Subaru 2009 IMPREZA Service Manual page 1193

Step
28 CHECK GROUND CIRCUIT OF MAIN FAN
RELAY 2.
1) Remove main fan relay 2 from the relay
holder.
2) Measure the resistance between main fan
relay 2 terminal and chassis ground.
Connector & terminal
(F27) No. 19 — Chassis ground:
29 CHECK POWER SUPPLY TO MAIN FAN RE-
LAY 2.
1) Turn the ignition switch to ON.
2) Measure the voltage between main fan relay
2 terminal and chassis ground.
Connector & terminal
(F27) No. 20 (+) — Chassis ground (–):
30 CHECK MAIN FAN RELAY 2.
1) Turn the ignition switch to OFF.
2) Remove the main fan relay 2.
3) Measure the resistance of main fan relay 2.
Terminals
(F27) No. 18 — (F27) No. 19:
31 CHECK MAIN FAN RELAY 2.
1) Connect the battery to terminals No. 20 and
No. 22 of the main fan relay 2.
2) Measure the resistance of main fan relay 2.
Terminals
(F27) No. 18 — (F27) No. 19:
Radiator Fan System
Check
Is the resistance less than 1 ? Go to step 29.
Is the voltage 10 V or more?
Is the resistance 1 M or
more?
Is the resistance less than 1 ? Go to step 23.
CO(H4DOTC)-13
COOLING
Yes No
Repair the open
circuit of harness
between main fan
relay 2 and chassis
ground.
Go to step 30. Repair the power
supply line.
Go to step 31. Replace the main
fan relay 2.
Replace the main
fan relay 2.