Subaru Legacy BN/BS (2015-2019) Service Manual: General description

Dtc u0100 lost communication with ecm/pcm "a"

DTC DETECTING CONDITION:No data is received from ECM.TROUBLE SYMPTOM:Cooperation control of transmission may not operate properly.STEPCHECKYESNO1.CHECK PERFORMING OF BASIC DIAGNOSTIC PROCEDURE.Was the ...

Preparation tool

1. SPECIAL TOOLILLUSTRATIONTOOL NUMBERDESCRIPTIONREMARKS — (Newly adopted tool)SUBARU SELECT MONITOR 4Used for setting of each function and troubleshooting for electrical system.NOTE:For detailed op ...

Other materials:

Operation
1. GENERAL DESCRIPTIONFor on-board diagnosis function of the EyeSight, use the Subaru Select Monitor.The on-board diagnosis function operates in three categories, which are used depending on the type of problems.1. Diagnosis with diagnostic trouble code (DTC):When the electrical failure occurs in th ...