Subaru Legacy (2005 year). Service manual - part 776

ABS(diag)-69

ABS (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

Step

Check

Yes

CHECK OUTPUT OF STOP LIGHT SWITCH
USING SUBARU SELECT MONITOR.
1) Select {Current Data Display & Save} in
Subaru Select Monitor.
2) Release the brake pedal.
3) Read the stop light switch signal in Subaru
Select Monitor.

Is “OFF” displayed on the dis-
play?

Go to step 2.

Go to step 3.

CHECK OUTPUT OF STOP LIGHT SWITCH
USING SUBARU SELECT MONITOR.
1) Depress the brake pedal.
2) Read the stop light switch output in Subaru
Select Monitor.

Is “ON” displayed on the dis-
play?

Go to step 5.

Go to step 3.

CHECK IF STOP LIGHTS COME ON.
Depress the brake pedal.

Does the stop light illuminate? Go to step 4.

Repair the stop
lights circuit.

CHECK OPEN CIRCUIT IN HARNESS.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ABSCM&H/
U.
3) Depress the brake pedal.
4) Measure the voltage between ABSCM&H/
U connector and chassis ground.

Connector & terminal

(B301) No. 20 (+) — Chassis ground (

−

Is the voltage 10 — 15 V?

Go to step 5.

Repair harness
between stop light
switch and
ABSCM&H/U con-
nector.

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

nector between stop light
switch and ABSCM&H/U?

Go to step 6.

Repair the con-
nector.

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.

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)-70

ABS (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

X: DTC C0118 G SENSOR OUTPUT VOLTAGE MALFUNCTION

DTC DETECTING CONDITION:
Defective G sensor
TROUBLE SYMPTOM:
ABS does not operate.
WIRING DIAGRAM:

ABS00419

ABSCM & H/U

B301

B292

ABS G SENSOR

B292

1 2 3

1 2 3 4 5 6 7 8 9 10 11

16 17 18 19 20 21 22 23 24 25 26

ABS(diag)-71

ABS (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

Step

Check

Yes

CHECK OUTPUT OF G SENSOR USING
SUBARU SELECT MONITOR.
1) Select {Current Data Display & Save} in
Subaru Select Monitor.
2) Read the G sensor output on Subaru
Select Monitor.

Is the reading indicated on dis-
play

−1.2 — 1.2 m/s when G

sensor is horizontal?

Go to step 2.

Go to step 5.

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

nector between ABSCM&H/U
and G sensor?

Repair the con-
nector.

Go to step 3.

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 4.

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.

CHECK INPUT VOLTAGE OF G SENSOR.
1) Turn the ignition switch to OFF.
2) Remove the console box.
3) Remove the G sensor from vehicle. (Do not
disconnect connector.)
4) Turn the ignition switch to ON.
5) Measure the voltage between G sensor
connector terminals.

Connector & terminal

(B292) No. 1 (+) — No. 3 (

−

Is the voltage 4.75 — 5.25 V?

Go to step 6.

Repair the har-
ness connector
between G sensor
and ABSCM&H/U.

CHECK OPEN CIRCUIT IN G SENSOR OUT-
PUT HARNESS AND GROUND HARNESS.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ABSCM&H/
U.
3) Measure the resistance between
ABSCM&H/U connector terminals.

Connector & terminal

(B301) No. 21 — No. 10:

Is the resistance 1.8 — 2.4
k

Ω?

Go to step 7.

Repair the har-
ness connector
between G sensor
and ABSCM&H/U.

CHECK GROUND SHORT IN G SENSOR
OUTPUT HARNESS.
1) Disconnect the connector from G sensor.
2) Measure the resistance between
ABSCM&H/U connector and chassis ground.

Connector & terminal

(B301) No. 21 — Chassis ground:

Is the resistance more than 1
M

Ω?

Go to step 8.

Repair the har-
ness between G
sensor and
ABSCM&H/U.

CHECK G SENSOR.
1) Connect the connector to G sensor.
2) Connect the connector to ABSCM&H/U.
3) Turn the ignition switch to ON.
4) Measure the voltage between G sensor
connector terminals.

Connector & terminal

(B292) No. 2 (+) — No. 3 (

−

Is the voltage 2.1 — 2.5 V
when G sensor is on a level?

Go to step 9.

Replace G sen-
sor. <Ref. to ABS-
18, G Sensor.>