1997 SUBARU LEGACY light

8Y1CHECK 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 step8Y2.
B4M1248A
8Y2CHECK SPECIFICATIONS OF
ABSCM&H/U.
Check specifications of the mark to the ABSCM&H/U.
Mark Model
C3 AWD AT
C4 AWD MT
: Is an ABSCM for AWD model installed on a
FWD model?
CAUTION:
Be sure to turn ignition switch to OFF when removing
ABSCM&H/U.
: Replace ABSCM&H/U.
: Go to step8Y3.
B4M0911B
8Y3
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 the voltage between 4.75 and 5.25 V?
: Go to step8Y4.
: Repair harness/connector between G sensor and
ABSCM&H/U.
73
4-4dBRAKES [ABS 5.3i TYPE]
8. Diagnostics Chart with Trouble Code by ABS Warning Light

B4M1261A
8Y4CHECK OPEN CIRCUIT IN G SENSOR
OUTPUT HARNESS AND GROUND HAR-
NESS.
1) Turn ignition switch to OFF.
2) Disconnect connector from ABSCM&H/U.
3) Measure resistance between ABSCM&H/U connector
terminals.
Connector & terminal
(F49) No. 30—No. 28:
: Is the resistance between 4.3 and 4.9 kΩ?
: Go to step8Y5.
: Repair harness/connector between G sensor and
ABSCM&H/U.
B4M1262A
8Y5CHECK GROUND SHORT IN G SENSOR
OUTPUT HARNESS.
1) Disconnect connector from G sensor.
2) Measure resistance between ABSCM&H/U connector
and chassis ground.
Connector & terminal
(F49) No. 6—Chassis ground:
: Is the resistance more than 1 MΩ?
: Go to step8Y6.
: Repair harness between G sensor and
ABSCM&H/U.
B4M1263A
8Y6
CHECK BATTERY SHORT OF HARNESS.
Measure voltage between ABSCM&H/U connector and
chassis ground.
Connector & terminal
(F49) No. 6 (+)—Chassis ground ():
: Is the voltage less than 1 V?
: Go to step8Y7.
: Repair harness between G sensor and
ABSCM&H/U.
74
4-4dBRAKES [ABS 5.3i TYPE]
8. Diagnostics Chart with Trouble Code by ABS Warning Light

B4M1263A
8Y7
CHECK BATTERY SHORT OF HARNESS.
1) Turn ignition switch to ON.
2) Measure voltage between ABSCM&H/U connector and
chassis ground.
Connector & terminal
(F49) No. 6 (+)—Chassis ground ():
: Is the voltage less than 1 V?
: Go to step8Y8.
: Repair harness between G sensor and
ABSCM&H/U.
B4M1264A
8Y8
CHECK GROUND SHORT OF HARNESS.
Measure resistance between ABSCM&H/U connector and
chassis ground.
Connector & terminal
(F49) No. 28—Chassis ground:
: Is the resistance more than 1 MΩ?
: Go to step8Y9.
: Repair harness between G sensor and
ABSCM&H/U.
Replace ABSCM&H/U.
75
4-4dBRAKES [ABS 5.3i TYPE]
8. Diagnostics Chart with Trouble Code by ABS Warning Light

B4M0915
8Y9
CHECK G SENSOR.
1) Turn ignition switch to OFF.
2) Remove G sensor from vehicle.
3) Connect connector to G sensor.
4) Connect connector to ABSCM&H/U.
5) Turn ignition switch to ON.
6) Measure voltage between G sensor connector termi-
nals.
Connector & terminal
(P11) No. 2 (+)—No.1():
: Is the voltage between 2.1 and 2.4 V when G
sensor is horizontal?
: Go to step8Y10.
: Replace G sensor.
B4M0917A
8Y10
CHECK G SENSOR.
Measure voltage between G sensor connector terminals.
Connector & terminal
(P11) No. 2 (+)—No.1():
: Is the voltage between 3.7 and 4.1 V when G
sensor is inclined forwards to 90°?
: Go to step8Y11.
: Replace G sensor.
B4M0918A
8Y11
CHECK G SENSOR.
Measure voltage between G sensor connector terminals.
Connector & terminal
(P11) No. 2 (+)—No.1():
: Is the voltage between 0.5 and 0.9 V when G
sensor is inclined backwards to 90°?
: Go to step8Y12.
: Replace G sensor.
8Y12CHECK POOR CONTACT IN CONNEC-
TORS.
: Is there poor contact in connector between
ABSCM&H/U and G sensor? WORD [T3C1].>
: Repair connector.
: Go to step8Z12.
76
4-4dBRAKES [ABS 5.3i TYPE]
8. Diagnostics Chart with Trouble Code by ABS Warning Light

