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Home >> Subaru >> 2021 >> Forester Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostics) (1 Of 4) >> Diagnostic Procedure With Diagnostic Trouble Code (DTC) >> DTC P0128: Coolant Thermostat (Engine Coolant Temperature Below Thermostat Regulating Temperature) >> General Description >> Execution Condition

Execution Condition

SECONDARY PARAMETERS AND EXECUTION CONDITION - DIAGNOSIS 1

Secondary parameters Execution condition
Battery voltage
Ambient air temperature
Engine coolant temperature at engine start
10.9 V or more
-7°C (19.4°F) or more
Less than 61°C (141.8°F)
SECONDARY PARAMETERS AND EXECUTION CONDITION - DIAGNOSIS 2

Secondary parameters Execution condition
Battery voltage
Ambient air temperature
Engine coolant temperature at engine start
10.9 V or more
-7°C (19.4°F) or more
Less than 61°C (141.8°F)
SECONDARY PARAMETERS AND EXECUTION CONDITION - DIAGNOSIS 3

Secondary parameters Execution condition
Battery voltage
Ambient air temperature
Actual engine coolant temperature
Diagnosis mask condition
10.9 V or more
-7°C (19.4°F) or more
Value of Mapl experienced
Not established
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)) 72 (161.6) 78.9 (174) 78.9 (174) 78.9 (174)