Subaru 2009 IMPREZA Service Manual page 342

COOLING
B: INSPECTION
OPERATING CONDITION:
Vehicle speed
During acceleration: 19 km/h
(12 MPH) or less
During deceleration: 10 km/h
(6 MPH) or less
During acceleration: 20 — 69 km/h
(12 — 43 MPH)
During deceleration: 11 — 64 km/h
(7 — 40 MPH)
During acceleration: 70 — 134 km/h
(43 — 83 MPH)
During deceleration: 65 — 129 km/h
(40 — 80 MPH)
During acceleration: 135 km/h
(84 MPH) or more
During deceleration: 130 km/h
(81 MPH) or more
DIAGNOSIS:
Radiator main fan and radiator sub fans do not rotate under the above operating conditions.
Step
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
revolution OFF in this order.
• Subaru Select Monitor
Refer to "Compulsory Valve Operation Check
Mode" for detailed procedures. <Ref. to
EN(H4SO)(diag)-56, Compulsory Valve Opera-
tion Check Mode.>
Radiator Fan System
Increase: 95°C
A/C compressor (203°F) or less
load Decrease: 92°C
(198°F) or less
Radiator fan operation Radiator fan operation Radiator fan operation
OFF OFF
Low Low-Speed
High High-Speed
OFF OFF
Low High-Speed
High High-Speed
OFF OFF
Low OFF
High Low-Speed
OFF OFF
Low OFF
High OFF
Do the radiator main fans and
radiator sub fans rotate at low
speed?
high speed
CO(H4SO)-8
Engine coolant temperature
Increase: 96 — 99°C
(205 — 210°F)
Decrease: 93 — 94°C
(199 — 201°F)
Low-Speed
Low-Speed
High-Speed
Low-Speed
High-Speed
High-Speed
Low-Speed
Low-Speed
High-Speed
OFF
Low-Speed
Low-Speed
Check Yes
Go to step 2.
Increase: 100°C
(212°F) or more
Decrease: 95°C
(203°F) or more
High-Speed
High-Speed
High-Speed
High-Speed
High-Speed
High-Speed
High-Speed
High-Speed
High-Speed
High-Speed
High-Speed
High-Speed
No
Go to step 3.