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Home >> Subaru >> 2015 >> WRX Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Diagnostic Trouble Code (DTC) Detecting Criteria (H4DOTC) (Except STI) >> Diagnostic Trouble Code (DTC) Detecting Criteria >> DTC P0071 Ambient Temperature Sensor Circuit "A" Range/Performance >> Diagnostic Method

Diagnostic Method

Judge as NG when the following conditions are established.

Judgment Value 

JUDGMENT VALUE SPECIFICATION

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

Map 

Ambient air temperature °C (°F) -30 (-22) 30 (86) 45 (113) 60 (140)
Ambient air temperature 30 sec. after engine start - Intake air temperature 30 sec. after engine start °C (°F) 20 (36) 20 (36) 32 (57.6) 32 (57.6)

Time Needed for Diagnosis:  Less than 1 second

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