Radiator Fan System - Subaru Legacy 2004 Service Manual

COOLING
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
1 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(H4SO 2.0)(diag)-39, Compulsory Valve
Operation Check Mode.> <Ref. to EN(H4SO
2.5)(diag)-42, Compulsory Valve Operation
Check Mode.>
2 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(H4SO 2.0)(diag)-39, Compulsory Valve
Operation Check Mode.> <Ref. to EN(H4SO
2.5)(diag)-42, Compulsory Valve Operation
Check Mode.>
3 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 (

Radiator Fan System

Check
Do the radiator main fan and
sub fan rotate at low speed?
Do the radiator main fan and
sub fan rotate at high speed?
Is the voltage more than 10 V? Go to step 4.
$
):
CO(H4SO 2.0)-8
Yes
Go to step 2. Go to step 3.
Radiator fan sys- Go to step 27.
tem is normal.
Go to step 5.
No