SUBARU LEGACY 1997 Service Repair Manual

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.
106
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

B4M0915
8N7
CHECK G SENSOR.
1) Remove G sensor from vehicle.
2) Connect connector to G sensor.
3) Connect connector to ABSCM.
4) Turn ignition switch to ON.
5) Measure voltage between G sensor connector termi-
nals.
: Connector & terminal
(P11) No. 2 (+)—No.1()
Is voltage 2.3±0.2 V when G sensor is hori-
zontal?
: Go to next.
: Replace G sensor.
B4M0917A
: Connector & terminal
(P11) No. 2 (+)—No.1()
Is voltage 3.9±0.2 V when G sensor is
inclined forwards to 90°?
: Go to next.
: Replace G sensor.
B4M0918A
: Connector & terminal
(P11) No. 2 (+)—No.1()
Is voltage 0.7±0.2 V when G sensor is
inclined backwards to 90°?
: Go to step8N8.
: Replace G sensor.
8N8CHECK POOR CONTACT IN CONNEC-
TOR BETWEEN ABSCM AND G SENSOR.
: Is there poor contact in connector between
ABSCM and G sensor?
: Repair connector.
: Go to step8N9.
109
4-4cBRAKES [ABS 5.3 TYPE]
8. Diagnostics Chart with Trouble Code

8N9
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.
11 0
4-4cBRAKES [ABS 5.3 TYPE]
8. Diagnostics Chart with Trouble Code

G2M0096
9. Select Monitor Function Mode
Applicable cartridge of select monitor: No. 498345700
A: LIST OF FUNCTION MODE
1. F MODE (ROM ID, ANALOG DATA ARE
DISPLAYED.)
Function code
Measuring items Contents to be monitored Scroll Ref. to
Code Abbreviation
F00 ROM ID ECM identificationROM ID number of ECM is read and enabled commu-
nication state is displayed.Possible 4-4c [T9B0]
F01 FRFR wheel speed
(mile/h)Wheel speed detected by the FR ABS sensor is dis-
played in mile/h.Possible 4-4c [T9C0]
F02 FLFL wheel speed
(mile/h)Wheel speed detected by the FL ABS sensor is dis-
played in mile/h.Possible 4-4c [T9D0]
F03 RRRR wheel speed
(mile/h)Wheel speed detected by the RR ABS sensor is dis-
played in mile/h.Possible 4-4c [T9E0]
F04 RLRL wheel speed
(mile/h)Wheel speed detected by the RL ABS sensor is dis-
played in mile/h.Possible 4-4c [T9F0]
F05 FRFR wheel speed
(km/h)Wheel speed detected by the FR ABS sensor is dis-
played in km/h.Possible 4-4c [T9C0]
F06 FLFL wheel speed
(km/h)Wheel speed detected by the FL ABS sensor is dis-
played in km/h.Possible 4-4c [T9D0]
F07 RRRR wheel speed
(km/h)Wheel speed detected by the RR ABS sensor is dis-
played in km/h.Possible 4-4c [T9E0]
F08 RLRL wheel speed
(km/h)Wheel speed detected by the RL ABS sensor is dis-
played in km/h.Possible 4-4c [T9F0]
F09 BLSStop light switch
monitorStop light switch monitor voltage is displayed. Possible 4-4c [T9G0]
F10 G-SENSG sensor output volt-
age (V)Refers to vehicle acceleration detecting by the analog
G sensor. It appears on the select monitor display in
volts.Possible4-4c [T9H0]
111
4-4cBRAKES [ABS 5.3 TYPE]
9. Select Monitor Function Mode

2. FA MODE (ON/OFF DATA ARE DISPLAYED.)
Function code
Measuring items Contents to be monitored Scroll Ref. to
Code Abbreviation
FA 0B1 Stop light switchLED 1 comes on with the switch on (with the brake
pedal down).
Possible 4-4c [T9I0] VR Valve relay signal LED 2 comes on with the valve relay off.
MR Motor relay signal LED 3 comes on with the motor on.
AT AT ABS signal LED 4 comes on when ABS control is on.
AW ABS warning light LED 6 comes on when the warning light is on.
VM Valve relay monitor LED 1 comes on with the valve relay off.
MM Motor relay monitor LED 8 comes on when the motor relay is on.
CM CCM signal LED 9 comes on when ABS control is on.
3. FB MODE (TROUBLE CODES ARE DISPLAYED.)
Function code
Measuring items Contents to be monitored Scroll Ref. to
Code Abbreviation
FB1D⋅ALL
History of trouble
codes is displayed.A maximum of 3 trouble codes are displayed in order
of occurrence.
Possible 4-4c [T10B0] D⋅NEWThe most recent trouble code appears on the select
monitor display.
D⋅MIDThe second most recent trouble code appears on the
select monitor display.
D⋅OLDThe third most recent trouble code appears on the
select monitor display.
B4M0919
NOTE:

If a particular trouble code is not properly stored in
memory (due to a drop in ABSCM power supply, etc.) when
a problem occurs, the trouble code, followed by a question
mark“?”, appears on the select monitor display. This shows
it may be an unreliable reading.

