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Home >> Subaru >> 2020 >> Crosstrek Base, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 26 (Engine Control System (Diagnostics) (HEV) (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

WARNING: This page is about a different variant/trim than selected.

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

JUDGMENT VALUE SPECIFICATION

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

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