Subaru IMPREZA GD 2007 Series Manual page 2234

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Diagnostic Trouble Code (DTC) Detecting Criteria
BX:DTC P0483 FAN RATIONALITY CHECK
1. OUTLINE OF DIAGNOSIS
Detect the function abnormality of the radiator fan.
Judge as NG when the engine coolant temperature slowly decreases even when the radiator fan is rotating.
2. ENABLE CONDITION
Diagnostic enable condition is established if the radiator fan changes from OFF → ON when all of the con-
ditions below are met.
When one of the conditions below is not met, the diagnostic enable condition is not established.
Secondary Parameters
Engine speed
Idle switch
Vehicle speed
Battery voltage
3. GENERAL DRIVING CYCLE
Perform the diagnosis continuously when the radiator fan changes from OFF → ON when idling.
4. DIAGNOSTIC METHOD
Abnormality Judgment
Judge as NG when the continuous time of meeting the malfunction criteria below becomes 5 minutes or
more.
Judgment Value
Malfunction Criteria
Engine coolant temperature
Radiator fan
Engine coolant temperature
(A) engine coolant temperature °C (°F)
Time Needed for Diagnosis: 5 minutes
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in two continuous driving
cycles.
Enable Conditions
550 — 950 rpm
ON
0
≥ 10.9 V
Threshold Value
≥ 96°C (204.8°F)
OFF → ON
Does not decrease
(A)
0
0
(B)
(B) A/D value (V)
GD(STI)-167
GENERAL DESCRIPTION
EN-01737