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Home >> Subaru >> 2017 >> Forester 2.0XT Touring >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Control System (Diagnostics) (P000A To P015B) (H4DOTC) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P0128 Coolant Thermostat (Engine Coolant Temperature Below Thermostat Regulating Temperature) >> Execution Condition

Execution Condition

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 1 SPECIFICATION

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 (159.1) 78.1 (172.6) 78.1 (172.6) 78.1 (172.6)
MAP 2 SPECIFICATION

Engine coolant temperature at engine starting °C (°F) -7 (19.4) 10 (50) 25 (77) 31.8 (89.2)
Estimated coolant temperature °C (°F) 55 (131) 65.1 (149.2) 74 (165.2) 78.1 (172.6)