Subaru Legacy III (2000-2003 year). Service manual — part 280
CO(H6DO)-18
COOLING
RADIATOR SUB FAN SYSTEM
18
CHECK POWER SUPPLY TO SUB FAN MO-
TOR.
CAUTION:
Be careful not to overheat engine during re-
pair.
1) Turn ignition switch to OFF.
2) Disconnect sub fan motor connector.
3) Start the engine, and perform checking pro-
cedure during coolant temperature is 98 —
101
°
C (208 — 214
°
F).
4) Measure voltage between sub fan motor
connector and chassis ground.
Connector & terminal
(F16) No. 1 (+) — Chassis ground (
−−−−
):
Does the measured value exceed the spec-
ified value?
10 V
19
CHECK POOR CONTACT.
Check poor contact in sub fan motor connec-
tor.
Is there poor contact in sub fan motor connec-
tor?
There is poor contact.
Repair poor con-
tact in sub fan
motor connector.
20
CHECK SUB FAN MOTOR.
Connect battery positive (+) terminal to termi-
nal No. 1, and negative (
−
) terminal to terminal
No. 4 of sub fan motor connector.
Does the sub fan rotate?
Rotates.
Repair poor con-
tact in sub fan
motor connector.
Replace sub fan
motor with a new
one.
21
CHECK POWER SUPPLY TO SUB FAN RE-
LAY 1.
1) Turn ignition switch to OFF.
2) Remove sub fan relay 1 from A/C relay
holder.
3) Measure voltage between sub fan relay 1
terminal and chassis ground.
Connector & terminal
(F28) No. 28 (+) — Chassis ground (
−−−−
):
Does the measured value exceed the spec-
ified value?
10 V
22
CHECK POWER SUPPLY TO SUB FAN RE-
LAY 1.
1) Turn ignition switch to ON.
2) Measure voltage between sub fan relay 1
terminal and chassis ground.
Connector & terminal
(F28) No. 25 (+) — Chassis ground (
−−−−
):
Does the measured value exceed the spec-
ified value?
10 V
23
CHECK 30 A FUSE.
1) Remove 30 A fuse from A/C relay holder.
2) Check condition of fuse.
Is the fuse blown-out?
Fuse is blown-out.
Replace fuse.
24
CHECK POWER SUPPLY TO A/C RELAY
HOLDER 30 A FUSE TERMINAL.
Measure voltage of harness between A/C relay
holder 30 A fuse terminal and chassis ground.
Connector & terminal
(F27) No. 3(+) — Chassis ground (
−−−−
):
Does the measured value exceed the specified
value?
10 V
Repair open circuit
in harness
between 30 A fuse
and sub fan relay
1 terminal.
Repair open circuit
in harness
between main fuse
box connector and
30 A fuse terminal.
Step
Value
Yes
No
CO(H6DO)-19
COOLING
RADIATOR SUB FAN SYSTEM
25
CHECK FUSE.
1) Turn ignition switch to OFF.
2) Remove fuse No. 17 from joint box.
3) Check condition of fuse.
Is the fuse blown-out?
Fuse is blown-out.
Replace fuse.
Repair open circuit
in harness
between sub fan
relay 1 and ignition
switch.
26
CHECK SUB FAN RELAY 1.
1) Turn ignition switch to OFF.
2) Remove sub fan relay 1.
3) Measure resistance of sub fan relay 1.
Terminal
No. 28 — No. 29:
Does the measured value exceed the spec-
ified value?
1 M
Ω
Replace sub fan
relay 1.
27
CHECK SUB FAN RELAY.
1) Connect battery to terminals No. 25 and
No. 27 of sub fan relay 1.
2) Measure resistance of sub fan relay 1.
Terminal
No. 28 — No. 29:
Is the measured value less than the speci-
fied value?
1
Ω
Replace sub fan
relay 1.
28
CHECK HARNESS BETWEEN SUB FAN RE-
LAY 1 AND SUB FAN MOTOR CONNECTOR.
Measure resistance of harness between sub
fan motor connector and sub fan relay 1 termi-
nal.
Connector & terminal
(F16) No. 1 — (F28) No. 29:
Is the measured value less than the specified
value?
1
Ω
Replace open cir-
cuit in harness
between sub fan
motor connector
and sub fan relay
1 terminal.
29
CHECK HARNESS BETWEEN SUB FAN RE-
LAY 1 AND ECM.
1) Turn ignition switch to OFF.
