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Home >> Subaru >> 2006 >> Legacy GT spec.B >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 15 (Diagnostic Trouble Code (DTC) Detecting Criteria (H4SO)) >> Diagnostic Trouble Code (DTC) Detecting Criteria >> DTC P0128 Coolant Thermostat (Engine Coolant Temperature Below Thermostat Regulating Temperature) >> Diagnostic Method

Diagnostic Method

WARNING: This page is about a different variant/trim than selected.

Abnormality Judgment 

Judge as NG when the continuous time of completing the malfunction criteria below becomes 30 seconds or more.

Judgment Value 

JUDGMENT VALUE CHART

Malfunction Criteria Threshold Value
Battery voltage ≥ 10.9 V
Engine coolant temperature at engine starting < 55°C (131°F)
Engine coolant temperature < 75°C (167°F)
(Estimated - measured) Engine coolant temperature > 30°C (54°F)
Vehicle speed ≥ 30km/h(18.6MPH)
Estimated coolant temperature ≥ 75°C (167°F)
Estimate ambient temperature ≥ -7°C (19°F)

Time Needed for Diagnosis:  Not fixed

Malfunction Indicator Light Illumination:  Illuminates when malfunction occurs in 2 continuous driving cycles.

Normality Judgment 

Judge as OK and clear the NG when the malfunction criteria below are met.

Judgment Value 

JUDGMENT VALUE CHART

Malfunction Criteria Threshold Value
Battery voltage ≥ 10.9 V
Engine coolant temperature at engine starting < 55°C (131°F)
Engine coolant temperature ≥ 75°C (167°F)
(Estimated - measured) Engine coolant temperature ≤ 30°C (54°F)