1997 SUBARU LEGACY battery

B4M0846A
10X2
CHECK GROUND SHORT OF HARNESS.
1) Turn ignition switch to OFF.
2) Disconnect two connectors from AT control module.
3) Disconnect connector from ABSCM.
4) Measure resistance between ABSCM connector and
chassis ground.
: Connector & terminal
(F49) No. 12—Chassis ground
Is resistance more than 1 MΩ?
: Go to step10X3.
: Repair harness between AT control module and
ABSCM.
B4M0848B
10X3
CHECK AT CONTROL MODULE.
1) Connect all connectors to AT control module.
2) Turn ignition switch to ON.
3) Measure voltage between AT control module connector
terminals.
: Connector & terminal
(B55) No. 1 (+)—(B56) No. 5 ()
Is voltage 10—13 V?
: Go to step10X4.
: Go to next step.
B4M0849B
4) Measure voltage between AT control module connector
and chassis ground.
: Connector & terminal
(B54) No. 6 (+)—Chassis ground ()
(B55) No. 1 (+)—Chassis ground ()
Is voltage 10—13 V?
: Replace AT control module.
: Repair harness connector between battery, igni-
tion switch and AT control module.
190
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

B4M0965
Y: 44 CCM OPEN
—A COMBINATION OF AT CONTROL
ABNORMALS—
DIAGNOSIS:

Combination of AT control faults
TROUBLE SYMPTOM:

ABS does not operate.
10Y1.Check battery short of harness.
10Y2.Check open circuit of harness.
10Y3.Check poor contact in connector between AT
control module and ABSCM.
10Y4.Check ABSCM.



192
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

B4M0847A
10Y1
CHECK BATTERY SHORT OF HARNESS.
1) Turn ignition switch to OFF.
2) Disconnect two connectors from AT control module.
3) Disconnect connector from ABSCM.
4) Turn ignition switch to ON.
5) Measure voltage between ABSCM connector and chas-
sis ground.
: Connector & terminal
(F49) No. 12 (+)—Chassis ground ()
Is voltage 0 V?
: Go to next step.
: Repair harness between AT control module and
ABSCM.
6) Turn ignition switch to OFF.
7) Measure voltage between ABSCM connector and chas-
sis ground.
: Connector & terminal
(F49) No. 12 (+)—Chassis ground ()
Is voltage 0 V?
: Go to step10Y2.
: Repair harness between AT control module and
ABSCM.
B4M0844A
10Y2
CHECK OPEN CIRCUIT OF HARNESS.
1) Connect all connectors to AT control module.
2) Turn ignition switch to ON.
3) Measure voltage between ABSCM connector and chas-
sis ground.
: Connector & terminal
(F49) No. 12 (+)—Chassis ground ()
(F49) No. 39 (+)—Chassis ground ()
Is voltage 10—13 V?
: Go to step10Y3.
: Repair harness connector between AT control
module and ABSCM.
194
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

B4M0966
Z: 46 GS POWER OVER
—G SENSOR LINE VOLTAGE TOO HIGH—
DIAGNOSIS:

Faulty G sensor power supply voltage
TROUBLE SYMPTOM:

ABS does not operate.
10Z1.Check battery short of harness.
WIRING DIAGRAM:
B4M1047
196
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

B4M0855A
10Z1
CHECK BATTERY SHORT OF HARNESS.
1) Turn ignition switch to OFF.
2) Remove console cover from console box.
3) Disconnect connector from G sensor.
4) Disconnect connector from ABSCM.
5) Turn ignition switch to ON.
6) Measure voltage between ABSCM connector and chas-
sis ground.
: Connector & terminal
(F49) No. 8 (+)—Chassis ground ()
(F49) No. 45 (+)—Chassis ground ()
Is voltage 0 V?
: Go to next step.
: Repair harness between ABSCM and G sensor.
7) Turn ignition switch to OFF.
8) Measure voltage between ABSCM and chassis ground.
: Connector & terminal
(F49) No. 8 (+)—Chassis ground ()
(F49) No. 45 (+)—Chassis ground ()
Is voltage 0 V?
: Replace ABSCM.
: Repair harness between ABSCM and chassis
ground.
197
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

B4M0968
AB: 51 V. RELAY
—ABNORMAL VALVE RELAY—
DIAGNOSIS:

Faulty valve relay
TROUBLE SYMPTOM:

ABS does not operate.
10AB1.Check freeze frame data.

10AB2.Check resistance of valve relay.
10AB3.Check contact point of valve relay.
10AB4.Check short of valve relay.
10AB5.Check power supply voltage at valve relay
contact point.
10AB6.Check broken wire and ground short in power
supply circuit of relay box.
10AB7.Check broken wire in contact point circuit of
relay box.
10AB8.Check ground short in contact point circuit of
relay box.
10AB9.Check diode of relay box.
10AB10.Check battery short in ground circuit of relay
box.
10AB11.Check broken wire in control circuit of relay
box.
10AB12.Check ground short in control circuit of relay
box.
10AB13.Check battery short in control circuit of relay
box.
Continues to next page.Continues to next page.













202
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

From the former page. From the former page.

10AB14.Check broken wire in control system harness
of valve relay.
10AB15.Check ground short in control system harness
of valve relay.
10AB16.Check battery short in control system harness
of valve relay.
10AB17.Check resistance of inlet solenoid valve.
10AB18.Check resistance of outlet solenoid valve.
10AB19.Check ground short of solenoid valve.
10AB20.Check ground short of harness.
10AB21.Check harness connector between ABSCM
and hydraulic unit.
10AB22.Check poor contact in connector between
ABSCM and hydraulic unit.
10AB23.Check ABSCM.
10AB24.Check battery short of solenoid valve.
10AB25.Check battery short of harness.
10AB26.Check ABSCM.












203
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

B4M0858A
10AB2
CHECK RESISTANCE OF VALVE RELAY.
1) Turn ignition switch to OFF.
2) Remove valve relay from relay box.
3) Measure resistance between valve relay terminals.
: Terminals
No. 85—No. 86
Is resistance 103±10Ω?
: Go to step10AB3.
: Replace valve relay.
B4M0811A
10AB3CHECK CONTACT POINT OF VALVE
RELAY.
1) Connect battery to valve relay terminals No. 85 and No.
86.
2) Measure resistance between valve relay terminals.
: Terminals
No. 30—No. 87
Is resistance less than 0.5Ω?
: Go to next.
: Replace valve relay.
: Terminals
No. 30—No. 87a
Is resistance more than 1 MΩ?
: Go to next step.
: Replace valve relay.
B4M0798A
3) Disconnect battery from valve relay terminals.
4) Measure resistance between valve relay terminals.
: Terminals
No. 30—No. 87
Is resistance more than 1 MΩ?
: Go to next.
: Replace valve relay.
: Terminals
No. 30—No. 87a
Is resistance less than 0.5Ω?
: Go to step10AB4.
: Replace valve relay.
205
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor