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Home >> Subaru >> 2019 >> Ascent Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostics) (1 Of 4) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P0072: Ambient Air Temperature Sensor Circuit "A" Low >> Notes

DTC P0072: Ambient Air Temperature Sensor Circuit "A" Low: Notes

DTC detecting condition: 

Immediately at fault recognition

NOTE: After the faulty parts are repaired or replaced, perform the final check in Basic Diagnostic Procedure. Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE .
  1. CHECK DTC. 
    1. Turn the ignition switch to ON.
    2. Using the Subaru Select Monitor or a general scan tool, read the DTC of [Engine]. Ref. to COMMON (DIAG)>DIAGNOSTIC TROUBLE CODE (DTC) .

    Is P0072 or P0073 displayed? (Current malfunction)

    Yes  : Go to  2.

    No  : Even if DTC is detected, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.

    NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.
  2. CHECK COMBINATION METER. 

    Check the combination meter system. Ref. to COMBINATION METER (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE .

    Is the check result OK?

    Yes  : Repair the poor contact of ECM connector.

    No  : Repair the combination meter system. Ref. to COMBINATION METER (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE .