SUBARU LEGACY 1997 Service Repair Manual

B4M0430
10C1
CHECK GENERATOR.
1) Start the engine.
2) Idle the engine.
3) Measure voltage between generator and chassis
ground.
: Terminal
Generator B terminal (+)—Chassis ground
():
Is voltage 10—15 V?
: Go to step10C2.
: Repair generator.
10C2
CHECK BATTERY TERMINAL.
Turn ignition switch to OFF.
: Is there poor contact at battery terminal?
: Repair battery terminal.
: Go to step10C3.
10C3CHECK COMMUNICATION OF SELECT
MONITOR.
Using the select monitor, check whether communication to
other system (such as engine, AT, etc.) can be executed
normally.
: Are the name and year of the system dis-
played on the select monitor?
: Go to step10C4.
: Repair select monitor communication cable and
connector.
10C4CHECK INSTALLATION OF ABSCM CON-
NECTOR.
Turn ignition switch to OFF.
: Is ABSCM connector inserted into ABSCM
until the clamp locks onto it?
: Go to step10C5.
: Insert ABSCM connector into ABSCM until the
clamp locks onto it.
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10. Diagnostics Chart with Select Monitor

B4M0796A
10C5
CHECK POWER SUPPLY OF ABSCM.
1) Disconnect connector from ABSCM.
2) Start engine.
3) Idle the engine.
4) Measure voltage between ABSCM connector and chas-
sis ground.
: Connector & terminal
(F49) No. 28 (+)—Chassis ground ():
Is voltage 10—15 V?
: Go to step10C6.
: Repair ABSCM power supply circuit.
B4M0797A
10C6
CHECK GROUND CIRCUIT OF ABSCM.
1) Turn ignition switch to OFF.
2) Measure resistance between ABSCM connector and
chassis ground.
: Connector & terminal
(F49) No. 1—Chassis ground:
(F49) No. 55—Chassis ground:
Is resistance less than 0.5Ω?
: Repair harness/connector between ABSCM and
select monitor.
: Go to step10C7.
127
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

B4M1033B
10C7CHECK HARNESS CONNECTOR
BETWEEN ABSCM AND DATA LINK CON-
NECTOR.
1) Turn ignition switch OFF.
2) Measure resistance between ABSCM connector and
data link connector.
: Connector & terminal
(F49) No. 11—(B78) No. 3
(F49) No. 38—(B78) No. 2
Is resistance less than 0.5Ω?
: Repair harness and connector between ABSCM
and data link connector.
: Go to step10C8.
10C8CHECK POOR CONTACT IN CONNEC-
TOR BETWEEN ABSCM AND DATA LINK
CONNECTOR.
: Is there poor contact in connectors between
ABSCM and data link connector?
: Repair connector.
: Replace ABSCM.
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10. Diagnostics Chart with Select Monitor

B4M0944
D: NO TROUBLE
—ALTHOUGH NO TROUBLE APPEARS ON
THE SELECT MONITOR DISPLAY, THE ABS
WARNING LIGHT REMAINS ON.—
DIAGNOSIS:

ABS warning light circuit is shorted.
TROUBLE SYMPTOM:

ABS warning light remains on.

NO TROUBLE displayed on the select monitor.
NOTE:
When the ABS warning light is OFF and“NO TROUBLE”
is displayed on the select monitor, the system is in normal
condition.
10D1.Check ground short of harness.
10D2.Check ground short of relay box.

129
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10. Diagnostics Chart with Select Monitor

WIRING DIAGRAM:
B4M1034
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10. Diagnostics Chart with Select Monitor

10D1
CHECK GROUND SHORT OF HARNESS.
1) Turn ignition switch to OFF.
2) Disconnect connector from ABSCM.
3) Disconnect connector (F50) from relay box.
4) Turn ignition switch to ON.
: Does the ABS warning light remain OFF?
: Go to step10D2.
: Repair harness between ABSCM, relay box ABS
warning light.
10D2CHECK GROUND SHORT OF RELAY
BOX.
1) Turn ignition switch to OFF.
2) Connect connector (F50) to relay box.
3) Disconnect connector (ABS1) from hydraulic unit.
4) Remove valve relay from relay box.
5) Turn ignition switch to ON.
: Does the ABS warning light remain OFF?
: Replace ABSCM.
: Replace relay box.
131
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

B4M0945
E: 21 FR. SS HARD
—ABNORMAL FRONT RH ABS SENSOR
(OPEN CIRCUIT OR INPUT VOLTAGE TOO
HIGH)—
B4M0946
F: 23 FL. SS HARD
—ABNORMAL FRONT LH ABS SENSOR
(OPEN CIRCUIT OR INPUT VOLTAGE TOO
HIGH)—
B4M0947
G: 25 RR. SS HARD
—ABNORMAL REAR RH ABS SENSOR
(OPEN CIRCUIT OR INPUT VOLTAGE TOO
HIGH)—
B4M0948
H: 27 RL. SS HARD
—ABNORMAL REAR LH ABS SENSOR
(OPEN CIRCUIT OR INPUT VOLTAGE TOO
HIGH)—
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10. Diagnostics Chart with Select Monitor

DIAGNOSIS:

Faulty ABS sensor (Broken wire, input voltage too high)

Faulty harness connector
TROUBLE SYMPTOM:

ABS does not operate.
10H1.Check output of ABS sensor using select
monitor.

10H2.Check ABS sensor mechanical trouble.
10H3.Check poor contact in connector between
ABSCM and ABS sensor.
10H4.Check ABSCM.
10H5.Check resistance of ABS sensor.
10H6.Check battery short of ABS sensor.
10H7.Check harness connector between ABSCM
and ABS sensor.
10H8.Check battery short of harness.
10H9.Check ABS sensor mechanical trouble.
10H10.Check poor contact in connector between
ABSCM and ABS sensor.
10H11.Check ABSCM.









133
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10. Diagnostics Chart with Select Monitor

WIRING DIAGRAM:
B4M1035
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10. Diagnostics Chart with Select Monitor

B4M0922
10H1CHECK OUTPUT OF ABS SENSOR
USING SELECT MONITOR.
Read the ABS sensor output corresponding to the faulty
system in the select monitor function mode.
NOTE:
The select monitor display shows that the front right wheel
is rotating at 30 km/h.
: Does the speed indicated on the display
change in response to the speedometer
reading during acceleration/deceleration
when the steering wheel is in the straight-
ahead position?
: Go to step10H2.
: Go to step10H5.
10H2CHECK ABS SENSOR MECHANICAL
TROUBLE.
: Tightening torque:
32±10 N⋅m (3.3±1.0 kg-m, 24±7 ft-lb)
Are the ABS sensor installation bolts tight-
ened securely?
: Go to next.
: Tighten ABS sensor installation bolts securely.
: Tightening torque:
13±3 N⋅m (1.3±0.3 kg-m, 9±2.2 ft-lb)
Are the tone wheel installation bolts tight-
ened securely?
: Go to next step.
: Tighten tone wheel installation bolts securely.
G4M0700
1) Measure tone wheel-to-pole piece gap over entire
perimeter of the wheel.
: Is the gap within the specifications shown
in the following table?
SpecificationsFront wheel Rear wheel
0.9—1.4 mm
(0.035—0.055 in)0.7—1.2 mm
(0.028—0.047 in)
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10. Diagnostics Chart with Select Monitor