DTC U0073 Control Module Communication Bus Off: Trouble Symptom

CAN communication is not normal.

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK PERFORMING OF BASIC DIAGNOSTIC PROCEDURE.	Was the basic diagnostic procedure performed up to STEP 8?	Go to step 2.	Perform the basic diagnostic procedure. < Ref. to BASIC DIAGNOSTIC PROCEDURE . >
2 CHECK DTC. Start the engine. Using the Subaru Select Monitor, read DTC of CAN system.	Is U0073 a current malfunction?	Go to step 3.	It may be a temporary poor contact. Perform the clear memory.
3 CHECK CAN COMMUNICATION CIRCUIT. Check CAN communication circuit. < Ref. to PROCEDURE , CAN Communication Circuit Check. >	Is CAN communication circuit faulty?	Repair the faulty portion, following the diagnosis procedure.	Go to step 4.
4 CHECK DTC. Perform the inspection using the DTC check sheet. < Ref. to CHECK USING THE DTC CHECK SHEET , LIST, List of Diagnostic Trouble Code (DTC). > Using the Subaru Select Monitor, read DTC of CAN system.	Is U0073 a current malfunction?	Go to step 5.	System is normal.
5 CHECK CONTROL MODULE. Turn the ignition switch to OFF. Disconnect the control modules other than body integrated unit in order. NOTE: When disconnecting ECM or VDC CM, connect resistance of 120 Ω between CAN Hi and CAN Lo as an alternative of end resistance. Turn the ignition switch to ON. Using the Subaru Select Monitor, read DTC of CAN system.	Is there any control module that U0073 is not detected as current malfunction?	Replace the control module.	Repeat 1) to 4) in step 3 until U0073 is not detected.