1997 SUBARU LEGACY battery

B4M0863B
10AC3CHECK GROUND CIRCUIT OF RELAY
BOX.
1) Disconnect connector (F50) from relay box.
2) Measure resistance between relay box connector and
chassis ground.
: Connector & terminal
(F50) No. 3—Chassis ground
Is resistance less than 0.5Ω?
: Go to step10AC4.
: Repair relay box ground harness.
B4M0867A
10AC4CHECK BATTERY SHORT IN CONTACT
POINT CIRCUIT OF RELAY BOX.
1) Disconnect connector from ABSCM.
2) Disconnect connector (ABS1) from hydraulic unit.
3) Turn ignition switch to ON.
4) Measure voltage between hydraulic unit connector and
chassis ground.
: Connector & terminal
(ABS1) No. 2 (+)—Chassis ground ()
Is voltage 0 V?
: Go to next step.
: Replace relay box. Check fuse No. 19 and SBF6.
5) Turn ignition switch to OFF.
6) Measure voltage between hydraulic unit connector and
chassis ground.
: Connector & terminal
(ABS1) No. 2 (+)—Chassis ground ()
Is voltage 0 V?
: Go to step10AC5.
: Replace relay box. Check fuse No. 9 and SBF6.
219
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

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.
221
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.














223
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.






224
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.
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.
226
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

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.
227
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

B4M0897
10AD11CHECK BATTERY SHORT IN CONTROL
CIRCUIT OF RELAY BOX.
1) Disconnect connector from ABSCM.
2) Turn ignition switch to ON.
3) Measure voltage between motor relay installing point
and chassis ground.
: Connector & terminal
Motor relay installing point No. 85 (+)—
Chassis ground ()
Motor relay installing point No. 86 (+)—
Chassis ground ().
Is voltage 0 V?
: Go to next step.
: Replace relay box and check all fuses.
4) Turn ignition switch to OFF.
5) Measure voltage between motor relay installing point
and chassis ground.
: Connector & terminal
Motor relay installing point No. 85 (+)—
Chassis ground
Motor relay installing point No. 86 (+)—
Chassis ground ()
Is voltage 0 V?
: Go to step10AD12.
: Replace relay box and check all fuses.
B4M0898B
10AD12CHECK BROKEN WIRE IN MONITOR
SYSTEM HARNESS.
1) Connect between terminals No. 10 and No. 1 of
ABSCM connector (F49) with a lead wire.
2) Measure resistance between relay box connector and
chassis ground.
: Connector & terminal
(F50) No. 6—Chassis ground
Is resistance less than 0.5Ω?
: Go to step10AD13.
: Repair harness connector between ABSCM and
relay box.
230
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

B4M0901A
10AD15CHECK BATTERY SHORT BETWEEN
RELAY BOX AND ABSCM.
1) Turn ignition switch to ON.
2) Measure voltage between ABSCM and chassis ground.
: Connector & terminal
(F49) No. 22 (+)—Chassis ground ()
(F49) No. 10 (+)—Chassis ground ()
Is voltage 0 V?
: Go to next step.
: Repair harness between relay box and ABSCM.
Check fuse SBF6.
3) Turn ignition switch to OFF.
4) Measure voltage between ABSCM and chassis ground.
: Connector & terminal
(F49) No. 22 (+)—Chassis ground ()
(F49) No. 10 (+)—Chassis ground ()
Is voltage 0 V?
: Go to step10AD16.
: Repair harness between relay box and ABSCM.
Check fuse SBF6.
B4M0902A
10AD16CHECK GROUND SHORT AT ABSCM
MONITOR TERMINAL.
Measure resistance between ABSCM terminals.
: Connector & terminal
To (F49) No. 10—No. 1
Is resistance more than 1 MΩ?
: Go to step10AD17.
: Replace ABSCM.
B4M0904A
10AD17CHECK ABSCM MOTOR DRIVE TERMI-
NAL.
1) Disconnect connector cover from ABSCM connector.

2) Connect all connectors.
3) Measure voltage between ABSCM connector terminals.
4) Operate the check sequence.
: Connector & terminals
(F49) No. 22 (+)—No.1()
Does the voltage drop from 10—13Vto
less than 1.5 V, and rise to 10—13 V again
when carrying out the check sequence?
: Go to step10AD18.
: Replace ABSCM.
232
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor