Subaru 2009 IMPREZA Service Manual page 768

Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
5. DIAGNOSTIC METHOD
• Abnormality Judgement
If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.
Judgement Value
Malfunction Criteria
Battery voltage
Estimate ambient temperature
Thermostat malfunction diagnosis
Engine coolant temperature at engine
starting
Estimated coolant temperature
Engine coolant temperature
(Estimated – Measured) Engine coolant
temperature
Vehicle speed
Time Needed for Diagnosis: 64 ms × 3 time(s) × 152 time(s)
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cy-
cles.
• Normality Judgement
Judge as OK and clear the NG if the continuous time while the following conditions are established is more
than the predetermined time.
Judgement Value
Malfunction Criteria
Battery voltage
Estimate ambient temperature
Thermostat malfunction diagnosis
Engine coolant temperature at engine
starting
Engine coolant temperature
(Estimated – Measured) Engine coolant
temperature
Time Needed for Diagnosis: Less than 1 second
Threshold Value
10.9 V
–7 °C (19.4 °F)
Incomplete
< 55 °C (131 °F)
75 °C (167 °F)
75 °C (167 °F)
> 30 °C (86 °F)
30 km/h (18.6 MPH)
Threshold Value
10.9 V
–7 °C (19.4 °F)
Incomplete
< 55 °C (131 °F)
75 °C (167 °F)
30 °C (86 °F)
GD(H4SO)-44