Subaru Legacy IV (2008 year). Service manual — part 911

ABS(diag)-43

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ABS (DIAGNOSTICS)

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 illuminates as well as the ABS warning light.
WIRING DIAGRAM:

ABS00805

MAIN SBF

SBF-6

No.33

B301

E

E

15

18

ABSCM & H/U

BATTERY

GENERATOR

IGNITION
SWITCH

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)-44

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ABS (DIAGNOSTICS)

Step

Check

Yes

No

1

CHECK INPUT VOLTAGE OF ABSCM&H/U.
1) Turn the ignition switch to OFF.
2) Disconnect the ABSCM&H/U connectors.
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 THE ABSCM&H/U GROUND CIR-
CUIT.
1) Turn the ignition switch to OFF.
2) Measure the resistance between the
ABSCM&H/U connector and chassis ground.

Connector & terminal

(B301) No. 15 — Chassis ground:

Is the resistance less than 0.5

:? Go to step 3.

Repair the
ABSCM&H/U
ground harness.

3

CHECK POOR CONTACT IN CONNECTOR.

Is there poor contact in connec-
tor between generator, battery
and ABSCM&H/U?

Repair the connec-
tor.

Go to step 4.

4

CHECK ABSCM&H/U.
1) Connect all connectors.
2) Clear the memory. <Ref. to ABS(diag)-20,
Clear Memory Mode.>
3) Perform the Inspection Mode. <Ref. to
ABS(diag)-19, Inspection Mode.>
4) Read the DTC.

Is the same DTC displayed?

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

Go to step 5.

5

CHECK FOR ANY OTHER DTC ON DISPLAY. Is any other DTC displayed?

Check DTC using
“List of Diagnostic
Trouble Code
(DTC)”. <Ref. to
ABS(diag)-29, List
of Diagnostic Trou-
ble Code (DTC).>

Temporary poor
contact occurs.

ABS(diag)-45

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ABS (DIAGNOSTICS)

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 illuminates as well as the 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)-46

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ABS (DIAGNOSTICS)

Step

Check

Yes

No

1

CHECK THE ABSCM&H/U GROUND CIR-
CUIT.
1) Turn the ignition switch to OFF.
2) Disconnect the ABSCM&H/U connectors.
3) Measure the resistance between the
ABSCM&H/U and chassis ground.

Connector & terminal

(B301) No. 15 — Chassis ground:

Is the resistance less than 0.5

:? Go to step 2.

Repair the
ABSCM&H/U
ground harness.

2

CHECK POOR CONTACT IN CONNECTOR.

Is there poor contact of the con-
nector between the battery,
ignition switch and ABSCM&H/
U?

Repair the connec-
tor.

Go to step 3.

3

CHECK CAUSE OF SIGNAL NOISE.

Is the car telephone or the radio
properly installed?

Go to step 4.

Properly install the
car telephone or
the radio.

4

CHECK CAUSE OF SIGNAL NOISE.

Is there a noise source (such as
an antenna) installed near the
sensor harness?

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

Go to step 5.

5

CHECK ABSCM&H/U.
1) Connect all connectors.
2) Clear the memory. <Ref. to ABS(diag)-20,
Clear Memory Mode.>
3) Perform the Inspection Mode. <Ref. to
ABS(diag)-19, 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 FOR ANY OTHER DTC ON DISPLAY. Is any other DTC displayed?

Check DTC using
“List of Diagnostic
Trouble Code
(DTC)”. <Ref. to
ABS(diag)-29, List
of Diagnostic Trou-
ble Code (DTC).>

Temporary poor
contact occurs.