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Home >> Subaru >> 2019 >> WRX STI >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (Diagnostics) (STI) (1 Of 4) >> Diagnostic Procedure With Diagnostic Trouble Code (DTC) >> 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 SPECIFICATION

Malfunction Criteria Threshold Value
|Engine coolant temperature at engine start - Intake air temperature when 21568 ms elapses after engine start| >Value from Map
| Engine coolant temperature at engine start - Ambient air temperature at engine start| >25°C (77°F)
TEMPERATURE SPECIFICATION - MAP

Ambient temperature (°C (°F)) -30 (-22) 30 (86) 45 (113) 60 (140)
| Engine coolant temperature at engine start - Intake air temperature when 21568 ms elapses after engine start | (°C (°F)) 12 (53.6) 12 (53.6) 22 (71.6) 22 (71.6)

Time needed for diagnosis:  Less than 1 second

Malfunction indicator light illumination:  Illuminates as soon as a malfunction occurs.