1996 SUBARU LEGACY Brakes

10. Diagnostics Chart with Select
Monitor
A: BASIC DIAGNOSTIC CHART
TROUBLE OCCURS.
Is Select Monitor available?
Ye s
No
Diagnostics Chart for On-board
Diagnosis System

Ask the customer when and how
the trouble occurred using
interview check list.

PRE-INSPECTION

Use select monitor, retrieve
trouble code in function mode
FB1 and record the code.
Perform diagnostics in accordance with trouble code.
No corresponding trouble
code

Inspection using General
Diagnostics Chart

Trouble code
is designated
or ABS warning
light constantly
remains on.

Repair.
Clear memory.

INSPECTION MODE

Use select monitor, retrieve trouble code in function
mode FB1 and record the code.
No trouble code is designated and
ABS warning light goes out after turning on.
CONFIRMATION TEST
END
NOTE:
To check harness for broken wires or short circuits, shake
it while holding it or the connector.











123
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

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.
124
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.







125
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

WIRING DIAGRAM:
B4M1043
126
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.
127
4-4cBRAKES [ABS 5.3 TYPE]
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.
128
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.
129
4-4cBRAKES [ABS 5.3 TYPE]
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.

130
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor