CO(w/o STI)-9
Radiator Fan System
COOLING
DIAGNOSIS:
Radiator main fan and radiator sub fans do not rotate under the above operating conditions.
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) Perform the compulsory operation check for
the radiator fan relay using Subaru Select Mon-
itor.
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 → high speed
revolution → OFF in this order.
• Subaru Select Monitor
Refer to “Compulsory Valve Operation Check
Mode” for detailed procedures. <Ref. to
EN(H4DOTC)(diag)-64, Compulsory Valve Op-
eration Check Mode.>
Do the radiator main fans and
radiator sub fans rotate at low
speed?
Go to step
2.
Go to step
3.
2
CHECK OPERATION OF RADIATOR FAN.
1) Connect the delivery (test) mode connector.
2) Turn the ignition switch to ON.
3) Perform the compulsory operation check for
the radiator fan relay using Subaru Select Mon-
itor.
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 → high speed
revolution → OFF in this order.
• Subaru Select Monitor
Refer to “Compulsory Valve Operation Check
Mode” for detailed procedures. <Ref. to
EN(H4DOTC)(diag)-64, Compulsory Valve Op-
eration 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 sub fan relay
connector 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 sub fan relay
connector 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.