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Home >> Subaru >> 2019 >> WRX STI Limited >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 19 (Engine Control System (Diagnostics) (Except For STI) (1 Of 4)) >> 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 > 60°C (140°F)
Engine coolant temperature at engine start < 60°C (140°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 1
Engine coolant temperature at engine start < 60°C (140°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 of Map 2
Engine coolant temperature at engine start < 60°C (140°F)
MAP SPECIFICATION 1

Engine coolant temperature at engine starting (°C (°F)) -7 (19.4) 8 (46.4) 10 (50) 25 (77)
Estimated coolant temperature (°C (°F)) 70.6 (49.1) 78.1 (63.3) 78.1 (172.6) 78.1 (172.6)
MAP SPECIFICATION 2

Engine coolant temperature at engine starting (°C (°F)) -7 (19.4) 10 (50) 25 (77) 31.8 (89.2)
Estimated coolant temperature (°C (°F)) 49.1 (120) 63.3 (146) 74 (165.2) 78.1 (172.6)