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Home >> Subaru >> 2021 >> Crosstrek Limited >> Repair and Diagnosis (Single Page) >> Brakes >> Anti-Lock Brakes >> Electric Brake Booster System (Diagnostics) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC U1100 Lost Communication With ECM/Pcm PU-Can >> General Description >> Diagnostic Method

Diagnostic Method

Communication Status with ECM is invalid or Communication Status with ECM Valid to Invalid edge is detected.

JUDGMENT VALUE SPECIFICATION

Malfunction Criteria Threshold Value
Case 1 
Communication Status with ECM
Invalid
Case 2 
(Communication Status with ECM Valid to Invalid edge
Detected
for time) 5.00 sec or more

Time needed for diagnosis: 

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