1997 SUBARU LEGACY battery

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.
94
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

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

N: TROUBLE CODE 56
—ABNORMAL G SENSOR OUTPUT
VOLTAGE—
DIAGNOSIS:

Faulty G sensor output voltage
TROUBLE SYMPTOM:

ABS does not operate.
8N1.Check all four wheels for free turning.
8N2.Check specifications of ABSCM.
8N3.Check input voltage of G sensor.
8N4.Check broken wire in G sensor output harness
and ground harness.
8N5.Check ground short in G sensor output
harness.
8N6.Check battery short of harness.
8N7.Check G sensor.
8N8.Check poor contact in connector between
ABSCM and G sensor.
8N9.Check ABSCM.








105
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

B: LIST OF TROUBLE CODE
Code Display screen (FB1) Contents of diagnosis Ref. to
—ERROR 3 (1) Select monitor communication failure 4-4c [T10C0]
11 NO TROUBLEAlthough no trouble appears on the select monitor display, the ABS
warning light remains on.4-4c [T10D0]
21 FR. SS HARD Open circuit or input voltage too high of FR sensor 4-4c [T10E0]
22 FR. SS SOFT Abnormal ABS sensor signal of FR sensor 4-4c [T10I0]
23 FL. SS HARD Open circuit or input voltage too high of FL sensor 4-4c [T10F0]
24 FL. SS SOFT Abnormal ABS sensor signal of FL sensor 4-4c [T10J0]
25 RR. SS HARD Open circuit or input voltage too high of RR sensor 4-4c [T10G0]
26 RR. SS SOFT Abnormal ABS sensor signal of RR sensor 4-4c [T10K0]
27 RL. SS HARD Open circuit or input voltage too high of RL sensor 4-4c [T10H0]
28 RL. SS SOFT Abnormal ABS sensor signal of RL sensor 4-4c [T10L0]
29 EITHER. SS SOFT Abnormal ABS sensor signal (any one of four) 4-4c [T10M0]
31 FR. EV VALVE Abnormal FR inlet valve 4-4c [T10N0]
32 FR. AV VALVE Abnormal FR outlet valve 4-4c [T10R0]
33 FL. EV VALVE Abnormal FL inlet valve 4-4c [T10O0]
34 FL. AV VALVE Abnormal FL outlet valve 4-4c [T10S0]
35 RR. EV VALVE Abnormal RR inlet valve 4-4c [T10P0]
36 RR. AV VALVE Abnormal RR outlet valve 4-4c [T10T0]
37 RL. EV VALVE Abnormal RL inlet valve 4-4c [T10Q0]
38 RL. AV VALVE Abnormal RL outlet valve 4-4c [T10U0]
41 ECU Abnormal ABSCM 4-4c [T10V0]
42 LOW VOLTAGE Source voltage is low. 4-4c [T10W0]
44CCM LINE A combination of AT control abnormals (ABS not in control) 4-4c [T10X0]
CCM OPEN A combination of AT control abnormals (ABS in control) 4-4c [T10Y0]
46GS POWER OVER G sensor line voltage too high 4-4c [T10Z0]
GS POWER LOW G sensor line voltage too low 4-4c [T10AA0]
51V. RELAY Abnormal valve relay 4-4c [T10AB0]
V. RELAY ON Valve relay ON failure 4-4c [T10AC0]
52M. RELAY OPEN Open circuit of motor relay 4-4c [T10AD0]
M. RELAY ON Motor relay ON failure 4-4c [T10AE0]
MOTOR Abnormal motor 4-4c [T10AF0]
54 BLS Abnormal stop light switch 4-4c [T10AG0]
56G SENSOR LINE Open or short circuit of G sensor 4-4c [T10AH0]
G SENSOR +B Battery short of G sensor 4-4c [T10AI0]
G SENSOR Hµ Abnormal G sensor high µ output 4-4c [T10AJ0]
G SENSOR STICK G sensor output is stuck. 4-4c [T10AK0]
NOTE:
High µ means high friction coefficient against road sur-
face.
123
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

B4M0943
C: ERROR 3 (1)
—SELECT MONITOR COMMUNICATION
FAILURE—
DIAGNOSIS:

Faulty harness connector
TROUBLE SYMPTOM:

ABS warning light remains on.

ERROR 3 or 1 appears on the select monitor display.
10C1.Check generator.
10C2.Check battery terminal.
10C3.Check communication of select monitor.
10C4.Check installation of ABSCM connector.
10C5.Check power supply of ABSCM.
10C6.Check ground circuit of ABSCM.
10C7.Check harness connector between ABSCM
and data link connector.
10C8.Check poor contact in connector between
ABSCM and data link connector.







124
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

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.
126
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor