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Home >> Subaru >> 2015 >> WRX Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 249 (Continuously Variable Transmission (Diagnostics)) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC U0401: Invalid Data Received From ECM/Pcm "A" >> General Description >> Diagnostic Method

Diagnostic Method

WARNING: This page is about a different car, the 2022 Subaru WRX. However, it is still accessible from the selected car via links, so may be relevant.

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
CAN data from ECM Did not change

Time needed for diagnosis:  0.6 s

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

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