABS(diag)-53, DTC C0126 REAR INLET SOLE-
NOID VALVE RH MALFUNCTION IN ABS CONTROL MODULE AND HYDRAULIC CONTROL UNIT (AB-
SCM&H/U), Diagnostic Procedure with Diagnostic Trouble Code (DTC).>

L: DTC C0124 REAR INLET SOLENOID VALVE LH MALFUNCTION IN ABS

CONTROL MODULE AND HYDRAULIC CONTROL UNIT (ABSCM&H/U)

NOTE:
For the diagnostic procedure, refer to DTC C0126. <Ref. to ABS(diag)-53, DTC C0126 REAR INLET SOLE-
NOID VALVE RH MALFUNCTION IN ABS CONTROL MODULE AND HYDRAULIC CONTROL UNIT (AB-
SCM&H/U), Diagnostic Procedure with Diagnostic Trouble Code (DTC).>

M: DTC C0126 REAR INLET SOLENOID VALVE RH MALFUNCTION IN ABS

CONTROL MODULE AND HYDRAULIC CONTROL UNIT (ABSCM&H/U)

DTC DETECTING CONDITION:
• Defective harness connector
• Defective inlet solenoid valve in 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.

9

CHECK ANY OTHER DTC ON DISPLAY.

Is any other DTC displayed?

Perform the diag-
nosis according to
DTC.

It results from a
temporary noise
interference.

NOTE:
Though ABS warn-
ing light remains to
illuminate at this
time, it is normal.
Drive the vehicle at
more than 12 km/h
(7 MPH) in order to
make ABS warning
light go off. Be sure
to drive the vehicle
and check the
warning light goes
off.

Step

Check

Yes

No

ABS(diag)-54

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)-55

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)-56

ABS (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

N: DTC C0121 FRONT OUTLET SOLENOID VALVE LH MALFUNCTION IN ABS

CONTROL MODULE AND HYDRAULIC CONTROL UNIT (ABSCM&H/U)

NOTE:
For the diagnostic procedure, refer to DTC C0127. <Ref. to ABS(diag)-56, DTC C0127 REAR OUTLET SO-
LENOID VALVE RH MALFUNCTION IN ABS CONTROL MODULE AND HYDRAULIC CONTROL UNIT
(ABSCM&H/U), Diagnostic Procedure with Diagnostic Trouble Code (DTC).>

O: DTC C0123 FRONT OUTLET SOLENOID VALVE RH MALFUNCTION IN ABS

CONTROL MODULE AND HYDRAULIC CONTROL UNIT (ABSCM&H/U)

NOTE:
For the diagnostic procedure, refer to DTC C0127. <Ref. to ABS(diag)-56, DTC C0127 REAR OUTLET SO-
LENOID VALVE RH MALFUNCTION IN ABS CONTROL MODULE AND HYDRAULIC CONTROL UNIT
(ABSCM&H/U), Diagnostic Procedure with Diagnostic Trouble Code (DTC).>

P: DTC C0125 REAR OUTLET SOLENOID VALVE LH MALFUNCTION IN ABS

CONTROL MODULE AND HYDRAULIC CONTROL UNIT (ABSCM&H/U)

NOTE:
For the diagnostic procedure, refer to DTC C0127. <Ref. to ABS(diag)-56, DTC C0127 REAR OUTLET SO-
LENOID VALVE RH MALFUNCTION IN ABS CONTROL MODULE AND HYDRAULIC CONTROL UNIT
(ABSCM&H/U), Diagnostic Procedure with Diagnostic Trouble Code (DTC).>

Q: DTC C0127 REAR OUTLET SOLENOID VALVE RH MALFUNCTION IN ABS

CONTROL MODULE AND HYDRAULIC CONTROL UNIT (ABSCM&H/U)

DTC DETECTING CONDITION:
• Defective harness connector
• Defective outlet solenoid valve in 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.