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Home >> Subaru >> 2017 >> Legacy 2.5i Limited >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 16 (Engine Control System (Diagnostics) (P000A To P015D) (H6DO)) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P0128: Coolant Thermostat (Engine Coolant Temperature Below Thermostat Regulating Temperature) >> Execution Condition

Execution Condition

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Secondary parameters Execution condition
<Judgment 1>
Battery voltage ≥ 10.9 V
Ambient air temperature ≥ -7 °C (19.4 °F)
Vehicle speed ≥ 30 km/h (18.6 MPH)
Estimated coolant temperature > 75 °C 167 °F
Engine coolant temperature at engine start < 68 °C (154.4 °F)
<Judgment 2>
Battery voltage ≥ 10.9 V
Ambient air temperature ≥ -7 °C (19.4 °F)
Vehicle speed ≥ 30 km/h (18.6 MPH)
Estimated coolant temperature > 85.5 °C 185.9 °F
Engine coolant temperature at engine start < 68 °C (154.4 °F)
<Judgment 3>
Battery voltage ≥ 10.9 V
Ambient air temperature ≥ -7 °C (19.4 °F)
Vehicle speed ≥ 30 km/h (18.6 MPH)
Estimated coolant temperature ≥ 61 °C (141.8 °F)
Engine coolant temperature at engine start < 68 °C (154.4 °F)