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:

Inspection
1. Check the continuity between the connectors.Preparation tool:Circuit testerTerminal No.Inspection conditionsSpecification4 (COM) — 5 (GND)AlwaysContinuity exists7 (SSW1) — 5 (GND)Push button ignition switch released > pressedContinuity exists2 (SSW2) — 5 (GND)Push button ignition switch rel ...