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Home >> Subaru >> 2017 >> Forester 2.0XT Touring >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 16 (Engine Control System (Diagnostics) (P000A To P015B) (H4DO)) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P0071 Ambient Air Temperature Sensor Circuit "A" Range/Performance >> 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
|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 (77°F)
MAP SPECIFICATION

Intake air temperature °C (°F) -30 (-22) 45 (86) 60 (113) 80 (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 as soon as a malfunction occurs.