Subaru Legacy (2005 year). Service manual — part 774

ABS(diag)-61

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)-62

ABS (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

Step

Check

Yes

No

1

CHECK GENERATOR.
1) Start the engine.
2) Run the engine at idle after warming up.
3) Measure the voltage between generator B
terminal and chassis ground.

Terminals

Generator B terminal (+) — Chassis
ground (

−

):

Is the voltage 10 — 15 V?

Go to step 2.

Repair the genera-
tor.

2

CHECK BATTERY TERMINAL.
Turn the ignition switch to OFF.

Are the positive and negative
battery terminals clamped
tightly?

Go to step 3.

Tighten the termi-
nal.

3

CHECK INPUT VOLTAGE OF ABSCM&H/U.
1) Disconnect the connector from ABSCM&H/
U.
2) Run the engine at idle.
3) Operate the devices such as headlights, air
conditioner, defogger, etc. which produce
much electrical loading.
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 4.

Repair the
ABSCM&H/U
power circuit.

4

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 5.

Repair the
ABSCM&H/U
ground harness.

5

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 6.

6

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 7.

7

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)-63

ABS (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

T: DTC C0140 CAN COMMUNICATION MALFUNCTION

DTC DETECTING CONDITION:
Defective CAN communication
TROUBLE SYMPTOM:
Possibly the vehicle speed cannot output on CAN.

Step

Check

Yes

No

1

CHECK LAN SYSTEM.
Perform the diagnosis for LAN system. <Ref. to
LAN(diag)-24, OPERATION, Read Diagnostic
Trouble Code (DTC).>

Is there any fault in LAN sys-
tem?

Repair it according
to DTC of LAN
system.

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

ABS(diag)-64

ABS (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

U: DTC C0114 VALVE RELAY MALFUNCTION

DTC DETECTING CONDITION:
Defective valve relay
TROUBLE SYMPTOM:
• ABS does not operate.
• EBD does not operate depending on the trouble contents.

NOTE:
Brake warning light comes on as well as ABS warning light when EBD does not operate.
WIRING DIAGRAM:

B301

ABS00686

B301

E

14

15

ABSCM & H/U

18

M

MAIN SBF

SBF-6

No.1

No.33

E

7 8 9 10 11

6

5

4

1

15

14

13

12

2 3

22 23 24 25 26

21

20

19

16 17 18

BATTERY

IGNITION
SWITCH

MOTOR RELAY

VALVE
RELAY

SOLENOID

VALVE

PUMP MOTOR

FL INLET

RL INLET

FR INLET

RR INLET

FL OUTLET

RL OUTLET

FR OUTLET

RR OUTLET