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Subaru Legacy (2005 year). Manual - part 294

CO(H4DOTC)-7

COOLING

General Description

D: PREPARATION TOOL

ILLUSTRATION

TOOL NUMBER

DESCRIPTION

REMARKS

499977400

CRANK PULLEY
WRENCH

Used for stopping rotation of crank pulley when
loosening and tightening crank pulley bolts.

499977500

CAM SPROCKET
WRENCH

Used for removing and installing the intake and
exhaust camshaft sprocket.

ST-499977400

ST-499977500

CO(H4DOTC)-8

COOLING

Radiator Fan System

2. Radiator Fan System

A: WIRING DIAGRAM

CO-02151

B135

F108

F16

B361

F17

F16

2 1

1
7

B360

1 2 3

4 5 6 7

8 9 10 11 12 13 14 15 16

F108

2 3

1
9

11 12 13 14 15 16

5 6 7

17 18

F27

13
14
15

16 17

24 25

20 21

22
23

30
31

8 9

10
11
12

1
2

B135

F36

F35

B143

10 11 12 13 14 15

17 18 19

20
28

21 22 23

26 27

34 35

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

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

1 2

4 5

C10

C11

F109

B360

SBF-6

MAIN SBF

No.3

No.2

No.22

No.26

B143

F35

F36

B25

B24

ECM

IGNITION
SWITCH

MAIN FUSE BOX (M/B)

MAIN
FAN
RELAY 1

MAIN
FAN
RELAY 2

SUB
FAN
RELAY

A/C RELAY HOLDER

THROUGH JOINT
CONNECTOR

MAIN FAN
MOTOR

SUB FAN MOTOR

CO(H4DOTC)-9

COOLING

Radiator Fan System

B: INSPECTION

DETECTING CONDITION:
• Engine coolant temperature is more than 96

°C (205°F).

• Vehicle speed is below 19 km/h (12 MPH).
TROUBLE SYMPTOMS:
Radiator main and sub fan do not rotate under the above conditions.

Step

Check

Yes

CHECK OPERATION OF RADIATOR FAN.
1) Connect the test mode connector.
2) Turn the ignition switch to ON.
3) Perform the compulsory operation check for
the radiator fan relay using Subaru Select
Monitor.

NOTE:

• When performing the compulsory operation
check for the radiator fan relay using Subaru
Select Monitor, the radiator main fan and sub
fan will repeat such a operation as low speed
revolution

→ high speed revolution → OFF in

this order.
• Subaru Select Monitor
Refer to Compulsory Valve Operation Check
Mode for more operation procedure. <Ref. to
EN(H4DOTC)(diag)-38, Compulsory Valve
Operation Check Mode.>

Do the radiator main fan and
sub fan rotate at low speed?

Go to step 2.

Go to step 3.

NOTE:

• When performing the compulsory operation
check for the radiator fan relay using Subaru
Select Monitor, the radiator main fan and sub
fan will repeat such a operation as low speed
revolution

→ high speed revolution → OFF in

this order.
• Subaru Select Monitor
Refer to Compulsory Valve Operation Check
Mode for more operation procedure. <Ref. to
EN(H4DOTC)(diag)-38, Compulsory Valve
Operation Check Mode.>

Do the radiator main fan and
sub fan rotate at high speed?

Radiator fan sys-
tem is normal.

Go to step 27.

CHECK POWER SUPPLY TO SUB FAN RE-
LAY.
1) Turn the ignition switch to OFF.
2) Remove the sub fan relay from A/C relay
holder.
3) Measure the voltage between sub fan relay
terminal and chassis ground.

Connector & terminal

(F27) No. 20 (+) — Chassis ground (

−

Is the voltage more than 10 V? Go to step 4.

Go to step 5.

CHECK POWER SUPPLY TO SUB FAN RE-
LAY.
1) Turn the ignition switch to ON.
2) Measure the voltage between sub fan relay
terminal and chassis ground.

Connector & terminal

(F27) No. 23 (+) — Chassis ground (

−

Is the voltage more than 10 V? Go to step 7.

Go to step 6.

CO(H4DOTC)-10

COOLING

Radiator Fan System

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.

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.

CHECK SUB FAN RELAY.
1) Turn the ignition switch to OFF.
2) Measure the resistance between sub fan
relay terminals.

Terminals

No. 20 — No. 21:

Is the resistance more than 1
M

Ω?

Go to step 8.

Replace the sub
fan relay.

CHECK SUB FAN RELAY.
1) Connect the terminals No. 22 and No. 23 of
sub fan relay to battery.
2) Measure the resistance between sub fan
relay terminals.

Terminals

No. 20 — No. 21:

Is the resistance less than 1
Ω?

Go to step 9.

Replace the sub
fan relay.

CHECK HARNESS BETWEEN SUB FAN RE-
LAY TERMINAL AND SUB FAN MOTOR
CONNECTOR.
1) Disconnect the connector from sub fan
motor.
2) Measure the resistance of harness
between sub fan relay terminal and sub fan
motor connector.

Connector & terminal

(F16) No. 2 — (F27) No. 21:

Is the resistance less than 1
Ω?

Go to step 10.

Repair the open
circuit of harness
between sub fan
relay terminal and
sub fan motor con-
nector.

CHECK HARNESS BETWEEN SUB FAN MO-
TOR CONNECTOR AND MAIN FAN RELAY 2
CONNECTOR.
1) Remove the main fan relay 2 from A/C relay
holder.
2) Measure the resistance of harness
between sub fan motor connector and main fan
relay 2 connector.

Connector & terminal

(F16) No. 1 — (F27) No. 5:

Is the resistance less than 1
Ω?

Go to step 11.

Repair the open
circuit of harness
between sub fan
motor connector
and main fan relay
2 connector.

CHECK POOR CONTACT.
Check the poor contact in sub fan motor con-
nector.

Is there poor contact in sub fan
motor connector?

Repair the poor
contact in sub fan
motor connector.

Go to step 12.

CHECK SUB FAN MOTOR.
Connect the battery positive (+) terminal to ter-
minal No. 2 of sub fan motor, and the ground (

−

) terminal to terminal No. 1.