*a* refers to the troubles in order of occurrence (NEW.
MID and OLD).
11 2
4-4cBRAKES [ABS 5.3 TYPE]
9. Select Monitor Function Mode

4. FC MODE (TROUBLE CODES AND FREEZE
FRAME DATA ARE ERASED.)
Function code
Measuring items Contents to be monitored Scroll Ref. to
Code Abbreviation
FC0 D⋅CLRHistory of trouble
codes is erased.Function of clearing trouble code. Possible 4-4c [T9J0]
5. FD MODE (ABS SEQUENCE CHECK MODE)
Function code
Measuring items Contents to be monitored Scroll Ref. to
Code Abbreviation
FD1 A⋅CHKABS sequence con-
trolPerform ABS sequence control by operating valve and
pump motor sequentially.Impossible4-4
[W20D0]
6. FE MODE (FREEZE FRAME DATA)
NOTE:
Data stored at the time of trouble occurrence is shown on
display.
Function code
Measuring items Contents to be monitored Scroll Ref. to
Code Abbreviation
FE1 FR FR wheel speed (mile/h)Wheel speed detected by the FR ABS sensor is displayed in
mile/h.Possible 4-4c [T9K0]
FE2 FL FL wheel speed (mile/h)Wheel speed detected by the FL ABS sensor is displayed in
mile/h.Possible 4-4c [T9L0]
FE3 RR RR wheel speed (mile/h)Wheel speed detected by the RR ABS sensor is displayed in
mile/h.Possible 4-4c [T9M0]
FE4 RL RL wheel speed (mile/h)Wheel speed detected by the RL ABS sensor is displayed in
mile/h.Possible 4-4c [T9N0]
FE5 FR FR wheel speed (km/h)Wheel speed detected by the FR ABS sensor is displayed in
km/h.Possible 4-4c [T9K0]
FE6 FL FL wheel speed (km/h)Wheel speed detected by the FL ABS sensor is displayed in
km/h.Possible 4-4c [T9L0]
FE7 RR RR wheel speed (km/h)Wheel speed detected by the RR ABS sensor is displayed in
km/h.Possible 4-4c [T9M0]
FE8 RL RL wheel speed (km/h)Wheel speed detected by the RL ABS sensor is displayed in
km/h.Possible 4-4c [T9N0]
FE13 POWERABSCM power supply
voltage (V)Power (in volts) supplied to ABSCM appears on the select
monitor display.Possible 4-4c [T9O0]
FE14 G-SENSG sensor output voltage
(V)Refers to vehicle acceleration detected by the analog G sen-
sor. It appears on the select monitor display in volts.Possible 4-4c [T9P0]
FE15MM Motor relay monitor LED 1 comes on when motor relay is on.
Possible 4-4c [T9Q0] B1 Stop light switchLED 2 comes on with the stop light switch on (with the brake
pedal depressed).
AT AT ABS signal LED 3 comes on when ABS control is on.
CM CCM signal LED 4 comes on when ABS control is on.
A0 ABS control LED 5 comes on when ABS control is on.
11 3
4-4cBRAKES [ABS 5.3 TYPE]
9. Select Monitor Function Mode

1) When a trouble code is not stored in memory, activat-
ing the FE mode causes the initial value to appear on the
select monitor display.

FE1—4: 159 mile/h

FE5—8: 255 km/h

FE13: 16.84 V

FE14: 5.00 V

FE15: The MM, B1 and A0 LEDs are on.
The AT and CM LEDs are out.
B4M0920
2) If freeze frame data is not properly stored in memory
(due to a drop in ABSCM power supply, etc.), a trouble
code, preceded by a question mark“?”, appears on the
select monitor display. This shows it may be an unreliable
reading.
3) When a trouble code is detected in the FE mode, a
question mark“?”appears continuously on the select moni-
tor display until the freeze frame data is stored in memory.
B4M0921
B: MODE F00
—ROM ID NUMBER (ROM)—
CONDITION:
Ignition switch ON
SPECIFIED DATA:
Presentation display

Probable cause (Item outside“specified data”)
1. Error 1
Check for loose or disconnected connector, and
discontinued circuit, etc.
2. Error 2Check for poor contact of cartridge, or different type
cartridge.
11 4
4-4cBRAKES [ABS 5.3 TYPE]
9. Select Monitor Function Mode

B4M0922
C: MODE F01 AND F05
—FRONT RIGHT WHEEL SPEED SIGNAL
(FR)—

Compare speedometer with monitor indications.

F01: FR wheel speed is indicated in mile per hour (mile/
h).

F05: FR wheel speed is indicated in kilometer per hour
(km/h).
NOTE:
The monitor as shown, indicates that FR wheel speed is 30
km/h.
B4M0923
D: MODE F02 AND F06
—FRONT LEFT WHEEL SPEED SIGNAL
(FL)—

Compare speedometer with monitor indications.

F02: FL wheel speed is indicated in mile per hour (mile/
h).

F06: FL wheel speed is indicated in kilometer per hour
(km/h).
NOTE:
The monitor as shown, indicates that FL wheel speed is 29
km/h.
11 5
4-4cBRAKES [ABS 5.3 TYPE]
9. Select Monitor Function Mode