1997 SUBARU LEGACY ignition

B4M0892A
8L6CHECK 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 step8L7.
: Replace relay box.
B4M0893A
8L7CHECK 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 step8L8.
: Replace relay box. Check fuse No. 19.
B4M0793A
8L8CHECK BATTERY SHORT IN CONTACT
POINT CIRCUIT OF RELAY BOX.
1) Disconnect connector from ABSCM.
2) Turn ignition switch to ON.
3) Measure voltage between ABSCM connector and chas-
sis ground.
: Connector & terminal
(ABS1) No. 1 (+)—Chassis ground ()
Is voltage 0 V?
: Go to next step.
: Replace relay box.
4) Turn ignition switch to OFF.
5) Measure voltage between ABSCM connector and chas-
sis ground.
: Connector & terminal
(ABS1) No. 1 (+)—Chassis ground ()
Is voltage 0 V?
: Go to step8L9.
: Replace relay box.
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4-4cBRAKES [ABS 5.3 TYPE]
8. Diagnostics Chart with Trouble Code

B4M0895B
3) Measure resistance between motor relay installing point
and relay box connector.
: Connector & terminal
Motor relay installing point No. 86—To
(F50) No. 4
Is resistance less than 0.5Ω?
: Go to step8L11.
: Replace relay box.
B4M0896
8L11CHECK GROUND SHORT IN CONTROL
CIRCUIT OF RELAY BOX.
Measure resistance between relay box and chassis
ground.
: Connector & terminal
Motor relay installing point No. 86—Chas-
sis ground
Motor relay installing point No. 85—Chas-
sis ground
Is resistance more than 1 MΩ?
: Go to step8L12.
: Replace relay box. Check fuse No. 19.
B4M0897
8L12CHECK BATTERY SHORT IN CONTROL
CIRCUIT OF RELAY BOX.
1) Turn ignition switch to ON.
2) Measure voltage between motor relay installing point
and chassis ground.
: Connector & terminal
Motor relay installing point (+) No. 86—
Chassis ground ()
Motor relay installing point (+) No. 85—
Chassis ground ()
Is voltage 0 V?
: Go to next step.
: Replace relay box and check all fuses.
96
4-4cBRAKES [ABS 5.3 TYPE]
8. Diagnostics Chart with Trouble Code

3) Turn ignition switch to OFF.
4) Measure voltage between motor relay installing point
and chassis ground.
: Connector & terminal
Motor relay installing point (+) No. 86—
Chassis ground
Motor relay installing point (+) No. 85—
Chassis ground
Is voltage 0 V?
: Go to step8L13.
: Replace relay box and check all fuses.
B4M0898B
8L13CHECK 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 step8L14.
: Repair harness connector between ABSCM and
relay box.
97
4-4cBRAKES [ABS 5.3 TYPE]
8. Diagnostics Chart with Trouble Code

B4M0901A
8L16CHECK 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 step8L17.
: Repair harness between relay box and ABSCM.
Check fuse SBF6.
B4M0902A
8L17CHECK GROUND SHORT AT ABSCM
MONITOR TERMINAL.
Measure resistance between ABSCM terminals.
: Connector & terminal
To (F49) No. 10—No. 1
Is resistance less than 0.5Ω?
: Go to step8L18.
: Replace ABSCM.
B4M0903A
8L18CHECK BATTERY SHORT AT ABSCM
MONITOR TERMINAL.
1) Disconnect connector cover from ABSCM connector.

