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Home >> Subaru >> 2006 >> Legacy GT spec.B >> Repair and Diagnosis >> External Pages >> Different car >> Section 66 (Diagnostic Trouble Code (DTC) Detecting Criteria (H6DO)) >> Diagnostic Trouble Code (DTC) Detecting Criteria >> DTC P0128 Coolant Thermostat (Engine Coolant Temperature Below Thermostat Regulating Temperature) >> Diagnostic Method

Diagnostic Method

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Judge as NG when the continuous time of completing the malfunction criteria below becomes 23 seconds or more.

Judgment Value 

JUDGMENT VALUE REFERENCE CHART

Malfunction Criteria Threshold Value
Battery voltage ≥ 10.9 V
Estimate ambient temperature ≥-7°C(19.4°F)
Thermostat malfunction diagnosis Incomplete
Engine coolant temperature at engine starting <55°C(131°F)
Estimated coolant temperature ≥75°C(167°F)
Engine coolant temperature ≤75°C(167°F)
(Estimated - measured) Engine coolant temperature > 20°C (36°F)
Vehicle speed ≥20km/h (12MPH)

Time Needed for Diagnosis:  23 seconds

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

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

Judgment Value 

JUDGMENT VALUE REFERENCE CHART

Malfunction Criteria Threshold Value
Battery voltage ≥ 10.9 V
Estimate ambient temperature ≥-7°C(19.4°F)
Thermostat malfunction diagnosis Incomplete
Engine coolant temperature at engine starting <55°C(131°F)
Engine coolant temperature ≥75°C(167°F)
(Estimated - measured) Engine coolant temperature ≤20°C (36°F)