Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc u0002 can communication error

Subaru Legacy BN/BS (2015-2019) Service Manual / Hvac system (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc u0002 can communication error

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 U0002 CAN COMMUNICATION ERROR
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 U0002 detected-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0002 CAN COMMUNICATION ERROR	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.

Diagnostic procedure with diagnostic trouble code (dtc)

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Other materials:

Installation
1. Install the knock sensor to the cylinder block, and connect the connector to the knock sensor.NOTE:• Install the knock sensor connector so that the center of the connector is aligned with the extension line from the cylinder block rib (a).• Make sure that the knock sensor and its conn ...