2) Connect all connectors.
3) Turn ignition switch to ON.
4) Measure voltage between ABSCM connector terminals.
: Connector & terminal
(F49) No. 10 (+)—No.1()
Is voltage less than 2 V?
: Go to next step.
: Replace ABSCM.
5) Turn ignition switch to OFF.
6) Measure voltage between ABSCM connector terminals.
: Connector & terminal
(F49) No. 10 (+)—No.1()
Is voltage less than 2 V?
: Go to step8L19.
: Replace ABSCM.
99
4-4cBRAKES [ABS 5.3 TYPE]
8. Diagnostics Chart with Trouble Code

B4M0908A
8M2
CHECK OPEN CIRCUIT OF HARNESS.
1) Turn ignition switch to OFF.
2) Disconnect connector from ABSCM.
3) Depress brake pedal.
4) Measure voltage between ABSCM connector and chas-
sis ground.
: Connector & terminal
(F49) No. 36—Chassis ground
Is voltage 10—13 V?
: Go to step8M3.
: Repair harness between stop light switch and
ABSCM.
8M3CHECK POOR CONTACT IN CONNEC-
TOR BETWEEN STOP LIGHT SWITCH
AND ABSCM.
: Is there poor contact in connector between
stop light switch and ABSCM?
: Repair connector.
: Go to step8M4.
8M4
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.
104
4-4cBRAKES [ABS 5.3 TYPE]
8. Diagnostics Chart with Trouble Code

WIRING DIAGRAM:
B4M1050
8N1CHECK ALL FOUR WHEELS FOR FREE
TURNING.
: Have the wheels been turned freely such as
when the vehicle is lifted up, or operated on
a rolling road?
: The ABS is normal. Erase the trouble code.
: Go to step8N2.
B4M0910A
8N2
CHECK SPECIFICATIONS OF ABSCM.
Check specifications of the plate attached to the ABSCM.
: Is an ABSCM for 4WD model installed on a
FWD model?
CAUTION:
Be sure to turn ignition switch to OFF when removing
ABSCM.
: Replace ABSCM.
: Go to step8N3.
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4-4cBRAKES [ABS 5.3 TYPE]
8. Diagnostics Chart with Trouble Code

B4M0911B
8N3
CHECK INPUT VOLTAGE OF G SENSOR.
1) Turn ignition switch to OFF.
2) Remove console box.
3) Disconnect G sensor from body. (Do not disconnect
connector.)
4) Turn ignition switch to ON.
5) Measure voltage between G sensor connector termi-
nals.
: Connector & terminal
(P11) No. 1 (+)—No.3()
Is voltage 5±0.25 V?
: Go to step8N4.
: Repair harness connector between G sensor and
ABSCM.
B4M0912A
8N4CHECK BROKEN WIRE IN G SENSOR
OUTPUT HARNESS AND GROUND HAR-
NESS.
1) Turn ignition switch to OFF.
2) Disconnect connector from ABSCM.
3) Measure resistance between ABSCM connector termi-
nals.
: Connector & terminal
(F49) No. 7—No. 45
Is resistance 4.6±0.3 kΩ?
: Go to step8N5.
: Repair harness between G sensor and ABSCM.
107
4-4cBRAKES [ABS 5.3 TYPE]
8. Diagnostics Chart with Trouble Code

B4M0913A
8N5CHECK GROUND SHORT IN G SENSOR
OUTPUT HARNESS.
1) Disconnect connector from G sensor.
2) Measure resistance between ABSCM connector and
chassis ground.
: Connector & terminal
(F49) No. 7—Chassis ground
Is resistance more than 1 MΩ?
: Go to step8N6.
: Repair harness between G sensor and ABSCM.
B4M0914A
8N6
CHECK BATTERY SHORT OF HARNESS.
1) Turn ignition switch to ON.
2) Measure voltage between ABSCM connector and chas-
sis ground.
: Connector & terminal
(F49) No. 7 (+)—Chassis ground ()
Is voltage 0 V?
: Go to next step.
: Repair harness between G sensor and ABSCM.
3) Turn ignition switch to OFF.
4) Measure voltage between ABSCM connector and chas-
sis ground.
: Connector & terminal
(F49) No. 7 (+)—Chassis ground ()
Is voltage 0 V?
: Go to step8N7.
: Repair harness between G sensor and ABSCM.
108
4-4cBRAKES [ABS 5.3 TYPE]
8. Diagnostics Chart with Trouble Code