Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc u0073 control module communication bus off

Subaru Legacy BN/BS (2015-2019) Service Manual / Hvac system (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc u0073 control module communication bus off

DTC DETECTING CONDITION:

• Data to be received via CAN communication do not arrive.

• A/C cooperation control does not operate.

TROUBLE SYMPTOM:

A/C does not operate fully automatically.

STEP	CHECK	YES	NO
1.CHECK LAN SYSTEM. Check LAN system using the Subaru Select Monitor. Basic Diagnostic Procedure	Is there any fault-	Perform the diagnosis according to the inspection for LAN system.	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0073 CONTROL MODULE COMMUNICATION BUS OFF
2.CHECK A/C CM. 1) Replace with a normally operating A/C CM. 2) Read the DTC using Subaru Select Monitor. Read Diagnostic Trouble Code (DTC)	Is U0073 detected-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0073 CONTROL MODULE COMMUNICATION BUS OFF	Replace the A/C CM. Control Unit > REMOVAL
3.CHECK CAN COMMUNICATION CIRCUIT. Check the CAN communication circuit. CAN Communication Circuit Check > LIST	Is the CAN communication circuit normal-	It is possible that temporary poor communication occurs. Clear the memory. Clear Memory Mode	Repair or replace the CAN communication circuit.

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Other materials:

Installation
1. Clean the mating surface of valve cover and transmission side.CAUTION:When cleaning the mating surface of the transmission side, be careful not to allow any dust, foreign matter and used liquid gasket to enter the transmission.2. Check the control valve body for dust and other foreign matter.3. I ...