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Home >> Subaru >> 2017 >> Forester 2.0XT Touring >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 16 (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 ≥ 30km/h (18.6MPH)
Estimated coolant temperature > Value of Map 1
Engine coolant temperature at engine start < 61°C (141.8°F)
<Judgment 2>  
Battery voltage ≥ 10.9 V
Ambient air temperature ≥ -7°C (19.4°F)
Vehicle speed ≥ 30km/h (18.6MPH)
Estimated coolant temperature > Value of Map 2
Engine coolant temperature at engine start < 61°C (141.8°F)
<Judgment 3>  
Battery voltage ≥ 10.9 V
Ambient air temperature ≥ -7°C (19.4°F)
Vehicle speed ≥ 30km/h (18.6MPH)
Estimated coolant temperature ≥ Value of Map 3
Engine coolant temperature at engine start < 61°C (141.8°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) 60 (140) 60 (140) 60 (140) 60 (140)
MAP 2 SPECIFICATION

Engine coolant temperature at engine starting °C (°F) -7 (19.4) 8 (46.4) 10 (50) 25 (77)
Estimated coolant temperature °C (°F) 72.3 (162.1) 78.5 (173.3) 78.5 (173.3) 78.5 (173.3)
MAP 3 SPECIFICATION

Engine coolant temperature at engine starting °C (°F) -7 (19.4) 10 (50) 25 (77) 28.5 (83.3)
Estimated coolant temperature °C (°F) 43 (109.4) 60 (140) 75 (167) 78.5 (173.3)