2) Disconnect connector from ECM.
3) Measure resistance of harness between
sub fan relay 1 connector and ECM con-
nector.
Connector & terminal
(F28) No. 27 — (B137) No. 28:
Is the measured value less than the speci-
fied value?
1
Ω
Repair open circuit
in harness
between sub fan
relay and ECM.
30
CHECK POOR CONTACT.
Check poor contact in connector between sub
fan and ECM.
Is there poor contact in connector between sub
fan motor and ECM?
There is poor contact.
Repair poor con-
tact connector.
Contact SUBARU
distributor service.
Step
Value
Yes
No
CO(H6DO)-20
COOLING
RADIATOR SUB FAN SYSTEM
31
CHECK HARNESS BETWEEN SUB FAN MO-
TOR CONNECTOR AND CHASSIS
GROUND.
1) Turn ignition switch to OFF.
2) Disconnect sub fan motor connector.
3) Turn A/C switch ON and set the tempera-
ture at the lowest position.
4) Perform checking procedure during coolant
temperature is 98 — 101
°
C (208 — 214
°
F).
5) Measure resistance of harness between
sub fan motor connector and chassis
ground.
Connector & terminal
(F16) No. 3 — Chassis ground:
Is the measured value less than the speci-
fied value?
5
Ω
32
CHECK POOR CONTACT.
Check poor contact in sub fan motor connec-
tor.
Is there poor contact in sub fan motor connec-
tor?
There is poor contact.
Repair poor con-
tact in sub fan
motor connector.
Replace sub fan
motor with a new
one.
33
CHECK HARNESS BETWEEN SUB FAN
AND FAN RELAY.
1) Disconnect fan relay connector.
2) Measure resistance between sub fan motor
connector and fan relay connector.
Connector & terminal
(F16) No. 3 — (B253) No. 5:
Is the measured value less than the speci-
fied value?
1
Ω
Repair open circuit
between sub fan
motor connector
and fan relay con-
nector.
34
CHECK POWER SUPPLY TO FAN RELAY.
1) Turn ignition switch to ON.
2) Measure voltage between fan relay termi-
nal and chassis ground.
Connector & terminal
(B253) No. 1 (+) — Chassis ground (
−−−−
):
Does the measured value exceed the spec-
ified value?
10 V
35
CHECK FUSE.
1) Turn ignition switch to OFF.
2) Remove fuse No. 17 from joint box.
3) Check condition of fuse.
Is the fuse blown-out?
Fuse is blown-out.
Replace fuse.
Repair open circuit
in harness
between fan relay
and ignition
switch.
36
CHECK FAN RELAY.
1) Turn ignition switch to OFF.
2) Remove fan relay.
3) Measure resistance of fan relay.
Terminal
No. 4 — No. 5:
Does the measured value exceed the spec-
ified value?
1 M
Ω
Replace fan relay.
37
CHECK FAN RELAY.
1) Connect battery to terminals No. 1 and No.
3 of fan relay.
2) Measure resistance of fan relay.
Terminal
No. 4 — No. 5:
Is the measured value less than the speci-
fied value?
1
Ω
Replace fan relay.
Step
Value
Yes
No
CO(H6DO)-21
COOLING
RADIATOR SUB FAN SYSTEM
NOTE:
Inspection by SUBARU distributor service is required, because probable cause is deterioration of multiple
parts.
38
CHECK HARNESS BETWEEN FAN RELAY
TERMINAL AND CHASSIS GROUND.
Measure resistance of harness between fan
relay connector and chassis ground.
Connector & terminal
(B253) No. 4 — Chassis ground:
Is the measured value less than the specified
value?
1
Ω
Repair open circuit
in harness
between fan relay
connector and
chassis ground.
39
CHECK HARNESS BETWEEN FAN RELAY
AND ECM.
1) Turn ignition switch to OFF.
2) Disconnect connector from ECM.
3) Measure resistance of harness between
fan relay connector and ECM connector.
Connector & terminal
(B253) No. 3 — (B137) No. 24:
Is the measured value less than the speci-
fied value?
1
Ω
Repair open circuit
in harness
between fan relay
connector and
ECM.
40
CHECK POOR CONTACT.
Check poor contact in connector between fan
relay and ECM.
Is there poor contact in connector between fan
relay and ECM?
There is poor contact.
Repair poor con-
tact connector.
Contact SUBARU
distributor service.
Step
Value
Yes
No
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст