Subaru Legacy IV (2008 year). Service manual — part 80
CO(H4SO)-6
General Description
COOLING
D: PREPARATION TOOL
1. SPECIAL TOOL
2. GENERAL TOOL
ILLUSTRATION
TOOL NUMBER
DESCRIPTION
REMARKS
499977100
CRANK PULLEY
WRENCH
Used to stop rotation of the crank pulley
when loosening or tightening crank pulley
bolts. (MT model)
499977400
CRANK PULLEY
WRENCH
Used to stop rotation of the crank pulley
when loosening or tightening crank pulley
bolts. (AT model)
18231AA010
CAM SPROCKET
WRENCH
• Used for removing and installing cam
sprocket.
• CAM SPROCKET WRENCH (499207100)
can also be used.
1B022XU0
SUBARU SELECT
MONITOR III KIT
Used for troubleshooting the electrical sys-
tem.
TOOL NAME
REMARKS
Radiator cap tester
Used for checking radiator and radiator cap.
ST-499977100
ST-499977400
ST18231AA010
ST1B022XU0
CO(H4SO)-7
Radiator Fan System
COOLING
2. Radiator Fan System
A: WIRING DIAGRAM
B136
F108
F16
B361
F17
F16
1
7
B360
1 2 3
4 5 6 7
8 9 10 11 12 13 14 15 16
F108
2 3
8
10
1
9
4
11 12 13 14 15 16
5 6 7
17 18
F27
B136
F36
F35
B143
F17
B361
1
7
2 3
4 5 6
8 9 10 11 12 13 14
F109
3 4
1 2
8 9 10 11
12 13 14 15 16 17 18 19 20 21 22 23 24
5
6 7
F27
1 2 3 4
5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20
1 2
3 4 5
6 7 8 9 10 11 12
3
1 2
7
4 5
6
16
7
1
2
22
19
18
11
12
20
21
10
13
E
E
M
2
1
M
2
F109
B360
10
1
SBF-6
MAIN SBF
No.3
No.22
No.26
18
29
B:
C:
E:
ECM
No.4
BATTERY
5
6
7 8
2
1
9
4
3
10
24
22 23
25
11 12 13 14 15
26 27
28
16
17 18 19 20 21
33 34
29
32
30
31
35
20 21 22
19
18
3 4 5
7
6
10 11
12
13
15
16
17
14
2
1
9
8
E6
E5
C10
B7
MAIN FAN
RELAY 1
MAIN
FUSE BOX
(M/B)
B143
B:
F35
C:
F36
E:
2 1
CO-02319
MAIN FAN
MOTOR
SUB FAN MOTOR
SUB
FAN
RELAY
MAIN
FAN
RELAY
THROUGH JOINT CONNECTOR
RELAY
HOLDER
IGNITION SWITCH
THROUGH JOINT
CONNECTOR
CO(H4SO)-8
Radiator Fan System
COOLING
B: INSPECTION
DETECTING CONDITION:
TROUBLE SYMPTOMS:
Radiator main fan and radiator sub fans do not rotate under the above operating conditions.
Vehicle speed
A/C compressor
load
Engine coolant temperature
Increase: 94°C (201°F)
or less
Decrease: 92°C
(198°F) or less
Increase: 95 — 99°C
(203 — 210°F)
Decrease: 93 — 94°C
(199 — 201°F)
Increase: 100°C
(212°F) or more
Decrease: 95°C
(203°F) or more
Radiator fan operation
Radiator fan operation
Radiator fan operation
During acceleration:
19 km/h (12 MPH) or less
During deceleration:
10 km/h (6 MPH) or less
OFF
OFF
Low-Speed
High-Speed
Low
Low-Speed
Low-Speed
High-Speed
High
High-Speed
High-Speed
High-Speed
During acceleration:
20 — 69 km/h (12 — 43 MPH)
During deceleration:
11 — 64 km/h (7 — 40 MPH)
OFF
OFF
Low-Speed
High-Speed
Low
High-Speed
High-Speed
High-Speed
High
High-Speed
High-Speed
High-Speed
During acceleration:
70 — 134 km/h (43 — 83 MPH)
During deceleration:
65 — 129 km/h (40 — 80 MPH)
OFF
OFF
Low-Speed
High-Speed
Low
OFF
Low-Speed
High-Speed
High
Low-Speed
High-Speed
High-Speed
During acceleration:
135 km/h (84 MPH) or more
During deceleration:
130 km/h (81 MPH) or more
OFF
OFF
OFF
High-Speed
Low
OFF
Low-Speed
High-Speed
High
OFF
Low-Speed
High-Speed
Step
Check
Yes
No
1
CHECK OPERATION OF RADIATOR FAN.
1) Connect the delivery (test) mode connector.
2) Turn the ignition switch to ON.
3) Using the Subaru Select Monitor, check the
forced operation of the radiator fan relay.
NOTE:
• When performing a forced operation radiator
fan relay check using the Subaru Select Moni-
tor, the radiator main fan and radiator sub fan
will repeat low speed revolution
o high speed
revolution
o OFF in this order.
• Subaru Select Monitor
Refer to “Compulsory Valve Operation Check
Mode” for detailed procedures. <Ref. to
EN(H4SO)(diag)-51, Compulsory Valve Opera-
tion Check Mode.>
Do the radiator main fans and
radiator sub fans rotate at low
speed?
Go to step 2.
Go to step 3.
CO(H4SO)-9
Radiator Fan System
COOLING
2
CHECK OPERATION OF RADIATOR FAN.
1) Connect the delivery (test) mode connector.
2) Turn the ignition switch to ON.
3) Using the Subaru Select Monitor, check the
forced operation of the radiator fan relay.
NOTE:
• When performing a forced operation radiator
fan relay check using the Subaru Select Moni-
tor, the radiator main fan and radiator sub fan
will repeat low speed revolution
o high speed
revolution
o OFF in this order.
• Subaru Select Monitor
Refer to “Compulsory Valve Operation Check
Mode” for detailed procedures. <Ref. to
EN(H4SO)(diag)-51, Compulsory Valve Opera-
tion Check Mode.>
Do the radiator main fans and
radiator sub fans rotate at high
speed?
Radiator main fan
system is normal.
Go to step 27.
3
CHECK POWER SUPPLY TO SUB FAN RE-
LAY.
1) Turn the ignition switch to OFF.
2) Remove the sub fan relay from the relay
holder.
3) Measure the voltage between the sub fan
relay terminal and chassis ground.
Connector & terminal
(F27) No. 10 (+) — Chassis ground (–):
Is the voltage 10 V or more?
Go to step 4.
Go to step 5.
4
CHECK POWER SUPPLY TO SUB FAN RE-
LAY.
1) Turn the ignition switch to ON.
2) Measure the voltage between the sub fan
relay terminal and chassis ground.
Connector & terminal
(F27) No. 13 (+) — Chassis ground (–):
Is the voltage 10 V or more?
Go to step 7.
Go to step 6.
5
CHECK FUSE.
1) Turn the ignition switch to OFF.
2) Remove the fuse No. 3.
3) Check the condition of fuse.
Is the fuse blown out?
Replace the fuse.
Repair the power
supply line.
6
CHECK FUSE.
1) Turn the ignition switch to OFF.
2) Remove the fuse No. 22.
3) Check the condition of fuse.
Is the fuse blown out?
Replace the fuse.
Repair the power
supply line.
7
CHECK SUB FAN RELAY.
1) Turn the ignition switch to OFF.
2) Measure the resistance between sub fan
relay terminals.
Terminals
No. 10 — No. 11:
Is the resistance 1 M
: or
more?
Go to step 8.
Replace the sub
fan relay. <Ref. to
AC-41, Relay and
Fuse.>
8
CHECK SUB FAN RELAY.
1) Connect the battery to terminals No. 13 and
No. 12 of the sub fan relay.
2) Measure the resistance between sub fan
relay terminals.
Terminals
No. 10 — No. 11:
Is the resistance less than 1
:? Go to step 9.
Replace the sub
fan relay. <Ref. to
AC-41, Relay and
Fuse.>
Step
Check
Yes
No
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