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Home >> Subaru >> 2021 >> Forester Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (Diagnostics) (4 Of 4) >> Diagnostic Procedure With Diagnostic Trouble Code (DTC) >> DTC U171F: Lost Lin Communication With Generator >> General Description >> Diagnostic Method

Diagnostic Method

Judge as NG when the following conditions are established.

JUDGMENT VALUE SPECIFICATION

Malfunction Criteria Threshold Value
Data received from control modules connected to LIN
or		 No change or
Checksum error
Internal malfunction flag of generator (communication failure warning) ON

Time needed for diagnosis:  2048ms

Malfunction indicator light illumination:  Does not illuminate even when malfunction occurs. (Charge warning light illuminates)

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