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Home >> Subaru >> 2015 >> WRX STI >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Diagnostic Trouble Code (DTC) Detecting Criteria (H4DOTC) (STI) >> Diagnostic Trouble Code (DTC) Detecting Criteria >> DTC P0116 Engine Coolant Temperature Sensor 1 Circuit Range/Performance >> Diagnostic Method

Diagnostic Method

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

Judgment Value 

JUDGMENT VALUE SPECIFICATION

Malfunction Criteria Threshold Value
Engine coolant temperature at engine start - Intake air temperature 30 sec. after engine start > Value from Map
Engine coolant temperature at engine start - Ambient air temperature at engine start > 25 °C (45°F)

Map 

TEMPERATURE RESISTANCE SPECIFICATION - MAP

Ambient air temperature
°C (°F)
-30 (-22) 30 (86) 45 (113) 60 (140)
Engine coolant temperature at engine start - Intake air temperature 30 sec. after engine start
°C (°F)
12 (21.6°F) 12 (21.6°F) 22 (39.6°F) 22 (39.6°F)

Time Needed for Diagnosis:  64 ms

Malfunction Indicator Light Illumination:  Illuminates when malfunction occurs in 2 continuous driving cycles.