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Home >> Subaru >> 2018 >> WRX Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostics) (1 Of 4) (Except For STI) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P0071: Ambient Air Temperature Sensor Circuit "A" Range/Performance >> Diagnostic Method

Diagnostic Method

Judge as NG when the following conditions are established.

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)
INTAKE AIR TEMPERATURE SPECIFICATION - MAP

Intake air temperature
(°C (°F))
-30
(-22)
45
(113)
60
(140)
80
(176)
|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.