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Home >> Subaru >> 2021 >> Crosstrek Hybrid >> Repair and Diagnosis >> External Pages >> Different car >> Section 4 (Automatic Transaxle (Diagnostics) (IMPREZA)) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC U0401: Invalid Data Received From ECM/Pcm "A" >> General Description >> Diagnostic Method

Diagnostic Method

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If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment value 

JUDGMENT VALUE SPECIFICATIONS

Malfunction Criteria Threshold Value
CAN data from ECM Did not change

Time needed for diagnosis:  2 s

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

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