SUBARU LEGACY 1997 Service Repair Manual

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.
166
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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.
167
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.
168
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—
169
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

DIAGNOSIS:

Faulty harness/connector

Faulty outlet solenoid valve in hydraulic unit
TROUBLE SYMPTOM:

ABS does not operate.
10U1.Check freeze frame data.



10U2.Check the condition when the trouble
occurred.
10U3.Check resistance of solenoid valve.
10U4.Check ground short of solenoid valve.
10U5.Check ground short of harness.
10U6.Check harness connector between ABSCM
and hydraulic unit.
10U7.Check poor contact in connector between
ABSCM and hydraulic unit.
10U8.Check ABSCM.
10U9.Check battery short of solenoid valve.
10U10.Check battery short of harness.
10U11.Check resistance of solenoid valve.
10U12.Check ground short of solenoid valve.
Continues to next page.










170
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10. Diagnostics Chart with Select Monitor

From the former page.
10U13.
Check battery short of solenoid valve.
10U14.Check battery short of harness.
10U15.Check ground short of harness.
10U16.Check harness connector between ABSCM
and hydraulic unit.
10U17.Check poor contact in connector between
ABSCM and hydraulic unit.
10U18.Check ABSCM.






171
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10. Diagnostics Chart with Select Monitor

WIRING DIAGRAM:
B4M1046
B4M0957A
10U1
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 step10U2.
: Go to step10U11.
172
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10. Diagnostics Chart with Select Monitor

10U2CHECK 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 step10U11.
: Did the trouble occur immediately after
engine starting or during standing starts?
: Go to step10U9.
: Go to step10U3.
B4M0831B
10U3CHECK 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
32/to (F9) No. 8—to (ABS1) No. 2
34/to (F9) No. 5—to (ABS1) No. 2
36/to (F9) No. 6—to (ABS1) No. 2
38/to (F9) No. 7—to (ABS1) No. 2
Is resistance 4.3±0.5Ω?
: Go to step10U4.
: Replace hydraulic unit.
173
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

B4M0832B
10U4CHECK GROUND SHORT OF SOLENOID
VA LV E .
Measure resistance between hydraulic unit connector and
chassis ground.
: Trouble code/Connector & terminal
32/to (F9) No. 8—Chassis ground
34/to (F9) No. 5—Chassis ground
36/to (F9) No. 6—Chassis ground
38/to (F9) No. 7—Chassis ground
Is resistance more than 1 MΩ?
: Go to step10U5.
: Replace hydraulic unit.
B4M0835A
10U5
CHECK GROUND SHORT OF HARNESS.
1) Disconnect connector from ABSCM.
2) Measure resistance between ABSCM connector and
chassis ground.
: Trouble code/Connector & terminal
32/(F49) No. 3—Chassis ground
34/(F49) No. 51—Chassis ground
36/(F49) No. 50—Chassis ground
38/(F49) No. 4—Chassis ground
Is resistance more than 1 MΩ?
: Go to step10U6.
: Repair harness between ABSCM and hydraulic
unit.
174
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

B4M0836A
10U6CHECK 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
32/(F49) No. 3—No. 1
34/(F49) No. 51—No. 1
36/(F49) No. 50—No. 1
38/(F49) No. 4—No. 1
Is resistance 4.8±0.5Ω?
: Go to step10U7.
: Repair harness connector between ABSCM and
hydraulic unit.
10U7CHECK 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 step10U8.
10U8
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.
175
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor