Subaru Legacy IV (2008 year). Manual - part 900

ABS-16

Front Magnetic Encoder

ABS

6. Front Magnetic Encoder

A: REMOVAL

Refer to “Front Hub Bearing” for removal, because
the front magnetic encoder is integrated with front
hub bearing.
<Ref. to DS-17, REMOVAL, Front Hub Unit Bear-
ing.>

B: INSTALLATION

Refer to “Front Hub Bearing” for installation, be-
cause the front magnetic encoder is integrated with
front hub bearing.
<Ref. to DS-18, INSTALLATION, Front Hub Unit
Bearing.>

C: INSPECTION

Visually check the magnetic encoder for any dam-
age. If necessary, replace with a new hub unit bear-
ing.

NOTE:
Because the magnetic encoder is integrated with
front hub unit bearing assembly, replace the hub
unit bearing with a new part if there is any defect
found on the magnetic encoder.

ABS-17

Rear Magnetic Encoder

ABS

7. Rear Magnetic Encoder

A: REMOVAL

Refer to “Rear Hub Unit Bearing” for removal, be-
cause the rear magnetic encoder is integrated with
rear hub unit bearing.
<Ref. to DS-19, REMOVAL, Rear Hub Unit Bear-
ing.>

B: INSTALLATION

Refer to “Rear Hub Unit Bearing” for installation,
because the rear magnetic encoder is integrated
with rear hub unit bearing.
<Ref. to DS-20, INSTALLATION, Rear Hub Unit
Bearing.>

C: INSPECTION

Visually check the magnetic encoder parts for any
damage. If necessary, replace with a new hub unit
bearing.

NOTE:
Because the magnetic encoder is integrated with
rear hub unit bearing assembly, replace the hub
unit bearing with a new part if there is any defect
found on the magnetic encoder.

ABS-18

G Sensor

ABS

8. G Sensor

A: REMOVAL

1) Disconnect the ground cable from battery.
2) Remove the console box.
<Ref. to EI-54, REMOVAL, Console Box.>
3) Disconnect the connector from G sensor.
4) Remove the G sensor from the body.

CAUTION:
• Do not drop or bump the G sensor.
• The G sensor integrated with the bracket. Do
not disassemble.

B: INSTALLATION

Install in the reverse order of removal.

CAUTION:
Do not drop or bump the G sensor.

Tightening torque:

7.5 N·m (0.76 kgf-m, 5.5 ft-lb)

C: INSPECTION

ABS00463

Step

Check

Yes

No

1

CHECK G SENSOR.
1) Turn the ignition switch to OFF.
2) Connect the Subaru Select Monitor to data 
link connector.
3) Set the Subaru Select Monitor to the {Brake 
Control System} mode.
4) Set the display in the {Current Data Display 
& Save} mode.
5) Read the G sensor output value.

Is the value –1.2 — 1.2 m/s

2

when the vehicle is in horizontal 
position?

Go to step 2.

Repair the harness 
connector between 
the G sensor and 
ABSCM&H/U. Or 
replace G sensor.

2

CHECK G SENSOR.
1) Remove the console box.
2) Remove the G sensor from vehicle. (Do not 
disconnect the connector.)
3) Read the Subaru Select Monitor display.

Is the value 8.1 — 11.2 m/s

2

when G sensor is inclined for-
ward to 90°?

Go to step 3.

Repair the harness 
connector between 
the G sensor and 
ABSCM&H/U. Or 
replace G sensor.

3

CHECK G SENSOR.
Read the Subaru Select Monitor display.

Is the value –8.1 — –11.2 m/s

2

when G sensor is inclined back-
ward 90°?

G sensor is nor-
mal.

Repair the harness 
connector between 
the G sensor and 
ABSCM&H/U. Or 
replace G sensor.

ABS(diag)-2

Basic Diagnostic Procedure

ABS (DIAGNOSTICS)

1. Basic Diagnostic Procedure

A: PROCEDURE

CAUTION:
Remove foreign matter (dust, water, oil etc.) from the ABSCM&H/U connector during removal and in-
stallation.

NOTE:
• To check harness for open or short circuits, shake the suspected trouble spot or connector.
• Refer to “Check List for Interview”. <Ref. to ABS(diag)-3, Check List for Interview.>

Step

Check

Yes

No

1

CHECK PRE-INSPECTION.
1) Ask the customer when and how the trouble 
occurred using the interview check list. <Ref. to 
ABS(diag)-3, Check List for Interview.>
2) Before performing diagnostics, check the 
components which might affect ABS problems. 
<Ref. to ABS(diag)-7, INSPECTION, General 
Description.>

Are components which might 
affect the ABS problem operat-
ing correctly?

Go to step 2.

Repair or replace 
each component.

2

CHECK INDICATION OF DTC ON SCREEN.
1) Turn the ignition switch to OFF.
2) Connect the Subaru Select Monitor to data 
link connector.
3) Turn the ignition switch to ON and run the 
Subaru Select Monitor.

NOTE:
If the communication function of the Subaru Se-
lect Monitor cannot be executed properly,
check the communication circuit. <Ref. to
ABS(diag)-15, COMMUNICATION FOR INI-
TIALIZING IMPOSSIBLE, INSPECTION, Sub-
aru Select Monitor.>
4) Read the DTC. <Ref. to ABS(diag)-18, 
OPERATION, Read Diagnostic Trouble Code 
(DTC).>
5) Record all DTCs and freeze frame data.

Is DTC displayed?

Go to step 4.

Go to step 3.

3

PERFORM GENERAL DIAGNOSIS.
1) Perform the inspection by referring to “Gen-
eral Diagnostic Table”. <Ref. to ABS(diag)-62, 
General Diagnostic Table.>
2) Perform the Clear Memory Mode. <Ref. to 
ABS(diag)-20, Clear Memory Mode.>
3) Perform the Inspection Mode. <Ref. to 
ABS(diag)-19, Inspection Mode.>
4) Read the DTC. <Ref. to ABS(diag)-18, 
Read Diagnostic Trouble Code (DTC).>
Check the DTC is not displayed.

Does the ABS warning light go 
off after turning the ignition 
switch to ON?

Finish the diagno-
sis.

Check the combi-
nation meter cir-
cuit. <Ref. to 
ABS(diag)-25,
ABS WARNING 
LIGHT DOES NOT 
GO OFF, ABS 
Warning Light / 
Brake Warning 
Light Illumination 
Pattern.>

4

PERFORM DIAGNOSIS.
1) Refer to “List of Diagnostic Trouble Code 
(DTC)”. <Ref. to ABS(diag)-29, LIST, List of 
Diagnostic Trouble Code (DTC).>
2) Correct the cause of trouble.
3) Perform the Clear Memory Mode. <Ref. to 
ABS(diag)-20, Clear Memory Mode.>
4) Perform the Inspection Mode. <Ref. to 
ABS(diag)-19, Inspection Mode.>
5) Read the DTC. <Ref. to ABS(diag)-18, 
Read Diagnostic Trouble Code (DTC).>

Is DTC displayed?

Repeat step 1 to 4 
until DTC does not 
appear.

Finish the diagno-
sis.