SUBARU LEGACY 1996 Service Repair Manual

WIRING DIAGRAM:
B4M1046
B4M0957A
10Q1
CHECK FREEZE FRAME DATA.
Press F,E,1and 5on the select monitor.
: Is the select monitor LED 5 off? Was the
ABS inactive when the problem occurred?
: Go to step10Q2.
: Go to step10Q11.
161
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

10Q2CHECK THE CONDITION WHEN THE
TROUBLE OCCURRED.
Ask the vehicle owner about driving conditions when the
trouble occurred. Attempt to duplicate the conditions.
: Is the trouble immediately apparent?
: Go to next.
: Go to step 11.
: Did the trouble occur immediately after
engine starting or during standing starts?
: Go to step10Q9.
: Go to step10Q3.
B4M0824B
10Q3CHECK RESISTANCE OF SOLENOID
VA LV E .
1) Turn ignition switch to OFF.
2) Disconnect two connectors (ABS1, F9) from hydraulic
unit.
3) Measure resistance between hydraulic unit connector
terminals.
: Trouble code/Connector & terminal
31/to (F9) No. 4—to (ABS1) No. 2
33/to (F9) No. 1—to (ABS1) No. 2
35/to (F9) No. 2—to (ABS1) No. 2
37/to (F9) No. 3—to (ABS1) No. 2
Is resistance 8.5±0.7Ω?
: Go to step10Q4.
: Replace hydraulic unit.
162
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

B4M0825B
10Q4CHECK GROUND SHORT OF SOLENOID
VA LV E .
Measure resistance between hydraulic unit connector and
chassis ground.
: Trouble code/Connector & terminal
31/to (F9) No. 4—Chassis ground
33/to (F9) No. 1—Chassis ground
35/to (F9) No. 2—Chassis ground
37/to (F9) No. 3—Chassis ground
Is resistance more than 1 MΩ?
: Go to step10Q5.
: Replace hydraulic unit.
B4M0828A
10Q5
CHECK GROUND SHORT OF HARNESS.
1) Disconnect connector from ABSCM.
2) Measure resistance between ABSCM connector and
chassis ground.
: Trouble code/Connector & terminal
31/(F49) No. 30—Chassis ground
33/(F49) No. 24—Chassis ground
35/(F49) No. 23—Chassis ground
37/(F49) No. 31—Chassis ground
Is resistance more than 1 MΩ?
: Go to step10Q6.
: Repair harness between ABSCM and hydraulic
unit.
163
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

B4M0829A
10Q6CHECK HARNESS CONNECTOR
BETWEEN ABSCM AND HYDRAULIC
UNIT.
1) Connect connector to hydraulic unit.
2) Measure resistance between ABSCM connector termi-
nals.
: Trouble code/Connector & terminal
31/(F49) No. 30—No. 1
33/(F49) No. 24—No. 1
35/(F49) No. 23—No. 1
37/(F49) No. 31—No. 1
Is resistance 9.0±0.7Ω?
: Go to step10Q7.
: Repair harness connector between ABSCM and
hydraulic unit.
10Q7CHECK POOR CONTACT IN CONNEC-
TOR BETWEEN ABSCM AND HYDRAU-
LIC UNIT.
: Is there poor contact in connectors between
ABSCM and hydraulic unit?
: Repair connector.
: Go to step10Q8.
10Q8
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.
164
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

B4M0826B
10Q9CHECK BATTERY SHORT OF SOLENOID
VA LV E .
1) Turn ignition switch to OFF.
2) Disconnect two connectors (ABS1, F9) from hydraulic
unit.
3) Disconnect connector from ABSCM.
4) Turn ignition switch to ON.
5) Measure voltage between hydraulic unit connector and
chassis ground.
: Trouble code/Connector & terminal
31/to (F9) No. 4 (+)—Chassis ground ()
33/to (F9) No. 1 (+)—Chassis ground ()
35/to (F9) No. 2 (+)—Chassis ground ()
37/to (F9) No. 3 (+)—Chassis ground ()
Is voltage 0 V?
: Go to next step.
: Replace hydraulic unit.
6) Turn ignition switch to OFF.
7) Measure voltage between hydraulic unit connector and
chassis ground.
: Trouble code/Connector & terminal
31/to (F9) No. 4 (+)—Chassis ground ()
33/to (F9) No. 1 (+)—Chassis ground ()
35/to (F9) No. 2 (+)—Chassis ground ()
37/to (F9) No. 3 (+)—Chassis ground ()
Is voltage 0 V?
: Go to step10Q10.
: Replace hydraulic unit.
B4M0827A
10Q10
CHECK BATTERY SHORT OF HARNESS.
1) Turn ignition switch to ON.
2) Measure voltage between ABSCM connector and chas-
sis ground.
: Trouble code/Connector & terminal
31/(F49) No. 30 (+)—Chassis ground ()
33/(F49) No. 24 (+)—Chassis ground ()
35/(F49) No. 23 (+)—Chassis ground ()
37/(F49) No. 31 (+)—Chassis ground ()
Is voltage 0 V?
: Go to next step.
: Repair harness between ABSCM and hydraulic
unit.
3) Turn ignition switch to OFF.
4) Measure voltage between ABSCM connector and chas-
sis ground.
165
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

: Trouble code/Connector & terminal
31/(F49) No. 30 (+)—Chassis ground ()
33/(F49) No. 24 (+)—Chassis ground ()
35/(F49) No. 23 (+)—Chassis ground ()
37/(F49) No. 31 (+)—Chassis ground ()
Is voltage 0 V?
: Replace ABSCM.
: Repair harness between ABSCM and hydraulic
unit.
B4M0824B
10Q11CHECK RESISTANCE OF SOLENOID
VA LV E .
1) Turn ignition switch to OFF.
2) Disconnect two connectors (ABS1, F9) from hydraulic
unit.
3) Measure resistance between hydraulic unit connector
terminals.
: Trouble code/Connector & terminal
31/to (F9) No. 4—to (ABS1) No. 2
33/to (F9) No. 1—to (ABS1) No. 2
35/to (F9) No. 2—to (ABS1) No. 2
37/to (F9) No. 3—to (ABS1) No. 2
Is resistance 8.5±0.7Ω?
: Go to step10Q12.
: Replace hydraulic unit.
B4M0825B
10Q12CHECK GROUND SHORT OF SOLENOID
VA LV E .
Measure resistance between hydraulic unit connector and
chassis ground.
: Trouble code/Connector & terminal
31/to (F9) No. 4—Chassis ground
33/to (F9) No. 1—Chassis ground
35/to (F9) No. 2—Chassis ground
37/to (F9) No. 3—Chassis ground
Is resistance more than 1 MΩ?
: Go to step10Q13.
: Replace hydraulic unit.
166
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

B4M0826B
10Q13CHECK BATTERY SHORT OF SOLENOID
VA LV E .
1) Disconnect connector from ABSCM.
2) Turn ignition switch to ON.
3) Measure voltage between hydraulic unit connector and
chassis ground.
: Trouble code/Connector & terminal
31/to (F9) No. 4 (+)—Chassis ground ()
33/to (F9) No. 1 (+)—Chassis ground ()
35/to (F9) No. 2 (+)—Chassis ground ()
37/to (F9) No. 3 (+)—Chassis ground ()
Is voltage 0 V?
: Go to next step.
: Replace hydraulic unit.
4) Turn ignition switch to OFF.
5) Measure voltage between hydraulic unit connector and
chassis ground.
: Trouble code/Connector & terminal
31/to (F9) No. 4 (+)—Chassis ground ()
33/to (F9) No. 1 (+)—Chassis ground ()
35/to (F9) No. 2 (+)—Chassis ground ()
37/to (F9) No. 3 (+)—Chassis ground ()
Is voltage 0 V?
: Go to step10Q14.
: Replace hydraulic unit.
B4M0827A
10Q14
CHECK BATTERY SHORT OF HARNESS.
1) Turn ignition switch to ON.
2) Measure voltage between ABSCM connector and chas-
sis ground.
: Trouble code/Connector & terminal
31/(F49) No. 30 (+)—Chassis ground ()
33/(F49) No. 24 (+)—Chassis ground ()
35/(F49) No. 23 (+)—Chassis ground ()
37/(F49) No. 31 (+)—Chassis ground ()
Is voltage 0 V?
: Go to next step.
: Repair harness between ABSCM and hydraulic
unit.
3) Turn ignition switch to OFF.
4) Measure voltage between ABSCM connector and chas-
sis ground.
167
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

: Trouble code/Connector & terminal
31/(F49) No. 30 (+)—Chassis ground ()
33/(F49) No. 24 (+)—Chassis ground ()
35/(F49) No. 23 (+)—Chassis ground ()
37/(F49) No. 31 (+)—Chassis ground ()
Is voltage 0 V?
: Go to step10Q15.
: Repair harness between ABSCM and hydraulic
unit.
B4M0828A
10Q15
CHECK GROUND SHORT OF HARNESS.
Measure resistance between ABSCM connector and chas-
sis ground.
: Trouble code/Connector & terminal
31/(F49) No. 30—Chassis ground
33/(F49) No. 24—Chassis ground
35/(F49) No. 23—Chassis ground
37/(F49) No. 31—Chassis ground
Is resistance more than 1 MΩ?
: Go to step10Q16.
: Repair harness between ABSCM and hydraulic
unit.
B4M0829A
10Q16CHECK HARNESS CONNECTOR
BETWEEN ABSCM AND HYDRAULIC
UNIT.
1) Connect connector to hydraulic unit.
2) Measure resistance between ABSCM connector termi-
nals.
: Trouble code/Connector & terminal
31/(F49) No. 30—No. 1
33/(F49) No. 24—No. 1
35/(F49) No. 23—No. 1
37/(F49) No. 31—No. 1
Is resistance 9.0±0.7Ω?
: Go to step10Q17.
: Repair harness connector between ABSCM and
hydraulic unit.
168
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

10Q17CHECK POOR CONTACT IN CONNEC-
TOR BETWEEN ABSCM AND HYDRAU-
LIC UNIT.
: Is there poor contact in connectors between
ABSCM and hydraulic unit?
: Repair connector.
: Go to step10Q18.
10Q18
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.
169
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

B4M0958
R: 32 FR. AV VALVE
—ABNORMAL FRONT RH OUTLET
SOLENOID VALVE—
B4M0959
S: 34 FL. AV VALVE
—ABNORMAL FRONT LH OUTLET
SOLENOID VALVE—
B4M0960
T: 3 6 R R . AV VA LV E
—ABNORMAL REAR RH OUTLET SOLENOID
VA LV E—
B4M0961
U: 38 RL. AV VALVE
—ABNORMAL REAR LH OUTLET SOLENOID
VA LV E—
170
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor