Subaru Legacy III (2000-2003 year). Service manual — part 703
ABS-30
ABS (DIAGNOSTICS)
DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
6
CHECK BATTERY SHORT OF ABS WARN-
ING LIGHT HARNESS.
1) Turn ignition switch to OFF.
2) Measure voltage between connector (F45)
or (F2) and chassis ground.
Connector & terminal
LHD: (F45) No. 5 (+) — Chassis ground
(
−−−−
):
RHD: (F2) No. 18 (+) — Chassis ground
(
−−−−
):
Is the measured value less than the speci-
fied value?
3 V
Repair wiring har-
ness.
7
CHECK BATTERY SHORT OF ABS WARN-
ING LIGHT HARNESS.
1) Turn ignition switch to ON.
2) Measure voltage between connector (F45)
or (F2) and chassis ground.
Connector & terminal
LHD: (F45) No. 5 (+) — Chassis ground
(
−−−−
):
RHD: (F2) No. 18 (+) — Chassis ground
(
−−−−
):
Is the measured value less than the speci-
fied value?
3 V
Repair wiring har-
ness.
8
CHECK GROUND CIRCUIT OF ABSCM&H/U.
Measure resistance between ABSCM&H/U
and chassis ground.
Connector & terminal
(F49) No. 23 — GND:
Is the measured value less than the specified
value?
0.5
Ω
Repair
ABSCM&H/U
ground harness.
9
CHECK WIRING HARNESS.
Measure resistance between connector (F45)
or (F2) and chassis ground.
Connector & terminal
LHD: (F45) No. 5 — Chassis ground:
RHD: (F2) No. 18— Chassis ground:
Is the measured value less than the specified
value?
0.5
Ω
Repair harness/
connector.
10
CHECK POOR CONTACT IN CONNECTORS.
Turn ignition switch to OFF.
Is there poor contact in connectors between
combination meter and ABSCM&H/U?
There is no poor contact.
Replace
ABSCM&H/U.
<Ref. to ABS-6,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
Repair connector.
Step
Value
Yes
No
ABS-31
ABS (DIAGNOSTICS)
DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
MEMO:
ABS-32
ABS (DIAGNOSTICS)
DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
B: ABS WARNING LIGHT DOES NOT GO OFF.
DIAGNOSIS:
• ABS warning light circuit is open or shorted.
TROUBLE SYMPTOM:
• When starting the engine and while ABS warning light is kept ON.
WIRING DIAGRAM:
ABS00308
24
1
23
5
4
18
20
22
4
ABS CONTROL MODULE AND HYDRAULIC CONTROL UNIT
F49
B82
B81
8
DIAGNOSIS
TERMINAL
DIAGNOSIS
CONNECTOR
B36
B4 B5 B6
A4 A5 A6
C5 C6
F6
D4 D5 D6
F1
H1
C4
G6
G1
C2
K1
M1 M2
K6
L1
D1 D2
A1 A2
B1 B2
I6
J6
L2
I1
J1
H6
M4 M5 M6
L4 L5 L6
N5 N6
O4 O5 O6
N4
P4 P5
N2
O1 O2
P1 P2
N3
O3
P3
P6
A3
B3
C3
E4 E5 E6
E1 E2
i10
1 2 3 4 5 6 7
8 9 10 11 12 13 14
15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
16 17 18 19 20 21 22
27 28 29 30 31
23
24
25
26
F49
B82
1 2
4 5 6 7
3
8
i12
1 2 3
4 5 6
7 8 9 10 11 12 13 14
NO
. 8 30A
NO
. 18 15A
BATTERY
SBF-1 100A
SBF-3 50A
SBF-4 50A
IGNITION
SWITCH
COMBINATION
METER
ABS
WARNING
LIGHT
B:
i11
C:
i12
A:
i10
G1
i1
B36
GENERATOR
B5
IGNITION
RELAY
NO
. 5 15A
F45
1 2 3
4 5 6 7
8 9 10 11
12 13 14 15 16
TB
1
*
2
*
3
*
4
*
RHD
LHD
1
*
2
*
3
*
:TURBO A8
NA C3
: LHD
RHD
: TURBO B2
NA C11
: TURBO
ENGINE
MODEL
4
*
: LHD
RHD
TB
F2
F45
B100
B62
1 2 3
8 9 10
4
11 12 13 14 15 16
5 6 7
B:
i11
F2
3 4
1 2
8 9 10 11
12 13 14 15 16 17 18 19 20 21 22 23 24
5 6
7
ABS-33
ABS (DIAGNOSTICS)
DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
Step
Value
Yes
No
1
CHECK INSTALLATION OF ABSCM&H/U
CONNECTOR.
Turn ignition switch to OFF.
Is ABSCM&H/U connector inserted into
ABSCM until the clamp locks onto it?
Connector is locked securely.
Insert ABSCM&H/
U connector into
ABSCM&H/U until
the clamp locks
onto it.
2
CHECK DIAGNOSIS TERMINAL.
Measure resistance between diagnosis termi-
nals (B81) and chassis ground.
Terminals
Diagnosis terminal (A) — Chassis
ground:
Diagnosis terminal (B) — Chassis
ground:
Is the measured value less than the specified
value?
0.5
Ω
Repair diagnosis
terminal harness.
3
CHECK DIAGNOSIS LINE.
1) Turn ignition switch to OFF.
2) Connect diagnosis terminal (B81) to diag-
nosis connector (B82) No. 8.
3) Disconnect connector from ABSCM&H/U.
4) Measure resistance between ABSCM&H/U
connector and chassis ground.
Connector & terminal
(F49) No. 4 — Chassis ground:
Is the measured value less than the speci-
fied value?
0.5
Ω
Repair harness
connector
between
ABSCM&H/U and
diagnosis connec-
tor.
4
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 the measured value within the specified
range?
10 - 15 V
Repair generator.
H4 engine model:
<Ref. to
SC(H4SO)-14,
Generator.>
H6 engine model:
<Ref. to
SC(H6DO)-14,
Generator.>
5
CHECK BATTERY TERMINAL.
Turn ignition switch to OFF.
Is there poor contact at battery terminal?
There is no poor contact.
Repair battery ter-
minal.
6
CHECK POWER SUPPLY OF ABSCM.
1) Disconnect connector from ABSCM&H/U.
2) Start engine.
3) Idle the engine.
4) Measure voltage between ABSCM&H/U
connector and chassis ground.
Connector & terminal
(F49) No. 1 (+) — Chassis ground (
−−−−
):
Is the measured value within the specified
range?
10 - 15 V
Repair
ABSCM&H/U
power supply cir-
cuit.
7
CHECK WIRING HARNESS.
1) Disconnect connector (F45) from connector
(B62).
2) Turn ignition switch to ON.
Does the ABS warning light turn on?
ABS warning light remains off. Go to step 8.
Repair front wiring
harness.
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