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Home >> Subaru >> 2017 >> Legacy 3.6R Limited >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (Engine Control System (Diagnostics) (P000A To P015B) (H4DO)) >> 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 > Value of Map 1
Engine coolant temperature at engine start < 63 °C (145.4 °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 > Value of Map 2
Engine coolant temperature at engine start < 63 °C (145.4 °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 ≥ Value from Map 3
Engine coolant temperature at engine start < 63 °C (145.4 °F)

Map 1 

Engine coolant temperature at engine starting °C (°F) -7 (19.4) 8 (46.4) 10 (50) 25 (77)
Estimated coolant temperature °C (°F) 60 (140) 60 (140) 60 (140) 60 (140)

Map 2 

Engine coolant temperature at engine starting °C (°F) -7 (19.4) 8 (46.4) 10 (50) 25 (77)
Estimated coolant temperature °C (°F) 73.5 (164.3) 82.7 (180.9) 82.7 (180.9) 82.7 (180.9)

Map 3 

Engine coolant temperature at engine starting °C (°F) -7 (19.4) 10 (50) 25 (77) 33.5 (92.3)
Estimated coolant temperature °C (°F) 46 (114.8) 57 (134.6) 72 (161.6) 82.7 (180.9)