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Home >> Subaru >> 2021 >> Crosstrek Sport >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 24 (Engine Control System (HEV) (Diagnostics) (1 Of 4)) >> Diagnostic Procedure With Diagnostic Trouble Code (DTC) >> DTC P0128: Coolant Thermostat (Engine Coolant Temperature Below Thermostat Regulating Temperature) >> General Description >> Diagnostic Method

Diagnostic Method

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JUDGMENT VALUE SPECIFICATIONS

Malfunction Criteria Threshold Value
When any one of the followings is established:
< Judgment 1>
Actual engine coolant temperature Less than 50°C (122°F)
Σ (Estimated engine coolant temperature - actual engine coolant temperature) More than 1731.6°C (3116.9°F)
Estimated coolant temperature More than 50°C (122°F)
< Judgment 2>
Actual engine coolant temperature Less than value of Map1
Σ (Estimated engine coolant temperature - actual engine coolant temperature) More than 1731.6°C (3116.9°F)
Estimated coolant temperature More than value of Map2
< Judgment 3>
Actual engine coolant temperature Less than 50°C (122°F)
TEMPERATURE SPECIFICATIONS - MAP 1

Engine coolant temperature at engine starting (°C (°F)) -7 (19.4) 8 (46.4) 10 (50) 25 (77)
Threshold Value (°C (°F)) 72.7 (162.9) 78.6 (173.5) 78.6 (173.5) 78.6 (173.5)
TEMPERATURE SPECIFICATIONS - MAP 2

Estimate ambient temperature (°C (°F)) -7 (19.4) 8 (46.4) 10 (50) 25 (77)
Threshold Value (°C (°F)) 72.7 (162.9) 78.6 (173.5) 78.6 (173.5) 78.6 (173.5)

Time needed for diagnosis  :

Malfunction indicator light illumination:  Illuminates when malfunction occurs in 2 continuous driving cycles.