SUBARU LEGACY 1996 Service Repair Manual

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.
191
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

B4M0844A
10X4
CHECK OPEN CIRCUIT OF HARNESS.
Measure voltage between ABSCM connector and chassis
ground.
: Connector & terminal
(F49) No. 12 (+)—Chassis ground ()
(F49) No. 39 (+)—Chassis ground ()
Is voltage 10—13 V?
: Go to step10X5.
: Repair harness connector between AT control
module and ABSCM.
10X5CHECK POOR CONTACT IN CONNEC-
TOR BETWEEN AT CONTROL MODULE
AND ABSCM.
: Is there poor contact in connectors between
AT control module and ABSCM?
: Repair connector.
: Go to step10X6.
10X6
CHECK ABSCM.
1) Connect all connectors.
2) Erase the memory.
3) Perform inspection mode.
4) Read out the trouble code.
: Is the same trouble code as in the current
diagnosis still being output?
: Replace ABSCM.
: Go to next.
: Are other trouble codes being output?
: Proceed with the diagnosis corresponding to the
trouble code.
: A temporary poor contact.
192
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.



193
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

WIRING DIAGRAM:
B4M1040
194
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.
195
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

10Y3CHECK POOR CONTACT IN CONNEC-
TOR BETWEEN AT CONTROL MODULE
AND ABSCM.
: Is there poor contact in connectors between
AT control module and ABSCM?
: Repair connector.
: Go to step10Y4.
10Y4
CHECK ABSCM.
1) Connect all connectors.
2) Erase the memory.
3) Perform inspection mode.
4) Read out the trouble code.
: Is the same trouble code as in the current
diagnosis still being output?
: Replace ABSCM.
: Go to next.
: Are other trouble codes being output?
: Proceed with the diagnosis corresponding to the
trouble code.
: A temporary poor contact.
196
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
197
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.
198
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

B4M0967
AA: 46 GS POWER LOW
—G SENSOR LINE VOLTAGE TOO LOW—
DIAGNOSIS:

Faulty G sensor power supply voltage
TROUBLE SYMPTOM:

ABS does not operate.
10AA1.Check G sensor.
10AA2.Check ground short of G sensor.
10AA3.Check short of harness between ABSCM and
G sensor.
10AA4.Check ground short of harness.
10AA5.Check poor contact in connector between
ABSCM and G sensor.
10AA6.Check ABSCM.





199
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

WIRING DIAGRAM:
B4M1047
B4M0851B
10AA1
CHECK G SENSOR.
1) Turn ignition switch to OFF.
2) Remove console cover from console box.
3) Disconnect connector from G sensor.
4) Measure resistance of G sensor.
: Connector & terminal
To (P11) No. 1—No. 3
Is resistance 50±8 kΩ?
: Go to step10AA2.
: Replace G sensor.
200
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor