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Home >> Subaru >> 2011 >> Legacy Premium, Automatic CVT >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (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

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

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

JUDGMENT VALUE 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 > 22 °C (39.6°F)
Vehicle speed ≥ 20 km/h (12.4 MPH)

Time Needed for Diagnosis:  64 ms x 1 time(s) x 255 time(s)

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

Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.

JUDGMENT VALUE 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 ≤ 22 °C (39.6°F)

Time Needed for Diagnosis:  Less than 1 second