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DTC U0100: Lost Communication With ECM/Pcm "A"

DTC detecting condition: 

When no data was received from ECM for 5 seconds.

Trouble symptom: 

There is no effect on outer mirror Control Module function.

NOTE: Perform the diagnosis for LAN system and ECM. Refer to LAN SYSTEM (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE . Refer to ENGINE (DIAGNOSTICS) (H4DO)>Basic Diagnostic Procedure>PROCEDURE  . Refer to ENGINE (DIAGNOSTICS) (H4DOTC)>Basic Diagnostic Procedure>PROCEDURE  .
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