8Y13
CHECK ABSCM&H/U.
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&H/U.
: Go to step8Y14.
8Y14CHECK ANY OTHER TROUBLE CODES
APPEARANCE.
: Are other trouble codes being output?
: Proceed with the diagnosis corresponding to the
trouble code.
: A temporary poor contact.
77
4-4dBRAKES [ABS 5.3i TYPE]
8. Diagnostics Chart with Trouble Code by ABS Warning Light

G2M0096
9. Select Monitor Function Mode
Applicable cartridge of select monitor: No. 498346300
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 com-
munication state is displayed.Possible 4-4d [T9B0]
F01 FRFR wheel speed
(mile/h)Wheel speed detected by the FR ABS sensor is
displayed in mile/h.Possible 4-4d [T9C0]
F02 FLFL wheel speed
(mile/h)Wheel speed detected by the FL ABS sensor is dis-
played in mile/h.Possible 4-4d [T9D0]
F03 RRRR wheel speed
(mile/h)Wheel speed detected by the RR ABS sensor is
displayed in mile/h.Possible 4-4d [T9E0]
F04 RLRL wheel speed
(mile/h)Wheel speed detected by the RL ABS sensor is
displayed in mile/h.Possible 4-4d [T9F0]
F05 FRFR wheel speed
(km/h)Wheel speed detected by the FR ABS sensor is
displayed in km/h.Possible 4-4d [T9C0]
F06 FLFL wheel speed
(km/h)Wheel speed detected by the FL ABS sensor is dis-
played in km/h.Possible 4-4d [T9D0]
F07 RRRR wheel speed
(km/h)Wheel speed detected by the RR ABS sensor is
displayed in km/h.Possible 4-4d [T9E0]
F08 RLRL wheel speed
(km/h)Wheel speed detected by the RL ABS sensor is
displayed in km/h.Possible 4-4d [T9F0]
F09 BLSStop light switch
monitorStop light switch monitor voltage is displayed. Possible 4-4d [T9G0]
F10 G-SENSG sensor output volt-
age (V)Refers to vehicle acceleration detecting by the ana-
log G sensor. It appears on the select monitor dis-
play in volts.Possible 4-4d [T9H0]
78
4-4dBRAKES [ABS 5.3i 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 4-4d [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 4-4d [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.
D⋅REFA specified period of time proceeding 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&H/U 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.

arefers to the troubles in order of occurrence (NEW.
MID, OLD and REF).
79
4-4dBRAKES [ABS 5.3i TYPE]
9. Select Monitor Function Mode

4. FC MODE (TROUBLE CODES 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 4-4d [T9J0]
5. FD MODE (ABS SEQUENCE CONTROL 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
[W20D2]
6. FE MODE (FREEZE FRAME DATA)
NOTE:

Data stored at the time of trouble occurrence is shown
on display.

Each time trouble occurs, the latest information is stored
in the freeze frame data in memory.
Function code
Measuring items Contents to be monitored Scroll Ref. to
Code Abbreviation
FE1 FRFR wheel speed
(mile/h)Wheel speed detected by the FR ABS sensor is
displayed in mile/h.Possible 4-4d [T9K0]
FE2 FLFL wheel speed
(mile/h)Wheel speed detected by the FL ABS sensor is dis-
played in mile/h.Possible 4-4d [T9L0]
FE3 RRRR wheel speed
(mile/h)Wheel speed detected by the RR ABS sensor is
displayed in mile/h.Possible 4-4d [T9M0]
FE4 RLRL wheel speed
(mile/h)Wheel speed detected by the RL ABS sensor is
displayed in mile/h.Possible 4-4d [T9N0]
FE5 FRFR wheel speed
(km/h)Wheel speed detected by the FR ABS sensor is
displayed in km/h.Possible 4-4d [T9K0]
FE6 FLFL wheel speed
(km/h)Wheel speed detected by the FL ABS sensor is dis-
played in km/h.Possible 4-4d [T9L0]
FE7 RRRR wheel speed
(km/h)Wheel speed detected by the RR ABS sensor is
displayed in km/h.Possible 4-4d [T9M0]
FE8 RLRL wheel speed
(km/h)Wheel speed detected by the RL ABS sensor is
displayed in km/h.Possible 4-4d [T9N0]
FE13 POWERABSCM&H/U power
supply voltage (V)Power (in volts) supplied to ABSCM&H/U appears
on the select monitor display.Possible 4-4d [T9O0]
FE14 G-SENSG sensor output volt-
age (V)Refers to vehicle acceleration detected by the ana-
log G sensor. It appears on the select monitor dis-
play in volts.Possible 4-4d [T9P0]
FE15MM Motor relay monitor LED 1 comes on when motor relay is on.
Possible 4-4d [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.
FE16 CODE Trouble codeThe most recent trouble code appears on select
monitor display.Possible 4-4d [T9R0]
80
4-4dBRAKES [ABS 5.3i TYPE]
9. Select Monitor Function Mode