1996 SUBARU LEGACY brake

B4M0880B
10AC8CHECK BATTERY SHORT OF SOLENOID
VA LV E .
1) Disconnect connector (ABS1, F9) from hydraulic unit.
2) Turn ignition switch to ON.
3) Measure voltage between hydraulic unit connector and
chassis ground.
: Connector & terminal
To (F63) No. 4 (+)—Chassis ground ()
Is voltage 0 V?
: Go to next step.
: Replace hydraulic unit and check all fuses.
4) Turn ignition switch to OFF.
5) Measure voltage between hydraulic unit connector and
chassis ground.
: Connector & terminal
To (F63) No. 4 (+)—Chassis ground ()
Is voltage 0 V?
: Go to step10AC9.
: Replace hydraulic unit and check all fuses.
B4M0881A
10AC9
CHECK BATTERY SHORT OF HARNESS.
1) Disconnect connector from hydraulic unit.
2) Turn ignition switch to ON.
3) Measure voltage between ABSCM connector and chas-
sis ground.
: Connector & terminal
(F49) No. 30 (+)—Chassis ground ()
(F49) No. 24 (+)—Chassis ground ()
(F49) No. 23 (+)—Chassis ground ()
(F49) No. 31 (+)—Chassis ground ()
(F49) No. 3 (+)—Chassis ground ()
(F49) No. 51 (+)—Chassis ground ()
(F49) No. 50 (+)—Chassis ground ()
(F49) No. 4 (+)—Chassis ground ()
Is voltage 0 V?
: Go to next step.
: Repair harness between hydraulic unit and
ABSCM and check all fuses.
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4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

4) Turn ignition switch to OFF.
5) Measure voltage between ABSCM connector and chas-
sis ground.
: Connector & terminal
(F49) No. 30 (+)—Chassis ground ()
(F49) No. 24 (+)—Chassis ground ()
(F49) No. 23 (+)—Chassis ground ()
(F49) No. 31 (+)—Chassis ground ()
(F49) No. 3 (+)—Chassis ground ()
(F49) No. 51 (+)—Chassis ground ()
(F49) No. 50 (+)—Chassis ground ()
(F49) No. 4 (+)—Chassis ground ()
Is voltage 0 V?
: Go to step10AC10.
: Repair harness between hydraulic unit and
ABSCM and check all fuses.
10AC10CHECK POOR CONTACT IN CONNEC-
TOR BETWEEN ABSCM AND HYDRAU-
LIC UNIT.
: Is there poor contact in connector between
ABSCM and hydraulic unit?
: Repair connector.
: Go to step10AC11.
10AC11
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.
223
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

B4M0969
AD: 52 M. RELAY OPEN
—OPEN CIRCUIT OF MOTOR RELAY—
DIAGNOSIS:

Faulty motor

Faulty motor relay

Faulty harness connector
TROUBLE SYMPTOM:

ABS does not operate.
10AD1.Check resistance of motor relay.
10AD2.Check contact point of motor relay.
10AD3.Check short of motor relay.
10AD4.Check input voltage of relay box.
10AD5.Check input voltage of motor relay.
10AD6.Check broken wire in contact point circuit of
relay box.
10AD7.Check ground short in contact point circuit of
relay box.
10AD8.Check broken wire in monitor system circuit of
relay box.
10AD9.Check broken wire in control circuit of relay
box.
10AD10.Check ground short in control circuit of relay
box.
10AD11.Check battery short in control circuit of relay
box.
10AD12.Check broken wire in monitor system harness.
10AD13.Check broken wire in relay control system
harness.
10AD14.Check ground short between relay box and
ABSCM.
Continues to next page.














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

From the former page.
10AD15.
Check battery short between relay box and
ABSCM.
10AD16.Check ground short at ABSCM monitor
terminal.
10AD17.Check ABSCM motor drive terminal.
10AD18.Check motor operation.
10AD19.Check poor contact in connector between
hydraulic unit, relay box and ABSCM.
10AD20.Check ABSCM.






225
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

WIRING DIAGRAM:
B4M1049
226
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

B4M0886A
10AD1
CHECK RESISTANCE OF MOTOR RELAY.
1) Turn ignition switch to OFF.
2) Remove motor relay from relay box.
3) Measure resistance between motor relay terminals.
: Terminals
No. 85—No. 86
Is resistance 80±10Ω?
: Go to step10AD2.
: Replace motor relay.
B4M0887A
10AD2CHECK CONTACT POINT OF MOTOR
RELAY.
1) Connect battery to motor relay terminals No. 85 and No.
86.
2) Measure resistance between motor relay terminals.
: Terminals
No. 30—No. 87
Is resistance less than 0.5Ω?
: Go to next step.
: Replace motor relay.
B4M0888A
3) Disconnect battery from motor relay terminals.
4) Measure resistance between motor relay terminals.
: Terminals
No. 30—No. 87
Is resistance more than 1 MΩ?
: Go to step10AD3.
: Replace motor relay.
227
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

B4M0889A
10AD3
CHECK SHORT OF MOTOR RELAY.
Measure resistance between motor relay terminals.
: Terminals
No. 85—No. 30
No. 85—No. 87
Is resistance more than 1 MΩ?
: Go to step10AD4.
: Replace motor relay.
B4M0890B
10AD4CHECK INPUT VOLTAGE OF RELAY
BOX.
1) Disconnect connector (F8) from relay box.
2) Measure voltage between relay box connector and
chassis ground.
: Connector & terminal
(F8) No. 2 (+)—Chassis ground ()
Is voltage 10—13 V?
: Go to step10AD5.
: Repair harness connector between battery and
relay box. Check fuse SBF6.
B4M0891
10AD5CHECK INPUT VOLTAGE OF MOTOR
RELAY.
1) Connect connector (F8) to relay box.
2) Measure voltage between relay box and chassis
ground.
: Connector & terminal
Relay installing point No. 87 (+)—Chassis
ground ()
Is voltage 10—13 V?
: Go to step10AD6.
: Replace relay box and fuse SBF6.
228
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

B4M0892A
10AD6CHECK BROKEN WIRE IN CONTACT
POINT CIRCUIT OF RELAY BOX.
1) Disconnect connector (ABS1) from hydraulic unit.
2) Measure resistance between hydraulic unit and motor
relay installing portion.
: Connector & terminal
(ABS1) No. 1—Motor relay installing por-
tion No. 30
Is resistance less than 0.5Ω?
: Go to step10AD7.
: Replace relay box.
B4M0893A
10AD7CHECK GROUND SHORT IN CONTACT
POINT CIRCUIT OF RELAY BOX.
Measure resistance between hydraulic unit and chassis
ground.
: Connector & terminal
(ABS1) No. 1—Chassis ground
Is resistance more than 1 MΩ?
: Go to step10AD8.
: Replace relay box. Check fuse No. 19.
B4M0795B
10AD8CHECK BROKEN WIRE IN MONITOR
SYSTEM CIRCUIT OF RELAY BOX.
1) Disconnect connector (F50) from relay box.
2) Measure resistance between relay box connector and
motor relay installing point.
: Connector & terminal
To (F50) No. 6—Motor relay installing point
No. 30
Is resistance less than 0.5Ω?
: Go to step10AD9.
: Replace relay box.
229
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor